the all new . . . taco zone controls wiring guide€¦ · boiler control power relay 1 relay 2...
TRANSCRIPT
The All New . . .TACO ZONE CONTROLS WIRING GUIDE
Pages
Switching Relays – Single Zone Wiring 2 – 4
Switching Relays – Oil Boiler Wiring Safety Notice – 5
Switching Relays – NON EXP Connected Together with Priority 6 – 9
Switching Relays – EXP Connected Together with Priority 10 – 13
Switching Relays – Multiple Indirect Hot Water Heaters 14 – 15
Switching Relays – EXP Connected To Reset Controls (PC700, 702 & 705) 16 – 27
Zone Valve Controls – NON EXP Connected Together with Priority 28 – 32
Zone Valve Controls – EXP Connected Together with Priority 33 – 36
Zone Valve Controls – Connected To Reset Controls (PC700, 702 & 705) 37 – 44
Hydro Air Fan Controls (HAFC 101 & 201) 45 – 49
New Expandable Zone Control – Connected to Older Expandable Zone Control 50 – 51
Specialty Thermostat and Zone Valve Wiring 52 – 61
Radiant Mixing Block 62 – 63
X-Pump Block 64 – 66
iSeries Mixing Valves 67 – 68
Low Water Cutoffs and Electric Water Feeders 69 – 84
Aquastat Wiring 85 – 91
Instruction Sheets 92 – 104
Standard Terms and Definitions – 105
Zone Controls Cross Reference 106 – 107
Do it once.Do it right.
© Taco Catalog No. 100-92 Effective Date: August 1, 2010Supersedes Date: New
TACO Zone Control Product Information
Switching RelaysProduct No. DescriptionSR501-4 1 Zone Switching RelaySR501-HC-4 1 or 2 Zone Switching Relay, High Current CapacitySR501-OR-4 1 Zone Switching Relay with Outdoor ResetSR502-4 2 Zone Switching Relay with PrioritySR503-4 3 Zone Switching Relay with PrioritySR504-4 4 Zone Switching Relay with PrioritySR506-4 6 Zone Switching Relay with Priority
Expandable Switching Relays – Expandable to 120 Zones (20 Zoning Panels)Product No. DescriptionSR501-EXP-4 1 Zone Switching RelaySR503-EXP-4 3 Zone Switching Relay with PrioritySR504-EXP-4 4 Zone Switching Relay with PrioritySR506-EXP-4 6 Zone Switching Relay with Priority
Zone Valve ControlsProduct No. DescriptionZVC403-4 3 Zone Valve Control with PriorityZVC404-4 4 Zone Valve Control with PriorityZVC405-4 5 Zone Valve Control with PriorityZVC406-4 6 Zone Valve Control with Priority
Expandable Zone Valve Controls – Expandable to 120 Zones (20 Zoning Panels)Product No. DescriptionZVC404-EXP-4 4 Zone Valve Control with Priority ZVC406-EXP-4 6 Zone Valve Control with Priority
Add-On Power Controls (For use with all -EXP controls)Product No. DescriptionPC700 Boiler Reset ControlPC702 2-Stage Boiler Reset ControlPC705 Variable Speed Pump Injection Mixing Control
Fan ControlsProduct No. DescriptionHAFC101-4 Hydro Air Fan ControlHAFC201-4 Hydro Air Fan Control with Optional Time Delays
Do it once.Do it right.
2
SR50
1-4
Switc
hing
Rel
ay W
iring
TY
PIC
AL
WIR
ING
(CO
LD S
TA
RT
)
ON
E Z
ON
ESW
ITC
HIN
G R
ELA
Y
SR 5
01-4
FUSE
6 AM
P
POW
ER
ZO
NE
1
LED
IND
ICA
TORS
FUSE
6 AM
P
NH
34
45
66
N/O
N/O
N/C
N/C
CO
MC
OM
120
VAC
INPU
T
TT
CO
M
RW
24 VAC
TO: 1
20 V
AC
PO
WER
CIR
CU
LATO
R
JUM
PE
RTO
: TT
ON
BO
ILER
THER
MO
STA
T
TO: 1
20 V
AC
PO
WER
CIR
CU
LATO
R
TO: Z
CTO
: ZR
ALT
ERN
AT
IVE
WIR
ING
(TA
NK
LESS
CO
IL)
ON
E Z
ON
ESW
ITC
HIN
G R
ELA
Y
SR 5
01-4
FUSE
6 AM
P
POW
ER
ZO
NE
1
LED
IND
ICA
TORS
FUSE
6 AM
P
NH
34
45
66
N/O
N/O
N/C
N/C
CO
MC
OM
120
VAC
INPU
T
TT
CO
M
RW
24 VACTH
ERM
OST
AT
TO: 1
20 V
AC
PO
WER
CIR
CU
LATO
R
TO: T
T O
N B
OIL
ER
ALT
ERN
AT
IVE
WIR
ING
(24
VA
C P
OW
ERED
IN
PU
T S
IGN
AL)
NH
REM
OVE
JUM
PER.
DO
NO
T C
ON
NEC
T PO
WER
TO N
AN
D H
TER
MIN
ALS
.
* T
STA
T LI
GH
T W
ILL
GO
O
N A
ND
OFF
WIT
H 2
4 VA
C
SIG
NA
L. P
OW
ER L
IGH
T
WIL
L A
LWA
YS B
E O
FF.
ON
E Z
ON
ESW
ITC
HIN
G R
ELA
Y
SR 5
01-4
FUSE
6 AM
P
POW
ER *
ZO
NE
1 *
LED
IND
ICA
TORS
FUSE
6 AM
P
NH
34
45
66
N/O
N/O
N/C
N/C
CO
MC
OM
120
VAC
INPU
T
TT
CO
M
RW
24 VAC
24 V
AC
SIG
NA
L
No
te:
Wh
en u
sin
g A
lter
nat
ive
Wir
ing
dia
gram
, th
e bo
iler
op
er-
atin
g co
ntr
ol’s
ZC
ter
min
al w
ill
see
the
load
of
the
circ
ula
tor(
s).
Warn
ing
:W
hen
u
sin
g A
lter
nat
ive
Wir
ing
dia
gram
, w
irin
gin
stru
ctio
ns
mu
st b
e fo
llow
ed s
o p
ower
ori
gin
ates
fro
m t
he
boil
eraq
uas
tat.
Fai
lure
to
foll
ow t
hes
e w
irin
g in
stru
ctio
ns
may
res
ult
ina
seco
nd
ary
sou
rce
of p
ower
bei
ng
con
nec
ted
to
the
boil
er t
hat
may
act
ivat
e it
un
der
cert
ain
cir
cum
stan
ces,
cau
sin
g in
jury
or
deat
h.
3
AlternativeWiring
ONE ZONE HCSWITCHING RELAY
SR 501-HC-4
LEDINDICATORS
R W1
24 VAC THERMOSTAT
W2COM
24VAC
T T T
N H X1RELAY 2RELAY 1
120 VACINPUT
120 VACCIRCULATOR
X1X2 X2
N
ZR
ZC
HPOWER INPUT
(120 VAC)
POWER
RELAY 1
RELAY 2
ONE ZONE HCSWITCHING RELAY
SR 501-HC-4
LEDINDICATORS
R W1
24 VAC THERMOSTAT
W2COM
24VAC
T T T
N H X1RELAY 2RELAY 1
120 VACINPUT
POWERINPUT
(120 VAC)120 VAC
CIRCULATOR
X1X2 X2
N
H
BOILERCONTROL
POWER
RELAY 1
RELAY 2
TypicalWiring
SR501-HC-4 – One Zone Switching Relay with or without Boiler Enable
ONE ZONE HCSWITCHING RELAY
SR 501-HC-4
LEDINDICATORS
R W1
24 VAC THERMOSTAT
W2COM
24VAC
T T T
N H X1RELAY 2RELAY 1
120 VACINPUT
240 VACCIRCULATOR
X1X2 X2
N
H1
H2
ONE ZONE, NO BOILER ENABLE(CONTROL & CIRCULATOR SAME POWER SOURCE)
CONTROL POWERINPUT (120 VAC)
POWER
RELAY 1
RELAY 2
(240 VAC)
{{ONE ZONE HC
SWITCHING RELAY
SR 501-HC-4
LEDINDICATORS
R W1
24 VAC THERMOSTAT
W2COM
24VAC
T T T
N H X1RELAY 2RELAY 1
120 VACINPUT
240 VACCIRCULATOR
X1X2 X2
N
H1
H2
ONE ZONE, NO BOILER ENABLE(CONTROL & CIRCULATOR DIFFERENT POWER SOURCE)
H
POWER
RELAY 1
RELAY 2
CONTROL POWERINPUT (120 VAC)
(240 VAC)
{
{
ONE ZONE HCSWITCHING RELAY
SR 501-HC-4
LEDINDICATORS
R W1 W2COM
24VAC
T T T
N H X1RELAY 2RELAY 1
120 VACINPUT
CIRCULATOR #1(120 VAC)
X1X2 X2
N
TWO ZONE, NO BOILER ENABLE
H
CIRCULATOR #2(120 VAC)
THERMOSTAT #2(24 VAC)
THERMOSTAT #1(24 VAC)
POWERINPUT
(120 VAC)
POWER
RELAY 1
RELAY 2
NOTE: When using Alternative Wiring diagram, refer to important NOTEand WARNING in SR501-HC Instruction Sheet on page 91 of this booklet.
RELAY RATING: 1/3 HP (13.8 FLA, 82.8 LRA at 120 VAC)(6.9 FLA, 41.4 LRA at 240 VAC)
SR501-OR-4 – One Zone Switching Relay with Outdoor Reset
ONE ZONE INSTALLATIONW/O INDIRECT DHW
ONE ZONESWITCHING RELAY
WITH OUTDOOR RESET
SR 5
01-O
R-4
LEDINDICATORS
POWER
TSTAT
DHWOVERRIDE
BOILERRELAY
N H
INPUT120 VAC
ZONE 1120 VAC
N H
6AMP
X RBOILER TSTAT
W C R WDHW
OUTDOORSENSOR
SUPPLYSENSOR
XDESIGN OUTDOOR
TEMPERATUREFOR 180°F SUPPLY
TEMPERATURE
OFF
-30
-20
0-10 10
20
40
30
ON
SW1
OFF
SYSTEMCIRCULATOR(OPTIONAL)
N
H
POWERINPUT
(120 VAC)
24 VACTHERMOSTAT
BOILERCONTROL
OUTDOORSENSOR
BOILERSUPPLYSENSOR
POT1
ZONE VALVE INSTALLATIONW/O ZONE CONTROL, W/O INDIRECT DHW
ONE ZONESWITCHING RELAY
WITH OUTDOOR RESET
SR 5
01-O
R-4
LEDINDICATORS
POWER
TSTAT
DHWOVERRIDE
BOILERRELAY
N H
INPUT120 VAC
ZONE 1120 VAC
N H
6AMP
X RBOILER TSTAT
W C R WDHW
OUTDOORSENSOR
SUPPLYSENSOR
XDESIGN OUTDOOR
TEMPERATUREFOR 180°F SUPPLY
TEMPERATURE
OFF
-30
-20
0-10 10
20
40
30
ON
SW1
OFF
SYSTEMCIRCULATOR(OPTIONAL)
N
H
POWERINPUT
(120 VAC)
BOILERCONTROL
OUTDOORSENSOR
BOILERSUPPLYSENSOR
POT1
ZONE VALVEEND SWITCH(S)
THERMOSTATS(24VAC)
TRA
NSF
ORM
ER
24 VAC120 VACINPUT
MULTI-ZONE INSTALLATIONWITH ZONE CONTROL, W/O INDIRECT DHW
ONE ZONESWITCHING RELAY
WITH OUTDOOR RESET
SR 5
01-O
R-4
LEDINDICATORS
POWER
TSTAT
DHWOVERRIDE
BOILERRELAY
N H
INPUT120 VAC
ZONE 1120 VAC
N H
6AMP
X RBOILER TSTAT
W C R WDHW
OUTDOORSENSOR
SUPPLYSENSOR
XDESIGN OUTDOOR
TEMPERATUREFOR 180°F SUPPLY
TEMPERATURE
OFF
-30
-20
0-10 10
20
40
30
ON
SW1
OFF
SYSTEMCIRCULATOR(OPTIONAL)
N
H
POWERINPUT
(120 VAC)
BOILERCONTROL
OUTDOORSENSOR
BOILERSUPPLYSENSOR
POT1
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
EXISTINGZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
PUMP ENDSWITCH
FUSE
5 A
MP
ZONE 3 PUMPEND SWITCH
THERMOSTATS(24VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
POWER
LEDINDICATORS
ZONE 1 ZONE 2 ZONE 3ISOLATEDX X R W R W R W
END SWITCH THERMOSTATS PRIORITY
24 VAC ZONE VALVES PRIORITY
X X
ZONE 3PRIORITY
OFF
ONC C C
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO 3 WIREZONE VALVE
123
JUMPER3 & 4
TACO 3 WIREZONE VALVE
123
MULTI-ZONE INSTALLATIONWITH ZONE CONTROL, WITH INDIRECT DHW
ONE ZONESWITCHING RELAY
WITH OUTDOOR RESET
SR 5
01-O
R-4
LEDINDICATORS
POWER
TSTAT
DHWOVERRIDE
BOILERRELAY
N H
INPUT120 VAC
ZONE 1120 VAC
N H
6AMP
X RBOILER TSTAT
W C R WDHW
OUTDOORSENSOR
SUPPLYSENSOR
XDESIGN OUTDOOR
TEMPERATUREFOR 180°F SUPPLY
TEMPERATURE
OFF
-30
-20
0-10 10
20
40
30
ON
SW1
OFF
SYSTEMCIRCULATOR(OPTIONAL)
N
H
POWERINPUT
(120 VAC)
BOILERCONTROL
OUTDOORSENSOR
BOILERSUPPLYSENSOR
POT1
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
EXISTINGZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
PUMP ENDSWITCH
FUSE
5 A
MP
ZONE 3 PUMPEND SWITCH
THERMOSTATS(24VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
POWER
LEDINDICATORS
ZONE 1 ZONE 2 ZONE 3ISOLATEDX X R W R W R W
END SWITCH THERMOSTATS PRIORITY
24 VAC ZONE VALVES PRIORITY
X X
ZONE 3PRIORITY
OFF
ONC C C
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO 3 WIREZONE VALVE
123
JUMPER3 & 4
TACO 3 WIREZONE VALVE
123
DHWAQUASTATA
4
5
NOTE: Tankless coil has priority.
L1 L2 T T
LINE VOLTAGEOIL BURNER RELAY
CIRCULATORON BOILER
(IF ATTACHED)
B2
C1
B1ZR
HONEYWELL L8124OR EQUAL
120 VAC INPUT
C2
ZC
L1 L2
(NEUTRAL)(HOT)
CIRCUITBREAKER
CUSTOMEREMERGENCY
SWITCH
THERMALFUSE
(FIROMATIC)
SERVICESWITCH
LOWWATERCUTOFF
T
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
X X R W R W R W R WISOLATED
ENDSWITCH THERMOSTATS (24 VAC)
PRIORITY120 VACZR
H H N H N H N H N H N HZONE4
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
ZONE 4PRIORITY
OFF
ON
PRIORITY
24 VAC
COM
THERMOSTATS
T
6
Two Switching Relays Connected Together
BOILER
H
N
TT T
TT T
OUTPUTNOTUSED
120 VAC INPUT
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
X X R W R W R W R WISOLATED
ENDSWITCH THERMOSTATS (24 VAC)
PRIORITY120 VACZR
H H N H N H N H N H N HZONE4
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
ZONE 4PRIORITY
OFF
ON
PRIORITY
TO: "TT" ON BOILER
JUMPER
24 VAC
COM
DHWHEATER
CIRCULATOR
THERMOSTATS
120 VAC INPUT
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
SR 504-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
X X R W R W R W R WISOLATED
ENDSWITCH THERMOSTATS (24 VAC)
PRIORITY120 VACZR
H H N H N H N H N H N HZONE4
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
ZONE 4PRIORITY
OFF
ON
PRIORITY
JUMPER
24 VAC
COM
TO: "TT" ON BOILER
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
7
Priority Zoning Circulator Controlling Switching Relay
TO: "TT" ON BOILER
120 VAC INPUT
BOILER
H
N
MASTER
SLAVE
PRIORITYON
PRIORITYOFF
120 VACINPUT
SIX ZONE SWITCHING RELAY
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1 ZONE 2
ZONE 3 ZONE 4 ZONE 5 ZONE 6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5
THERMOSTATS
SR 506-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
X X R W R W R W R W R W R WISOLATED
ENDSWITCH THERMOSTATS (24 VAC)
PRIORITY120 VACZR
H H N H N H N H N H N H N H N HZONE6
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
ZONE 5
ZONE 6
LEDINDICATORS
ZONE 6PRIORITY
OFF
ON
PRIORITY
24 VAC
COM
REMOVEJUMPER
PPR
IORI
TY
24 VACOUTPUT
(OPTIONAL)
POW
ER IN H
(on)
MASTER
CIRC.ONPRIORITY
MASTER/SLAVESWITCH
R W X X R C
THERMO-STAT
ENDSWITCH
24 VACPOWER
N
PRIORITY ZONINGCIRCULATOR
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
8
Prio
rity
Zoni
ng C
ircul
ator
Con
trolli
ng 2
Swi
tchi
ng R
elay
s
IND
IREC
TW
ATE
R H
EATE
RA
QU
AST
AT
OR
THER
MO
STA
T
120
VAC
INPU
T
TO:
"TT"
ON
BO
ILER
H N
SLA
VE
120
VAC
INPU
T
REM
OVE
JUM
PER
MA
ST
ER
PRIO
RITY
ON
PPRIORITYPOWER IN
H
(on)
MA
STER
CIR
C.
ON
PRIO
RITY
MAS
TER/
SLAV
ESW
ITC
H
RW
XX
RC
THER
MO
-ST
AT
END
SWIT
CH
24 V
AC
POW
ER
N
PRIO
RIT
Y Z
ON
ING
CIR
CU
LATO
R
TT
T
120
VAC
INPU
T
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
Y
120
VAC
CIR
CU
LATO
RS
ZC
IN
PUT
120
VAC
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
Z
ON
E1 Z
ON
E2 Z
ON
E3
THER
MO
STA
TS
SR 5
04-4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
P
XX
RW
RW
RW
RW
ISO
LATE
DEN
DSW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
120
VAC
ZR
HH
NH
NH
NH
NH
NH
ZON
E4
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
ZO
NE
4PR
IORI
TY OFF
ON
PRIO
RITY
24 V
AC
COM
T
BO
ILE
R
SLA
VE RE
MO
VEJU
MPE
R
TT
T
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
Y
120
VAC
CIR
CU
LATO
RS
ZC
IN
PUT
120
VAC
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
Z
ON
E1 Z
ON
E2 Z
ON
E3
THER
MO
STA
TS
SR 5
04-4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
P
XX
RW
RW
RW
RW
ISO
LATE
DEN
DSW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
120
VAC
ZR
HH
NH
NH
NH
NH
NH
ZON
E4
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
ZO
NE
4PR
IORI
TY OFF
ON
PRIO
RITY
24 V
AC
COM
T
TO:
"TT"
ON
BO
ILER
PRIO
RITY
OFF
PRIO
RITY
OFF
24 V
AC
OU
TPU
T(O
PTIO
NA
L)
9
120
VA
C IN
PUT
TO:
"TT"
ON
BO
ILER
H N
SLA
VE
120
VA
C IN
PUT
REM
OVE
JUM
PER
MA
ST
ER
TT
T
120
VA
C IN
PUT
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
Y
120
VAC
CIR
CU
LATO
RS
ZC
IN
PUT
120
VAC
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
Z
ON
E1 Z
ON
E2 Z
ON
E3
THER
MO
STA
TS
SR 5
04-4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
P
XX
RW
RW
RW
RW
ISO
LATE
DEN
DSW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
120
VAC
ZR
HH
NH
NH
NH
NH
NH
ZON
E4
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
ZO
NE
4PR
IORI
TY OFF
ON
PRIO
RITY
24 V
AC
COM
T
BO
ILE
R
SLA
VE RE
MO
VEJU
MPE
R
TT
T
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
Y
120
VAC
CIR
CU
LATO
RS
ZC
IN
PUT
120
VAC
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
Z
ON
E1 Z
ON
E2 Z
ON
E3
THER
MO
STA
TS
SR 5
04-4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
P
XX
RW
RW
RW
RW
ISO
LATE
DEN
DSW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
120
VAC
ZR
HH
NH
NH
NH
NH
NH
ZON
E4
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
ZO
NE
4PR
IORI
TY OFF
ON
PRIO
RITY
24 V
AC
COM
T
ON
E Z
ON
ESW
ITC
HIN
G R
ELA
Y
SR 5
01-4
FUSE
6 AM
P
POW
ER
ZO
NE
1
LED
IND
ICA
TORS
FUSE
6 AM
P
NH
34
45
66
N/O
N/O
N/C
N/C
CO
MC
OM
120
VAC
INPU
T
TT
CO
M
RW
24 VAC
CIR
CU
LATO
R
JUM
PE
R
IND
IREC
TW
ATE
R H
EATE
RA
QU
AST
AT
OR
THER
MO
STA
T
PRIO
RITY
OFF
PRIO
RITY
OFF
SR50
1 Sw
itchi
ng R
elay
Con
trolli
ng 2
Swi
tchi
ng R
elay
s
SR501-EXP Switching Relay Controlling Another Switching Relay
120 VAC INPUT
TO: "TT"ON BOILER
BOILER
H
N
MASTER
TO: "TT" ON BOILER
POWER
ZONE 1
LEDINDICATORS
FUSE6 AMP
FUSE6 AMP
SR 501-EXP-4
POWERCONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORYPORT
DHW HEATERCIRCULATOR
HN/O N H120 VAC
CIRCULATORPRIMARYOUTPUT
N/CINPUT
120 VAC
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X WRX 1A 2CB24 VOLTS AC ONLY
C
SINGLE ZONEEXPANDABLE SWITCHING RELAY
120 VAC INPUT
SLAVEPRIORITY
OFF
SIX ZONE SWITCHING RELAY
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1 ZONE 2
ZONE 3 ZONE 4 ZONE 5 ZONE 6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5
THERMOSTATS
SR 506-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
X X R W R W R W R W R W R WISOLATED
ENDSWITCH THERMOSTATS (24 VAC)
PRIORITY120 VACZR
H H N H N H N H N H N H N H N HZONE6
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
ZONE 5
ZONE 6
LEDINDICATORS
ZONE 6PRIORITY
OFF
ON
PRIORITY
24 VAC
COM
REMOVEJUMPER
T
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
10
SR501-EXP Switching Relay Controlling a Zone Valve Control
TO BOILER AQUASTAT RELAY
BOILER
H
N
BOILER TURNS ON WHEN ANY ZONE VALVE OPENS.
120 VACINPUT
TO BOILER AQUASTAT RELAY
SLAVE
SYSTEM PUMP TURNS ON WHEN ANY ZONE VALVE OPENSEXCEPT WHEN THE DHW HEATER (SR501-EXP) CALLS.
MASTER
POWER
ZONE 1
LEDINDICATORS
FUSE6 AMP
FUSE6 AMP
SR 501-EXP-4
POWERCONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORYPORT
DHW HEATERCIRCULATOR
HN/O N H120 VAC
CIRCULATORPRIMARYOUTPUT
N/CINPUT
120 VAC
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X WRX 1A 2CB24 VOLTS AC ONLY
C
SINGLE ZONEEXPANDABLE SWITCHING RELAY
120 VAC INPUT
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406 – 4
SIX ZONEZONE VALVE CONTROL
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
POW
ER IN
24 V
AC
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
THERMOSTATS (24VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6ISOLATEDX X
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES PRIORITY
X X
ZONE 6PRIORITY
OFF
ON
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
FUSE5 AMP
R W
See NOTE 1
R W R W R WC C CR W CC
FUSE5 AMP
R W C
Powered from Transformer A Powered from Transformer B
A
B
Powered from Transformer A Powered from Transformer B
SYSTEMPUMP
TT T
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
PRIORITYON
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
11
12
2 Expandable Switching Relays Connected Together
120 VAC INPUT
BOILER
SWITCH SETTINGS
Master/Slave: SlavePriority Zone: OffReset/Normal: Normal
120 VAC INPUTH
N
SWITCH SETTINGSMaster/Slave: MasterPriority Zone: OnReset/Normal: Normal
TO: "TT" ON BOILER
DHWCIRCULATOR
SLAVE
MASTER
FOUR ZONEEXPANDABLE
SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
PRIMARY SYSTEMCIRCULATOR(OPTIONAL)
TO: "TT" ON BOILER WITH DHW "TT" INPUT
SIX ZONEEXPANDABLE SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5
THERMOSTATS
SR 506-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE6 ZONE6
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
ZONE 5
ZONE 6
LEDINDICATORS
T
T
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
See NOTE 1
See NOTE 1
3 Ex
pand
able
Swi
tchi
ng R
elay
s Co
nnec
ted
Toge
ther
120
VAC
INPU
T
BO
ILE
R
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: M
aste
rPr
iorit
y Z
one:
On
Rese
t/N
orm
al: N
orm
al
120
VAC
INPU
TH N
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: S
lave
Prio
rity
Zon
e: O
ffRe
set/
Nor
mal
: Nor
mal
TO:
"TT"
ON
BO
ILER
SLA
VE
MA
ST
ER
FOU
R Z
ON
EEX
PAN
DA
BLE
SWIT
CH
ING
REL
AY
POW
ERC
ON
TRO
LS
120
VAC
CIR
CU
LATO
RSZ
C
INPU
T12
0 VA
C
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E1 Z
ON
E2 Z
ON
E3
THER
MO
STA
TS
SR 5
04-E
XP-
4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
NET
EXPA
NSI
ON
MAI
NPR
IORI
TY
XX
XX
AB
CR
WC
RW
CR
WC
RW
C1
2
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
N/C
PRIM
ARY
120
VAC
ZR
HH
NH
NH
NH
NH
NH
NH
NH
SLA
VE
PR
IOR
ITY
ON
RE
SE
T
PR
IMA
RY
PU
MP
ON
PO
ST
PU
RG
E O
N
PR
IOR
ITY
PR
OTE
CT
ON
PU
MP
EX
ER
CIS
E O
N
30 S
EC
/2 W
K
MA
STE
R
OFF
OFF
OFF
OFF
OFF
NO
RM
AL
LOW
LIM
IT (Z
C) O
NO
FF
4 M
IN/2
4 H
OU
R
ZON
E4ZO
NE4
PRIO
RITY
AC
CES
SORY
PORT
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
TO:
"TT"
ON
BO
ILER
WIT
H
D
HW
"TT
" IN
PUT
SIX
ZO
NE
EXPA
ND
AB
LE S
WIT
CH
ING
REL
AY
POW
ERC
ON
TRO
LS
120
VAC
CIR
CU
LATO
RSZ
C
INPU
T12
0 VA
C
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E 5
ZON
E 6
ZON
E1 Z
ON
E2 Z
ON
E3 Z
ON
E4 Z
ON
E5
THER
MO
STA
TS
SR 5
06-E
XP-
4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
NET
EXPA
NSI
ON
MAI
NPR
IORI
TY
XX
XX
AB
CR
WC
RW
CR
WC
RW
CR
WC
RW
C1
2
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
N/C
PRIM
ARY
120
VAC
ZR
HH
NH
NH
NH
NH
NH
NH
NH
NH
NH
SLA
VE
PR
IOR
ITY
ON
RE
SE
T
PR
IMA
RY
PU
MP
ON
PO
ST
PU
RG
E O
N
PR
IOR
ITY
PR
OTE
CT
ON
PU
MP
EX
ER
CIS
E O
N
30 S
EC
/2 W
K
MA
STE
R
OFF
OFF
OFF
OFF
OFF
NO
RM
AL
LOW
LIM
IT (Z
C) O
NO
FF
4 M
IN/2
4 H
OU
R
ZON
E6ZO
NE6
PRIO
RITY
AC
CES
SORY
PORT
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
ZO
NE
5
ZO
NE
6
LED
IND
ICA
TORS
T
T
IND
IREC
TW
ATE
R H
EATE
RA
QU
AST
AT
OR
THER
MO
STA
T
FOU
R Z
ON
EEX
PAN
DA
BLE
SWIT
CH
ING
REL
AY
POW
ERC
ON
TRO
LS
120
VAC
CIR
CU
LATO
RSZ
C
INPU
T12
0 VA
C
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E1 Z
ON
E2 Z
ON
E3
THER
MO
STA
TS
SR 5
04-E
XP-
4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
NET
EXPA
NSI
ON
MAI
NPR
IORI
TY
XX
XX
AB
CR
WC
RW
CR
WC
RW
C1
2
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
N/C
PRIM
ARY
120
VAC
ZR
HH
NH
NH
NH
NH
NH
NH
NH
SLA
VE
PR
IOR
ITY
ON
RE
SE
T
PR
IMA
RY
PU
MP
ON
PO
ST
PU
RG
E O
N
PR
IOR
ITY
PR
OTE
CT
ON
PU
MP
EX
ER
CIS
E O
N
30 S
EC
/2 W
K
MA
STE
R
OFF
OFF
OFF
OFF
OFF
NO
RM
AL
LOW
LIM
IT (Z
C) O
NO
FF
4 M
IN/2
4 H
OU
R
ZON
E4ZO
NE4
PRIO
RITY
AC
CES
SORY
PORT
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
TSW
ITC
H S
ETTI
NG
SM
aste
r/Sl
ave:
Sla
vePr
iorit
y Z
one:
Off
Rese
t/N
orm
al: N
orm
alS
LAV
E
PRIM
ARY
SYS
TEM
CIR
CU
LATO
R(O
PTIO
NA
L)
DH
WC
IRC
ULA
TOR
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
See
NO
TE
1
See
NO
TE
1Se
e N
OT
E 1
13
120
VAC
INPU
T
TO:
"TT"
ON
BO
ILER
H N
SLA
VE
120
VAC
INPU
T
MA
ST
ER
TT
T
120
VAC
INPU
T
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
Y
120
VAC
CIR
CU
LATO
RS
ZC
IN
PUT
120
VAC
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
Z
ON
E1 Z
ON
E2 Z
ON
E3
THER
MO
STA
TS
SR 5
04-4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
P
XX
RW
RW
RW
RW
ISO
LATE
DEN
DSW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
120
VA
CZ
RH
HN
HN
HN
HN
HN
HZO
NE4
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
ZO
NE
4PR
IORI
TY OFF
ON
PRIO
RITY
24 V
AC
COM
BO
ILE
R
SLA
VE
ZO
NE
NO
TU
SED
TT
T
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
Y
120
VAC
CIR
CU
LATO
RS
ZC
IN
PUT
120
VAC
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
Z
ON
E1 Z
ON
E2 Z
ON
E3
THER
MO
STA
TS
SR 5
04-4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
P
XX
RW
RW
RW
RW
ISO
LATE
DEN
DSW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
120
VA
CZ
RH
HN
HN
HN
HN
HN
HZO
NE4
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
ZO
NE
4PR
IORI
TY OFF
ON
PRIO
RITY
24 V
AC
COM
IND
IREC
TW
ATE
R H
EATE
RA
QU
AST
AT
OR
THER
MO
STA
T
ZO
NE
NO
TU
SED
JUM
PER
JUM
PER
PRIO
RITY
ON
PRIO
RITY
ON
TWO
ZO
NE
SWIT
CH
ING
REL
AY
CIR
CU
LATO
RS
ZC
IN
PUT
120
VAC
ZON
E 1
ZON
E 2
PRIO
RITY
Z
ON
E1
ZO
NE2
PRIO
RITY
SR 5
02-4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
P
XX
RW
RW
ISO
LATE
DEN
DSW
ITC
HTH
ERM
OST
ATS
120
VA
C
ZR
HH
NH
NH
NH
ZO
NE
2
POW
ER
ZO
NE
1
LED
IND
ICA
TORS
ZO
NE
2PR
IORI
TY OFF
ON
JUM
PER
24 V
AC
COM
120
VAC
PRIO
RITY
OFF
IND
IREC
TW
ATE
R H
EATE
RA
QU
AST
AT
OR
THER
MO
STA
T
2 In
dire
ct W
ater
Hea
ters
with
Prio
rity
Conn
ecte
d to
Sta
ndar
d Sw
itchi
ng R
elay
s
14
15
TO:
"TT"
ON
BO
ILER
120
VAC
INPU
T
BO
ILE
R
IND
IREC
TW
ATE
R H
EATE
RA
QU
AST
AT
OR
THER
MO
STA
T
TWO
ZO
NE
SWIT
CH
ING
REL
AY
CIR
CU
LATO
RS
ZC
IN
PUT
120
VAC
ZON
E 1
ZON
E 2
PRIO
RITY
Z
ON
E1
ZO
NE2
PRIO
RITY
SR 5
02-4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
P
XX
RW
RW
ISO
LATE
DEN
DSW
ITC
HTH
ERM
OST
ATS
120
VAC
ZR
HH
NH
NH
NH
ZO
NE
2
POW
ER
ZO
NE
1
LED
IND
ICA
TORS
ZO
NE
2PR
IORI
TY OFF
ON
JUM
PER
24 V
AC
COM
DH
W C
IRC
ULA
TORS
PRIO
RITY
OFF
IND
IREC
TW
ATE
R H
EATE
RA
QU
AST
AT
OR
THER
MO
STA
T
120
VAC
INPU
T
H N
FOU
R Z
ON
EEX
PAN
DA
BLE
SWIT
CH
ING
REL
AY
POW
ERC
ON
TRO
LS
120
VAC
CIR
CU
LATO
RSZ
C
INPU
T12
0 V
AC
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZO
NE1
ZO
NE2
ZO
NE3
THER
MO
STA
TS
SR 5
04-E
XP-
4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
NET
EXPA
NSI
ON
MAI
NPR
IORI
TY
XX
XX
AB
CR
WC
RW
CR
WC
RW
C1
2
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
N/C
PRIM
ARY
120
VAC
ZR
HH
NH
NH
NH
NH
NH
NH
NH
SLA
VE
PR
IOR
ITY
ON
RE
SE
T
PR
IMA
RY
PU
MP
ON
PO
ST
PU
RG
E O
N
PR
IOR
ITY
PR
OTE
CT
ON
PU
MP
EX
ER
CIS
E O
N
30 S
EC
/2 W
K
MA
STE
R
OFF
OFF
OFF
OFF
OFF
NO
RM
AL
LOW
LIM
IT (Z
C) O
NO
FF
4 M
IN/2
4 H
OU
R
ZO
NE4
ZO
NE4
PRIO
RITY
AC
CES
SORY
PORT
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
T
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: M
aste
rPr
iorit
y Z
one:
On
Rese
t/N
orm
al: N
orm
alM
AS
TE
R
PRIM
ARY
SYS
TEM
CIR
CU
LATO
R(O
PTIO
NA
L)
ZO
NE
NO
TU
SED
FOU
R Z
ON
EEX
PAN
DA
BLE
SWIT
CH
ING
REL
AY
POW
ERC
ON
TRO
LS
120
VAC
CIR
CU
LATO
RSZ
C
INPU
T12
0 V
AC
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZO
NE1
ZO
NE2
ZO
NE3
THER
MO
STA
TS
SR 5
04-E
XP-
4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
NET
EXPA
NSI
ON
MAI
NPR
IORI
TY
XX
XX
AB
CR
WC
RW
CR
WC
RW
C1
2
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
N/C
PRIM
ARY
120
VAC
ZR
HH
NH
NH
NH
NH
NH
NH
NH
SLA
VE
PR
IOR
ITY
ON
RE
SE
T
PR
IMA
RY
PU
MP
ON
PO
ST
PU
RG
E O
N
PR
IOR
ITY
PR
OTE
CT
ON
PU
MP
EX
ER
CIS
E O
N
30 S
EC
/2 W
K
MA
STE
R
OFF
OFF
OFF
OFF
OFF
NO
RM
AL
LOW
LIM
IT (Z
C) O
NO
FF
4 M
IN/2
4 H
OU
R
ZO
NE4
ZO
NE4
PRIO
RITY
AC
CES
SORY
PORT
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
TSW
ITC
H S
ETTI
NG
SM
aste
r/Sl
ave:
Sla
vePr
iorit
y Z
one:
Off
Rese
t/N
orm
al: N
orm
alS
LAV
E
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
See
NO
TE
1
2 In
dire
ct W
ater
Hea
ters
with
Prio
rity
Conn
ecte
d to
EXP
Swi
tchi
ng R
elay
s
PC700 Boiler Reset Control Connected to SR501-EXP Switching Relay
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: Reset
SYSTEMCIRCULATOR
TO: "TT" ON BOILER
POWER
ZONE 1
LEDINDICATORS
FUSE6 AMP
FUSE6 AMP
SR 501-EXP-4
POWERCONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORYPORT
HN/O N H120 VAC
CIRCULATORPRIMARYOUTPUT
N/CINPUT
120 VAC
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X WRX 1A 2CB24 VOLTS AC ONLY
C
SINGLE ZONEEXPANDABLE SWITCHING RELAY
THERMOSTAT
T
120 VAC INPUTH
N
BOILER
To: DHW Aquastat if PC700Boiler Reset Temperature isto be overridden duringDHW call.
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
16
17
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VACINPUT
ZONE1 ZONE2
ZONE3
ZONE4
ZONE1 ZONE2 ZONE3 ZONE4
FUSE 1 AMP
24 V
AC
POW
ER
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
THERMOSTATS
BOILER
H
N
MASTEREXISTINGZONECONTROL
T
PRIMARYSYSTEM
CIRCULATOR(Optional)
TO: "TT" ON BOILER
JUMPER
DHWHEATER
CIRCULATOR
Note: If Zone Control comes on without a call for heat,reverse Reset Override input (1 & 2) wires on SR501-EXP.
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset
POWER
ZONE 1
LEDINDICATORS
FUSE6 AMP
FUSE6 AMP
SR 501-EXP-4
POWERCONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORYPORT
HN/O N H120 VAC
CIRCULATORPRIMARYOUTPUT
N/CINPUT
120 VAC
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X WRX 1A 2CB24 VOLTS AC ONLY
C
SINGLE ZONEEXPANDABLE SWITCHING RELAY
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
SR501-EXP and PC700 Boiler Reset Control Connected to an Existing Switching Relay
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VACINPUT
ZONE1 ZONE2
ZONE3
ZONE4
ZONE1 ZONE2 ZONE3 ZONE4
FUSE 1 AMP
24 V
AC
POW
ER
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
THERMOSTATS
BOILER
H
N
EXISTINGZONECONTROL
T
TO: "TT" ON BOILER
REMOVEJUMPER
DHWHEATER
CIRCULATOR
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
SLAVE
MASTER
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset
POWER
ZONE 1
LEDINDICATORS
FUSE6 AMP
FUSE6 AMP
SR 501-EXP-4
POWERCONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORYPORT
HN/O N H120 VAC
CIRCULATORPRIMARYOUTPUT
N/CINPUT
120 VAC
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X WRX 1A 2CB24 VOLTS AC ONLY
C
SINGLE ZONEEXPANDABLE SWITCHING RELAY
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
See NOTE 1
Connecting a DHW Heater to an Existing Heating Only Switching RelayUsing an SR501-EXP and PC700 Boiler Reset Control
SR501-EXP and PC700 Boiler Reset Control Connected to an Existing Zone Valve Control
120 VACINPUT
BOILER
H
N
EXISTINGZONECONTROL
TO: "TT" ON BOILER
DHW HEATERCIRCULATOR
Note: If Zone Control comes on without a call for heat,reverse Reset Override input (1 & 2) wires on SR501-EXP.
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
24 VAC
POWER IN
ZONE 2 ZONE 3 ZONE 4
MODENORMAL RESET
FUSE
(3 AM
P MA
X)
ZONE 1T T T T T T T T
ZONE 4PRIORITY
OFF
ON
N/O COM N/CZONE 4 RELAY 1 2 3 4 1 2 3 4
ZONE 1 ZONE 2
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
1 2 3 4ZONE 3
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
T STAT 1VALVE 1T STAT 2VALVE 2T STAT 3VALVE 3T STAT 4VALVE 4POWER
ENDSWITCH
EXTRAEND
SWITCH
MAIN
24VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZVC 404 FOUR ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
1 2 3 4ZONE 4
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
THERMOSTATS
T TT
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
ZONE VALVE SYSTEMCIRCULATOR
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
MASTER
PRIMARY SYSTEMCIRCULATOR
(Optional)
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset
POWER
ZONE 1
LEDINDICATORS
FUSE6 AMP
FUSE6 AMP
SR 501-EXP-4
POWERCONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORYPORT
HN/O N H120 VAC
CIRCULATORPRIMARYOUTPUT
N/CINPUT
120 VAC
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X WRX 1A 2CB24 VOLTS AC ONLY
C
SINGLE ZONEEXPANDABLE SWITCHING RELAY
Connecting a DHW Heater to an Existing Heating Only Zone Valve ControlUsing an SR501-EXP and PC700 Boiler Reset Control
120 VACINPUT
BOILER
H
N
EXISTINGZONECONTROL
DHW HEATERCIRCULATOR
TO: "TT" ON BOILER
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
24 VAC
POWER IN
ZONE 2 ZONE 3 ZONE 4
MODENORMAL RESET
FUSE
(3 AM
P MA
X)
ZONE 1T T T T T T T T
ZONE 4PRIORITY
OFF
ON
N/O COM N/CZONE 4 RELAY 1 2 3 4 1 2 3 4
ZONE 1 ZONE 2
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
1 2 3 4ZONE 3
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
T STAT 1VALVE 1T STAT 2VALVE 2T STAT 3VALVE 3T STAT 4VALVE 4POWER
ENDSWITCH
EXTRAEND
SWITCH
MAIN
24VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZVC 404 FOUR ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
1 2 3 4ZONE 4
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
THERMOSTATS
T TT
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.ZONE VALVE SYSTEM
CIRCULATOR
SLAVE
MASTER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: Reset
POWER
ZONE 1
LEDINDICATORS
FUSE6 AMP
FUSE6 AMP
SR 501-EXP-4
POWERCONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORYPORT
HN/O N H120 VAC
CIRCULATORPRIMARYOUTPUT
N/CINPUT
120 VAC
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X WRX 1A 2CB24 VOLTS AC ONLY
C
SINGLE ZONEEXPANDABLE SWITCHING RELAY
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
See NOTE 1
18
19
SR501-EXP and PC702 Boiler Reset Control Connected to an Existing Switching Relay
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VACINPUT
ZONE1 ZONE2
ZONE3
ZONE4
ZONE1 ZONE2 ZONE3 ZONE4
FUSE 1 AMP
24 V
AC
POW
ER
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
THERMOSTATS
H
N
MASTEREXISTINGZONECONTROL
T
PRIMARYSYSTEM
CIRCULATOR(Optional)
JUMPER
DHWHEATER
CIRCULATOR
Note: If Zone Control comes on without a call for heat,reverse Reset Override input (1 & 2) wires on SR501-EXP.
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset
POWER
ZONE 1
LEDINDICATORS
FUSE6 AMP
FUSE6 AMP
SR 501-EXP-4
POWERCONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORYPORT
HN/O N H120 VAC
CIRCULATORPRIMARYOUTPUT
N/CINPUT
120 VAC
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X WRX 1A 2CB24 VOLTS AC ONLY
C
SINGLE ZONEEXPANDABLE SWITCHING RELAY
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#2
BOILER#1
DHWDEMAND
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
SR501-EXP and PC705 Variable Speed Pump Injection Control Connectedto an Existing Switching Relay
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VACINPUT
ZONE1 ZONE2
ZONE3
ZONE4
ZONE1 ZONE2 ZONE3 ZONE4
FUSE 1 AMP
24 V
AC
POW
ER
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
THERMOSTATS
BOILER
H
N
EXISTINGZONECONTROL
T
TO: "TT" ON BOILER
SLAVE
MASTER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: Reset
POWER
ZONE 1
LEDINDICATORS
FUSE6 AMP
FUSE6 AMP
SR 501-EXP-4
POWERCONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORYPORT
HN/O N H120 VAC
CIRCULATORPRIMARYOUTPUT
N/CINPUT
120 VAC
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X WRX 1A 2CB24 VOLTS AC ONLY
C
SINGLE ZONEEXPANDABLE SWITCHING RELAY
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
(SEE NOTE BON PAGE 22)
PRIMARYSYSTEM
CIRCULATOR(Optional)
Note: If Zone Control comes on without a call for heat,reverse Reset Override input (1 & 2) wires on SR501-EXP.
JUMPER
ZONE
CONT
ROL
BOIL
SEN
OUT
SEN B
OIL
ER
SE
NS
OR
OU
TDO
OR
SE
NS
OR
PC
700
BO
ILE
R
120
VAC
INPU
T
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: M
aste
rPr
iorit
y Z
one:
On
or O
ffRe
set/
Nor
mal
: Res
et
FOU
R Z
ON
EEX
PAN
DA
BLE
SWIT
CH
ING
REL
AY
POW
ERC
ON
TRO
LS
120
VAC
CIR
CU
LATO
RSZ
C
INPU
T12
0 VA
C
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E1 Z
ON
E2 Z
ON
E3
THER
MO
STA
TS
SR 5
04-E
XP-
4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
NET
EXPA
NSI
ON
MAI
NPR
IORI
TY
XX
XX
AB
CR
WC
RW
CR
WC
RW
C1
2
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
N/C
PRIM
ARY
120
VAC
ZR
HH
NH
NH
NH
NH
NH
NH
NH
SLA
VE
PR
IOR
ITY
ON
RE
SE
T
PR
IMA
RY
PU
MP
ON
PO
ST
PU
RG
E O
N
PR
IOR
ITY
PR
OTE
CT
ON
PU
MP
EX
ER
CIS
E O
N
30 S
EC
/2 W
K
MA
STE
R
OFF
OFF
OFF
OFF
OFF
NO
RM
AL
LOW
LIM
IT (Z
C) O
NO
FF
4 M
IN/2
4 H
OU
R
ZON
E4ZO
NE4
PRIO
RITY
AC
CES
SORY
PORT
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
T
H N
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
PRIM
ARY
SYS
TEM
CIR
CU
LATO
R(O
PTIO
NA
L)
PC70
0 Bo
iler R
eset
Con
trol C
onne
cted
to E
XP S
witc
hing
Rel
ay
20
21
ZONE
CONT
ROL
BOIL
SEN
OUT
SEN
BO
ILE
R S
EN
SO
R
OU
TDO
OR
SE
NS
OR
PC
702
STAG
E1
STAG
E2
BO
ILE
R#2
BO
ILE
R#1
DH
WD
EM
AN
D
WIR
ING
NEE
DED
ON
LY IF
PRIO
RITY
ZO
NE
IS D
HW
PRIM
ARY
SYS
TEM
CIR
CU
LATO
R(O
PTIO
NA
L)
120
VAC
INPU
T
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: M
aste
rPr
iorit
y Z
one:
On
or O
ffRe
set/
Nor
mal
: Res
et
FOU
R Z
ON
EEX
PAN
DA
BLE
SWIT
CH
ING
REL
AY
POW
ERC
ON
TRO
LS
120
VAC
CIR
CU
LATO
RSZ
C
INPU
T12
0 VA
C
ZO
NE
1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E1 Z
ON
E2 Z
ON
E3
THER
MO
STA
TS
SR 5
04-E
XP-
4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
NET
EXPA
NSI
ON
MAI
NPR
IORI
TY
XX
XX
AB
CR
WC
RW
CR
WC
RW
C1
2
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
N/C
PRIM
ARY
120
VAC
ZR
HH
NH
NH
NH
NH
NH
NH
NH
SLA
VE
PR
IOR
ITY
ON
RE
SE
T
PR
IMA
RY
PU
MP
ON
PO
ST
PU
RG
E O
N
PR
IOR
ITY
PR
OTE
CT
ON
PU
MP
EX
ER
CIS
E O
N
30 S
EC
/2 W
K
MA
STE
R
OFF
OFF
OFF
OFF
OFF
NO
RM
AL
LOW
LIM
IT (Z
C) O
NO
FF
4 M
IN/2
4 H
OU
R
ZON
E4ZO
NE4
PRIO
RITY
AC
CES
SORY
PORT
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
T
H N
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
PC70
2 2–
Stag
e Bo
iler R
eset
Con
trol C
onne
cted
to E
XP S
witc
hing
Rel
ay
TO:
"TT"
ON
BO
ILER
BO
ILE
R
ZONE
CONT
ROL
BOIL
SEN
OUT
SEN
BO
ILE
R S
EN
SO
R
OU
TDO
OR
SE
NS
OR
PC
705-
2
SUP
SEN
SU
PP
LY S
EN
SO
R
INJE
CTI
ON
CIR
CU
LATO
R
SYST
EMA
ND
/OR
BOIL
ERC
IRC
ULA
TOR
BLA
CK
BLU
E
REDGRE
EN/G
ROU
ND
(SEE
NO
TE B
)
NO
TE A
: W
HEN
SYS
TEM
CIR
CU
LATO
R IS
CO
NN
ECTE
D T
O P
RIM
ARY
CIR
CU
LATO
R TE
RMIN
AL
ON
SW
ITC
HIN
G R
ELA
Y,
THE
PRIM
ARY
PU
MP
DIP
SW
ITC
H S
ETS
OPE
RATI
ON
OF
THIS
OU
TPU
T.
NO
TE B
: W
HEN
SYS
TEM
CIR
CU
LATO
R IS
CO
NN
ECTE
D T
O R
ED W
IRE
ON
PC
705-
2, T
HE
CIR
CU
LATO
R W
ILL
OPE
RATE
ON
LY W
HEN
TH
ERM
OST
AT
CA
LLS
FOR
HEA
T
AN
D T
HE
OU
TDO
OR
TEM
PERA
TURE
IS B
ELO
W T
HE
WA
RM W
EATH
ER S
HU
T D
OW
N (
WW
SD)
TEM
PERA
TURE
. TH
E W
WSD
CA
N B
E A
DJU
STED
OR
TURN
ED
OFF
SO
TH
AT
THE
CIR
CU
LATO
R IS
NO
T A
FFEC
TED
BY
OU
TDO
OR
TEM
PERA
TURE
.
SYST
EMA
ND
/OR
BOIL
ERC
IRC
ULA
TOR
(SEE
NO
TE A
)
120
VAC
INPU
T
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: M
aste
rPr
iorit
y Z
one:
On
or O
ffRe
set/
Nor
mal
: Res
et
FOU
R Z
ON
EEX
PAN
DA
BLE
SWIT
CH
ING
REL
AY
POW
ERC
ON
TRO
LS
120
VAC
CIR
CU
LATO
RSZ
C
INPU
T12
0 VA
C
ZON
E 1
ZO
NE
2 ZO
NE
3 ZO
NE
4
ZON
E1 Z
ON
E2 Z
ON
E3
THER
MO
STA
TS
SR 5
04-E
XP-
4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
NET
EXPA
NSI
ON
MAI
NPR
IORI
TY
XX
XX
AB
CR
WC
RW
CR
WC
RW
C1
2
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
N/C
PRIM
ARY
120
VAC
ZR
HH
NH
NH
NH
NH
NH
NH
NH
SLA
VE
PR
IOR
ITY
ON
RE
SE
T
PR
IMA
RY
PU
MP
ON
PO
ST
PU
RG
E O
N
PR
IOR
ITY
PR
OTE
CT
ON
PU
MP
EX
ER
CIS
E O
N
30 S
EC
/2 W
K
MA
STE
R
OFF
OFF
OFF
OFF
OFF
NO
RM
AL
LOW
LIM
IT (Z
C) O
NO
FF
4 M
IN/2
4 H
OU
R
ZON
E4ZO
NE4
PRIO
RITY
AC
CES
SORY
PORT
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
T
HN
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
PC70
5 Va
riabl
e Sp
eed
Pum
p In
ject
ion
Cont
rol C
onne
cted
to E
XP S
witc
hing
Rel
ay
22
23
PC700 Boiler Reset Control Connected to 2 EXP Switching Relays
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
BOILER
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: MasterPriority Zone: On or OffReset/Normal: Reset
FOUR ZONEEXPANDABLE
SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
T
PRIMARY SYSTEMCIRCULATOR(OPTIONAL)
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: SlavePriority Zone: OffReset/Normal: Normal
FOUR ZONEEXPANDABLE
SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
T
H
N
MASTER
SLAVE
See NOTE 1
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
See NOTE 1
PC702 2–Stage Boiler Reset Control Connected to 2 EXP Switching Relays
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: MasterPriority Zone: On or OffReset/Normal: Reset
FOUR ZONEEXPANDABLE
SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
T
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: SlavePriority Zone: OffReset/Normal: Normal
FOUR ZONEEXPANDABLE
SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
T
H
N
MASTER
SLAVE
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#2
BOILER#1
DHWDEMAND
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
PRIMARY SYSTEMCIRCULATOR(OPTIONAL)
See NOTE 1
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
See NOTE 1
24
25
PC705 Variable Speed Pump Injection Control Connected to 2 EXP Switching Relays
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: MasterPriority Zone: On or OffReset/Normal: Reset
FOUR ZONEEXPANDABLE
SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
T
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: SlavePriority Zone: OffReset/Normal: Normal
FOUR ZONEEXPANDABLE
SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
T
H
N
MASTER
SLAVE
TO: "TT" ON BOILER
BOILER
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
(SEE NOTE BON PAGE 22)
(SEE NOTE AON PAGE 22)
PRIMARY SYSTEMCIRCULATOR(OPTIONAL)
See NOTE 1
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
See NOTE 1
PC700 and PC705 Controls Connected to 2 EXP Switching Relays
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: MasterPriority Zone: On or OffReset/Normal: Reset
FOUR ZONEEXPANDABLE
SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
T
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: SlavePriority Zone: OffReset/Normal: Reset
FOUR ZONEEXPANDABLE
SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
T
H
N
MASTER
SLAVE
TO: "TT" ON BOILER
BOILER
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
(SEE NOTE BON PAGE 22)
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
(SEE NOTE AON PAGE 22)
PRIMARY SYSTEMCIRCULATOR(OPTIONAL)
See NOTE 1
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
See NOTE 1
26
27
PC702 and PC705 Controls Connected to 2 EXP Switching Relays
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: MasterPriority Zone: On or OffReset/Normal: Reset
FOUR ZONEEXPANDABLE
SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
T
SWITCH SETTINGS
Master/Slave: SlavePriority Zone: OffReset/Normal: Reset
FOUR ZONEEXPANDABLE
SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
MASTER
SLAVE
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#2
BOILER#1
DHWDEMAND
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
120 VAC INPUTH
N
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
(SEE NOTE BON PAGE 22)
T
PRIMARY SYSTEMCIRCULATOR(OPTIONAL)
See NOTE 1
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
See NOTE 1
28
BO
ILE
R
HN
SYST
EMPU
MP
SYST
EM P
UM
P A
ND
BO
ILER
TU
RN O
NW
HEN
AN
Y Z
ON
E VA
LVE
OPE
NS.
12
34
ZO
NE
11
23
4Z
ON
E 2
12
34
ZO
NE
31
23
4Z
ON
E 4
12
34
ZO
NE
51
23
4Z
ON
E 6
PRIO
RITY
ZO
NE
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
MU
ST U
SE JU
MPE
R
TAC
O3
WIR
EZ
ON
E VA
LVE
1 2 3
JUM
PER
3 &
4
MO
TOR
END
SWIT
CH
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
,SE
LF C
LOSI
NG
)
JUM
PER
3 &
4
ZV
C 4
06 –
4
SIX
ZO
NE
ZO
NE
VALV
E C
ON
TRO
L
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
POWER IN24 VAC
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
DRY
CO
NTA
CTS
N/O
CO
MN
/C
PUM
P EN
DSW
ITC
HZ
ON
E 6
PUM
PEN
D S
WIT
CH
THER
MO
STA
TS (
24VA
C)
T ST
AT
1VA
LVE
1
T ST
AT
2VA
LVE
2
T ST
AT
3VA
LVE
3
T ST
AT
4VA
LVE
4
VALV
E 5
T ST
AT
6VA
LVE
6
POW
ER
LED
IND
ICA
TORS
T ST
AT
5
TO: B
OIL
ER A
QU
AST
AT
RELA
Y
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E 5
ZON
E 6
ISO
LATE
DX
X
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
24 V
AC
ZO
NE
VALV
ESPR
IORI
TY
XX
ZO
NE
6PR
IORI
TY OFF
ON
NO
TE
2:
Whe
n a
circ
ulat
oris
use
d on
the
prio
rity
zone
inst
ead
of a
zon
e va
lve,
jum
per
3 an
d 4
of t
hepr
iorit
y zo
ne.
FUSE
5 A
MP
RW
IND
IREC
TW
ATE
R H
EATE
RA
QU
AST
AT
OR
THER
MO
STA
T
See N
OT
E 1
RW
RW
RW
CC
CR
WC
C
FUSE
5 A
MP
RW
C
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
Pow
ered
from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
A B
Pow
ered
from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
TT
T
ZVC4
03/4
04/4
05/4
06 w
ith S
yste
m P
ump
BO
ILE
R
HN
DH
WPU
MP
12
34
ZO
NE
11
23
4Z
ON
E 2
12
34
ZO
NE
31
23
4Z
ON
E 4
12
34
ZO
NE
51
23
4Z
ON
E 6
PRIO
RITY
ZO
NE
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
MU
ST U
SE JU
MPE
R
TAC
O3
WIR
EZ
ON
E VA
LVE
1 2 3
JUM
PER
3 &
4
MO
TOR
END
SWIT
CH
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
,SE
LF C
LOSI
NG
)
JUM
PER
3 &
4
ZV
C 4
06 –
4
SIX
ZO
NE
ZO
NE
VALV
E C
ON
TRO
L
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
POWER IN24 VAC
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
N/O
CO
MN
/C
PUM
P EN
DSW
ITC
HZ
ON
E 6
PUM
PEN
D S
WIT
CH
THER
MO
STA
TS (
24VA
C)
T ST
AT
1VA
LVE
1
T ST
AT
2VA
LVE
2
T ST
AT
3VA
LVE
3
T ST
AT
4VA
LVE
4
VALV
E 5
T ST
AT
6VA
LVE
6
POW
ER
LED
IND
ICA
TORS
T ST
AT
5
TO: B
OIL
ER A
QU
AST
AT
RELA
Y
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E 5
ZON
E 6
ISO
LATE
DX
X
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
24 V
AC
ZO
NE
VALV
ESPR
IORI
TY
XX
ZO
NE
6PR
IORI
TY OFF
ON
NO
TE
2:
Whe
n a
circ
ulat
oris
use
d on
the
prio
rity
zone
inst
ead
of a
zon
e va
lve,
jum
per
3 a
nd 4
of t
hep
riorit
y zo
ne.
FUSE
5 A
MP
RW
IND
IREC
TW
ATE
R H
EATE
RA
QU
AST
AT
OR
THER
MO
STA
T
See N
OT
E 1
RW
RW
RW
CC
CR
WC
C
FUSE
5 A
MP
RW
C
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
Pow
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from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
A B
Pow
ered
from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
BOIL
ER T
URN
S O
N W
HEN
AN
Y Z
ON
E VA
LVE
OPE
NS.
DH
W P
UM
P TU
RNS
ON
ON
LY W
HEN
PRI
ORI
TY Z
ON
E C
ALL
S.
TT
T
29
ZVC4
03/4
04/4
05/4
06 w
ith D
omes
tic H
ot W
ater
(DHW
) Pum
p
30
BO
ILE
R
HN
DH
WPU
MP
12
34
ZO
NE
11
23
4Z
ON
E 2
12
34
ZO
NE
31
23
4Z
ON
E 4
12
34
ZO
NE
51
23
4Z
ON
E 6
PRIO
RITY
ZO
NE
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
MU
ST U
SE JU
MPE
R
TAC
O3
WIR
EZ
ON
E VA
LVE
1 2 3
JUM
PER
3 &
4
MO
TOR
END
SWIT
CH
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
,SE
LF C
LOSI
NG
)
JUM
PER
3 &
4
ZV
C 4
06 –
4
SIX
ZO
NE
ZO
NE
VALV
E C
ON
TRO
L
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
POWER IN24 VAC
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
N/O
CO
MN
/C
PUM
P EN
DSW
ITC
HZ
ON
E 6
PUM
PEN
D S
WIT
CH
THER
MO
STA
TS (
24VA
C)
T ST
AT
1VA
LVE
1
T ST
AT
2VA
LVE
2
T ST
AT
3VA
LVE
3
T ST
AT
4VA
LVE
4
VALV
E 5
T ST
AT
6VA
LVE
6
POW
ER
LED
IND
ICA
TORS
T ST
AT
5
TO: B
OIL
ER A
QU
AST
AT
RELA
Y
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E 5
ZON
E 6
ISO
LATE
DX
X
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
24 V
AC
ZO
NE
VALV
ESPR
IORI
TY
XX
ZO
NE
6PR
IORI
TY OFF
ON
NO
TE
2:
Whe
n a
circ
ulat
oris
use
d on
the
prio
rity
zone
inst
ead
of a
zon
e va
lve,
jum
per
3 a
nd 4
of t
hep
riorit
y zo
ne.
FUSE
5 A
MP
RW
IND
IREC
TW
ATE
R H
EATE
RA
QU
AST
AT
OR
THER
MO
STA
T
See N
OT
E 1
RW
RW
RW
CC
CR
WC
C
FUSE
5 A
MP
RW
C
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
Pow
ered
from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
A B
Pow
ered
from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
SYST
EM P
UM
P A
ND
BO
ILER
TU
RN O
N W
HEN
AN
Y Z
ON
E VA
LVE
OPE
NS.
DH
W P
UM
P TU
RNS
ON
ON
LY W
HEN
PRI
ORI
TY Z
ON
E C
ALL
S.
SYST
EMPU
MP
TT
T
ZVC4
03/4
04/4
05/4
06 w
ith S
yste
m a
nd D
HW P
umps
31
BO
ILE
R
HN
DH
WPU
MP
12
34
ZO
NE
11
23
4Z
ON
E 2
12
34
ZO
NE
31
23
4Z
ON
E 4
12
34
ZO
NE
51
23
4Z
ON
E 6
PRIO
RITY
ZO
NE
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
MU
ST U
SE JU
MPE
R
TAC
O3
WIR
EZ
ON
E VA
LVE
1 2 3
JUM
PER
3 &
4
MO
TOR
END
SWIT
CH
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
,SE
LF C
LOSI
NG
)
JUM
PER
3 &
4
ZV
C 4
06 –
4
SIX
ZO
NE
ZO
NE
VALV
E C
ON
TRO
L
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
POWER IN24 VAC
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
N/O
CO
MN
/C
PUM
P EN
DSW
ITC
HZ
ON
E 6
PUM
PEN
D S
WIT
CH
THER
MO
STA
TS (
24VA
C)
T ST
AT
1V
ALV
E 1
T ST
AT
2V
ALV
E 2
T ST
AT
3V
ALV
E 3
T ST
AT
4V
ALV
E 4
VA
LVE
5
T ST
AT
6V
ALV
E 6
POW
ER
LED
IND
ICA
TORS
T ST
AT
5
TO: B
OIL
ER A
QU
AST
AT
RELA
Y
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E 5
ZON
E 6
ISO
LATE
DX
X
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
24 V
AC
ZO
NE
VALV
ESPR
IORI
TY
XX
ZO
NE
6PR
IORI
TY OFF
ON
NO
TE
2:
Whe
n a
circ
ulat
oris
use
d on
the
prio
rity
zone
inst
ead
of a
zon
e va
lve,
jum
per
3 a
nd 4
of t
hep
riorit
y zo
ne.
FUSE
5 A
MP
RW
IND
IREC
TW
ATE
R H
EATE
RA
QU
AST
AT
OR
THER
MO
STA
T
See N
OT
E 1
RW
RW
RW
CC
CR
WC
C
FUSE
5 A
MP
RW
C
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
Pow
ered
from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
A B
Pow
ered
from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
SYST
EMPU
MP
SEC
ON
DA
RYPU
MP
SYST
EM P
UM
P A
ND
BO
ILER
TU
RN O
N W
HEN
AN
Y Z
ON
E VA
LVE
OPE
NS.
DH
W P
UM
P TU
RNS
ON
ON
LY W
HEN
PRI
ORI
TY Z
ON
E C
ALL
S.SE
CO
ND
ARY
PU
MP
CO
MES
ON
WH
EN A
NY
ZO
NE
CA
LLS
EXC
EPT
PRI
ORI
TY Z
ON
E.
TT
T
ZVC4
03/4
04/4
05/4
06 w
ith S
yste
m, D
HW a
nd S
econ
dary
Pum
ps
32
2 ZVC403/404/405/406 Connected Together with Priority
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 404 – 4
FOUR ZONEZONE VALVE CONTROL
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK POW
ER IN
24 V
AC
TOCIRCULATOR
DRYCONTACTS
N/O COM N/C
PUMP ENDSWITCH
FUSE
5 A
MP
ZONE 4 PUMPEND SWITCH
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
POWER
LEDINDICATORS
ZONE 1 ZONE 2 ZONE 3 ZONE 4ISOLATEDX X
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES PRIORITY
X X
ZONE 4PRIORITY
OFF
ON
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
THERMOSTATS (24VAC)
R W R W R WC C C
See NOTE 1
R W C
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK POW
ER IN
24 V
AC
TOCIRCULATOR
DRYCONTACTS
N/O COM N/C
PUMP ENDSWITCH
FUSE
5 A
MP
ZONE 4 PUMPEND SWITCH
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
POWER
LEDINDICATORS
TO: BOILER AQUASTAT RELAY
ZONE 1 ZONE 2 ZONE 3 ZONE 4ISOLATEDX X
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES PRIORITY
X X
ZONE 4PRIORITY
OFF
ON
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
THERMOSTATS (24VAC)
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
R W R W R WC C C
See NOTE 1
R W C
BOILER
H
N
TO: BOILER AQUASTAT RELAY
PRIORITYON
PRIORITYON
T T T
T T T
ZVC 404 – 4
FOUR ZONEZONE VALVE CONTROL
33
2 EXP Zone Valve Controls Connected Together with System Pump
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
SWITCH SETTINGS
Master/Slave: MasterPriority Zone: OnReset/Normal: Normal
SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Normal
120 VACINPUT
MASTER
SLAVE
SYSTEM PUMP AND BOILER TURN ONWHEN ANY ZONE VALVE OPENS.
SYSTEMPUMP
DRYCONTACTS
DRYCONTACTS
TO: BOILER AQUASTAT RELAY
TO: "TT" ON BOILER WITH DHW "TT" INPUT
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
PRIORITY
PRIORITY
XX
PUMP ENDSWITCH
XX
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
See NOTE 2
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
Powered from Transformer A
A
B
A
B
Powered from Transformer A Powered from Transformer B
Powered from Transformer A Powered from Transformer B
Powered from Transformer B
See NOTE 1
T T T
T T T
34
2 EXP Zone Valve Controls Connected Together with DHW Pump
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
SWITCH SETTINGS
Master/Slave: MasterPriority Zone: OnReset/Normal: Normal
SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Normal
120 VACINPUT
MASTER
SLAVE
DHWPUMP
DRYCONTACTS
TO: BOILER AQUASTAT RELAY
TO: "TT" ON BOILER WITH DHW "TT" INPUT
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
PRIORITY
PRIORITY
XX
PUMP ENDSWITCH
XX
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
See NOTE 2
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
Powered from Transformer A
A
B
A
B
Powered from Transformer A Powered from Transformer B
Powered from Transformer A Powered from Transformer B
Powered from Transformer B
See NOTE 1
T T T
T T T
BOILER TURNS ON WHENANY ZONE VALVE OPENS.
DHW PUMP TURNS ON ONLYWHEN PRIORITY ZONE CALLS.
2 EXP Zone Valve Controls Connected Together with System and DHW Pumps
35
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
SWITCH SETTINGS
Master/Slave: MasterPriority Zone: OnReset/Normal: Normal
SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Normal
120 VACINPUT
MASTER
SLAVE
DHWPUMP
DRYCONTACTS
TO: BOILER AQUASTAT RELAY
TO: "TT" ON BOILER WITH DHW "TT" INPUT
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
PRIORITY
PRIORITY
XX
PUMP ENDSWITCH
XX
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
See NOTE 2
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
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A
B
A
B
Powered from Transformer A Powered from Transformer B
Powered from Transformer A Powered from Transformer B
Powered from Transformer B
See NOTE 1
T T T
T T T
SYSTEM PUMP AND BOILER TURN ONWHEN ANY ZONE VALVE OPENS.
DHW PUMP TURNS ON ONLYWHEN PRIORITY ZONE CALLS.
SYSTEMPUMP
36
2 EXP Zone Valve Controls Connected Together with System, DHW and Secondary Pumps
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
SWITCH SETTINGS
Master/Slave: MasterPriority Zone: OnReset/Normal: Normal
SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Normal
120 VACINPUT
MASTER
SLAVE
DHWPUMP
DRYCONTACTS
TO: BOILER AQUASTAT RELAY
TO: "TT" ON BOILER WITH DHW "TT" INPUT
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
PRIORITY
PRIORITY
XX
PUMP ENDSWITCH
XX
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
See NOTE 2
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
Powered from Transformer A
A
B
A
B
Powered from Transformer A Powered from Transformer B
Powered from Transformer A Powered from Transformer B
Powered from Transformer B
See NOTE 1
T T T
T T T
SYSTEM PUMP AND BOILER TURN ONWHEN ANY ZONE VALVE OPENS.
DHW PUMP TURNS ON ONLYWHEN PRIORITY ZONE CALLS.
SECONDARY PUMP COMES ON WHENANY ZONE CALLS EXCEPT PRIORITY ZONE.
SYSTEMPUMP SECONDARY
PUMP
37
PC70
0 Bo
iler R
eset
Con
trol C
onne
cted
To
EXP
Zone
Val
ve C
ontro
l
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
H N
BO
ILE
R
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: M
aste
rPr
iorit
y Z
one:
On
or O
ffRe
set/
Nor
mal
: Res
et
120
VA
CIN
PUT
SYST
EM P
UM
P A
ND
BO
ILER
TU
RN O
NW
HEN
AN
Y Z
ON
E VA
LVE
OPE
NS.
SYST
EMPU
MP
DRY
CO
NTA
CTS
TO:
BOIL
ER A
QU
AST
AT
RELA
Y
TO:
"TT"
ON
BO
ILER
WIT
H
D
HW
"TT
" IN
PUT
12
34
ZO
NE
11
23
4Z
ON
E 2
12
34
ZO
NE
31
23
4Z
ON
E 4
12
34
ZO
NE
51
23
4Z
ON
E 6
PRIO
RITY
ZO
NE
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
MU
ST U
SE JU
MPE
R
TAC
O3
WIR
EZ
ON
E VA
LVE
1 2 3
JUM
PER
3 &
4
MO
TOR
END
SWIT
CH
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
,SE
LF C
LOSI
NG
)
JUM
PER
3 &
4
ZVC
406
-EX
P-4
SIX
ZO
NE
EXPA
ND
ABL
EZ
ON
E VA
LVE
CO
NTR
OL
POWER IN24 VAC
N/O
CO
MN
/C
PUM
P EN
DSW
ITC
HZ
ON
E 6
PUM
PEN
D S
WIT
CH
SLA
VE
PR
IOR
ITY
ON
RE
SE
TP
OS
T P
UR
GE
ON
PR
IOR
ITY
PR
OTE
CTI
ON
ON
PU
MP
EX
ER
CIS
E O
N30
SE
C/2
WK
MA
STE
RO
FFN
OR
MA
LO
FFO
FFO
FF4
MIN
/24
HO
UR
THER
MO
STA
TS (
24 V
AC
)IN
DIR
ECT
WA
TER
HEA
TER
AQ
UA
STA
T O
RTH
ERM
OST
AT
T ST
AT
1VA
LVE
1
T ST
AT
2VA
LVE
2
T ST
AT
3VA
LVE
3
T ST
AT
4VA
LVE
4
VALV
E 5
T ST
AT
6VA
LVE
6
POW
ER
LED
IND
ICA
TORS
T ST
AT
5
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E 5
ZON
E 6
NET
EXPA
NSI
ON
MAI
NPR
IORI
TY
XX
XX
AB
CR
WC
RW
CR
WC
RW
CR
WC
RW
C1
2
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
24 V
AC
ZO
NE
VALV
ESPR
IORI
TY
XX
POW
ERC
ON
TRO
LS AC
CES
SORY
PORT
FUSE
5 A
MP
FUSE
5 A
MP
Pow
ered
from
Tra
nsfo
rmer
A
A B
NO
TE
2:
Whe
n a
circ
ulat
oris
use
d on
the
prio
rity
zone
inst
ead
of a
zon
e va
lve,
jum
per
3 an
d 4
of t
hepr
iorit
y zo
ne.
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
Pow
ered
from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
Pow
ered
from
Tra
nsfo
rmer
B
See
NO
TE
1
TT
T
ZONE
CONT
ROL
BOIL
SEN
OUT
SEN B
OIL
ER
SE
NS
OR
OU
TDO
OR
SE
NS
OR
PC
700
38
PC70
2 2–
Stag
e Bo
iler R
eset
Con
trol C
onne
cted
To
EXP
Zone
Val
ve C
ontro
l
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: M
aste
rPr
iorit
y Z
one:
On
or O
ffRe
set/
Nor
mal
: Res
et
SYST
EMPU
MP
12
34
ZO
NE
11
23
4Z
ON
E 2
12
34
ZO
NE
31
23
4Z
ON
E 4
12
34
ZO
NE
51
23
4Z
ON
E 6
PRIO
RITY
ZO
NE
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
MU
ST U
SE JU
MPE
R
TAC
O3
WIR
EZ
ON
E VA
LVE
1 2 3
JUM
PER
3 &
4
MO
TOR
END
SWIT
CH
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
,SE
LF C
LOSI
NG
)
JUM
PER
3 &
4
ZVC
406
-EX
P-4
SIX
ZO
NE
EXPA
ND
ABL
EZ
ON
E VA
LVE
CO
NTR
OL
POWER IN24 VAC
N/O
CO
MN
/C
PUM
P EN
DSW
ITC
HZ
ON
E 6
PUM
PEN
D S
WIT
CH
SLA
VE
PR
IOR
ITY
ON
RE
SE
TP
OS
T P
UR
GE
ON
PR
IOR
ITY
PR
OTE
CTI
ON
ON
PU
MP
EX
ER
CIS
E O
N30
SE
C/2
WK
MA
STE
RO
FFN
OR
MA
LO
FFO
FFO
FF4
MIN
/24
HO
UR
THER
MO
STA
TS (
24 V
AC
)IN
DIR
ECT
WA
TER
HEA
TER
AQ
UA
STA
T O
RTH
ERM
OST
AT
T ST
AT
1VA
LVE
1
T ST
AT
2VA
LVE
2
T ST
AT
3VA
LVE
3
T ST
AT
4VA
LVE
4
VALV
E 5
T ST
AT
6VA
LVE
6
POW
ER
LED
IND
ICA
TORS
T ST
AT
5
ZON
E 1
ZON
E 2
ZO
NE
3
ZON
E 4
ZON
E 5
ZON
E 6
NET
EXPA
NSI
ON
MAI
NPR
IORI
TY
XX
XX
AB
CR
WC
RW
CR
WC
RW
CR
WC
RW
C1
2
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
24 V
AC
ZO
NE
VALV
ESPR
IORI
TY
XX
POW
ERC
ON
TRO
LS
AC
CES
SORY
PORT
FUSE
5 A
MP
FUSE
5 A
MP
Pow
ered
from
Tra
nsfo
rmer
A
A B
NO
TE
2:
Whe
n a
circ
ulat
oris
use
d on
the
prio
rity
zone
inst
ead
of a
zon
e va
lve,
jum
per
3 a
nd 4
of t
hep
riorit
y zo
ne.
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
Pow
ered
from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
Pow
ered
from
Tra
nsfo
rmer
B
See
NO
TE
1
TT
T
BO
ILE
R#2ZO
NECO
NTRO
LBO
ILSE
NOU
TSE
N BO
ILE
R S
EN
SO
R
OU
TDO
OR
SE
NS
OR
PC
702
STAG
E1
STAG
E2
BO
ILE
R#1
DH
WD
EM
AN
D
WIR
ING
NEE
DED
ON
LY IF
PRIO
RITY
ZO
NE
IS D
HW
SYST
EM P
UM
P A
ND
BO
ILER
TU
RN O
N W
HEN
AN
Y Z
ON
E VA
LVE
OPE
NS.
DH
W C
IRC
ULA
TOR
TURN
S O
N O
NLY
WH
EN P
RIO
RITY
ZO
NE
CA
LLS.
DH
WPU
MP
H N
120
VA
CIN
PUT
39
PC70
5 Va
riabl
e Sp
eed
Pum
p In
ject
ion
Cont
rol C
onne
cted
To
EXP
Zone
Val
ve C
ontro
l
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
H N
BO
ILE
R
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
SWIT
CH
SET
TIN
GS
Mas
ter/
Slav
e: M
aste
rPr
iorit
y Z
one:
On
or O
ffRe
set/
Nor
mal
: Res
et
120
VA
CIN
PUT SY
STEM
CIR
CU
LATO
R A
ND
BO
ILER
TU
RN O
NW
HEN
AN
Y Z
ON
E VA
LVE
OPE
NS.
SYST
EM C
IRC
ULA
TOR
(OPT
ION
AL
LOC
ATI
ON
)
DRY
CO
NTA
CTS
TO:
BOIL
ER A
QU
AST
AT
RELA
Y
TO:
"TT"
ON
BO
ILER
WIT
H
D
HW
"TT
" IN
PUT
12
34
ZO
NE
11
23
4Z
ON
E 2
12
34
ZO
NE
31
23
4Z
ON
E 4
12
34
ZO
NE
51
23
4Z
ON
E 6
PRIO
RITY
ZO
NE
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
MU
ST U
SE JU
MPE
R
TAC
O3
WIR
EZ
ON
E VA
LVE
1 2 3
JUM
PER
3 &
4
MO
TOR
END
SWIT
CH
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
,SE
LF C
LOSI
NG
)
JUM
PER
3 &
4
ZVC
406
-EX
P-4
SIX
ZO
NE
EXPA
ND
ABL
EZ
ON
E VA
LVE
CO
NTR
OL
POWER IN24 VAC
N/O
CO
MN
/C
PUM
P EN
DSW
ITC
HZ
ON
E 6
PUM
PEN
D S
WIT
CH
SLA
VE
PR
IOR
ITY
ON
RE
SE
TP
OS
T P
UR
GE
ON
PR
IOR
ITY
PR
OTE
CTI
ON
ON
PU
MP
EX
ER
CIS
E O
N30
SE
C/2
WK
MA
STE
RO
FFN
OR
MA
LO
FFO
FFO
FF4
MIN
/24
HO
UR
THER
MO
STA
TS (
24 V
AC
)IN
DIR
ECT
WA
TER
HEA
TER
AQ
UA
STA
T O
RTH
ERM
OST
AT
T ST
AT
1V
ALV
E 1
T ST
AT
2V
ALV
E 2
T ST
AT
3V
ALV
E 3
T ST
AT
4V
ALV
E 4
VA
LVE
5
T ST
AT
6V
ALV
E 6
POW
ER
LED
IND
ICA
TORS
T ST
AT
5
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E 5
ZON
E 6
NET
EXPA
NSI
ON
MAI
NPR
IORI
TY
XX
XX
AB
CR
WC
RW
CR
WC
RW
CR
WC
RW
C1
2
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
24 V
AC
ZO
NE
VALV
ESPR
IORI
TY
XX
POW
ERC
ON
TRO
LS
AC
CES
SORY
PORT
FUSE
5 A
MP
FUSE
5 A
MP
Pow
ered
from
Tra
nsfo
rmer
A
A B
NO
TE
2:
Whe
n a
circ
ulat
oris
use
d o
n th
e p
riorit
y zo
nein
stea
d o
f a z
one
valv
e,ju
mp
er 3
and
4 o
f the
prio
rity
zone
.
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
Pow
ered
from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
Pow
ered
from
Tra
nsfo
rmer
B
See
NO
TE
1
TT
T
ZONE
CONT
ROL
BOIL
SEN
OUT
SEN
BO
ILE
R S
EN
SO
R
OU
TDO
OR
SE
NS
OR
PC
705-
2
SUP
SEN
SU
PP
LY S
EN
SO
R
INJE
CTI
ON
CIR
CU
LATO
R
SYST
EMC
IRC
ULA
TOR
AN
D/O
R BO
ILER
BLA
CK
BLU
E
REDG
REEN
/GRO
UN
D (SEE
NO
TE B
ON
PA
GE
22)
40
PC700 Boiler Reset Control Connected To 2 EXP Zone Valve Controls
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
SWITCH SETTINGS
Master/Slave: MasterPriority Zone: On or OffReset/Normal: Reset
SWITCH SETTINGS
Master/Slave: SlavePriority Zone: OffReset/Normal: Normal
120 VACINPUT
MASTER
SLAVE
DHWPUMP
DRYCONTACTS
TO: BOILER AQUASTAT RELAY
TO: "TT" ON BOILER WITH DHW "TT" INPUT
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
PRIORITY
PRIORITY
XX
PUMP ENDSWITCH
XX
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
See NOTE 2
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
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See NOTE 1
T T T
T T T
SYSTEM PUMP AND BOILER TURN ONWHEN ANY ZONE VALVE OPENS.
DHW PUMP TURNS ON ONLYWHEN PRIORITY ZONE CALLS.
SYSTEMPUMP
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
41
PC702 2–Stage Boiler Reset Control Connected To 2 EXP Zone Valve Controls
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
H
N
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK 24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
SWITCH SETTINGS
Master/Slave: MasterPriority Zone: On or OffReset/Normal: Reset
SWITCH SETTINGS
Master/Slave: SlavePriority Zone: OffReset/Normal: Normal
120 VACINPUT
MASTER
SLAVE
DHWPUMP
DRYCONTACTS
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
PRIORITY
PRIORITY
XX
PUMP ENDSWITCH
XX
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
See NOTE 2
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
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See NOTE 1
T T T
T T T
SYSTEM PUMP AND BOILER TURN ONWHEN ANY ZONE VALVE OPENS.
DHW PUMP TURNS ON ONLYWHEN PRIORITY ZONE CALLS.
SYSTEMPUMP
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#2
BOILER#1
DHWDEMAND
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
42
PC705 Variable Speed Pump Injection Control Connected To 2 EXP Zone Valve Controls
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
SWITCH SETTINGS
Master/Slave: MasterPriority Zone: On or OffReset/Normal: Reset
SWITCH SETTINGS
Master/Slave: SlavePriority Zone: OffReset/Normal: Normal
120 VACINPUT
MASTER
SLAVE
DRYCONTACTS
TO:
BOIL
ERA
QU
AST
AT
RELA
Y
TO: "TT" ON BOILER WITH DHW "TT" INPUT
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
PRIORITY
PRIORITY
XX
PUMP ENDSWITCH
XX
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
See NOTE 2
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
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See NOTE 1
T T T
T T T
SYSTEMCIRCULATOR
(OPTIONAL LOCATION)
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
(SEE NOTE BON PAGE 22)
43
PC700 and PC705 Connected To 2 EXP Zone Valve Controls
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
SWITCH SETTINGSMaster/Slave: MasterPriority Zone: On or OffReset/Normal: Reset
SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Reset
120 VACINPUT
MASTER
SLAVE
DHWPUMP
DRYCONTACTS
TO: BOILER AQUASTAT RELAY
TO: "TT" ON BOILER WITH DHW "TT" INPUT
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE V(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
PRIORITY
PRIORITY
XX
PUMP ENDSWITCH
XX
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
See NOTE 2
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
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See NOTE 1
T T T
T T T
SYSTEM PUMP AND BOILER TURN ONWHEN ANY ZONE VALVE OPENS. SYSTEM
PUMP
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
(SEE NOTE BON PAGE 22)
DHW PUMP TURNS ON ONLYWHEN PRIORITY ZONE CALLS.
44
PC702 and PC705 Connected To 2 EXP Zone Valve Controls
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
H
N
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK 24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
SWITCH SETTINGS
Master/Slave: MasterPriority Zone: On or OffReset/Normal: Reset
SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Reset
120 VACINPUT
MASTER
SLAVE
DHWPUMP
DRYCONTACTS
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
PRIORITY
PRIORITY
XX
PUMP ENDSWITCH
XX
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
See NOTE 2
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
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See NOTE 1
T T T
T T T
SYSTEM PUMP AND BOILER TURN ONWHEN ANY ZONE VALVE OPENS.
SYSTEMPUMP
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#2
BOILER#1
DHWDEMAND
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
DHW PUMP TURNS ON ONLYWHEN PRIORITY ZONE CALLS.
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
(SEE NOTE BON PAGE 22)
45
HAFC101-4 with 1 Speed Air Handler
HAFC101-4HYDRO AIR FAN CONTROL
THERMOSTATC R W Y G
AQUASTATT T
HAFC101-4
BOILERC
AIR HANDLERX X R Y GL GH
THERMOSTAT
T
HAFC 101 WITH 1 SPEED AIR HANDLER(Both HFC 101 and HAFC 201 are
capable of 1 and 2 speed applications.)
To: Aquastaton Return Lineof Hydro Coil
Optional Power Wireto Thermostatthat Requires 24VAC
FANRELAY
LIN
E24
VA
C
OUTDOORCONDENSER
UNITDry Contacts To:“T T” on Boileror SwitchingRelay
M
JUMPER
POWER
HEAT CALL
LEDINDICATORS
COOL FAN
HEAT FAN
46
HAFC101-4 with 2 Speed Air Handler
HAFC101-4HYDRO AIR FAN CONTROL
THERMOSTATC R W Y G
AQUASTATT T
HAFC101-4
BOILERC
AIR HANDLERX X R Y GL GH
THERMOSTAT
T
HAFC 101 WITH 2 SPEED AIR HANDLER(Both HFC 101 and HAFC 201 are
capable of 1 and 2 speed applications.)
To: Aquastaton Return Lineof Hydro Coil
Optional Power Wireto Thermostatthat Requires 24VAC
OUTDOORCONDENSER
UNIT
FANRELAY
LIN
E24
VA
C
LOW
HIG
H
M
Dry Contacts To:“T T” on Boileror SwitchingRelay
POWER
HEAT CALL
LEDINDICATORS
COOL FAN
HEAT FAN
47
HAFC201-4 with 1 Speed Air Handler
HAFC201-4HYDRO AIR FAN CONTROL
THERMOSTAT
POWER
HEAT CALL
LEDINDICATORS
THERMOSTAT
T
C R W Y GAQUASTATS
T T
HAFC201-4
COOL FAN
HEAT FAN
BOILERC
AIR HANDLERX X R Y GL GH
WATERCOIL
FREEZEPROT.
T T
X X
PUMP
1 MIN
FAN
DE
LAY
3 MIN
FAN
DE
LAY
2MIN
/24HR
or 30SE
C/2W
K
PU
MP
EX
ER
CIS
E
OFF O
N
HAFC 201 WITH 1 SPEED AIR HANDLER(Both HFC 101 and HAFC 201 are
capable of 1 and 2 speed applications.)
To: OptionalAquastat onReturn Line ofHydro Coil
To: Optional Aquastator Thermostat to senselow ambienttemperature
Optional Power Wireto Thermostatthat Requires 24VAC
NOTE: For 4 minuteON DELAY of Heating Fan,switch 1 and 3 MIN ONDELAY to ON position.
FANRELAY
LIN
E24
VA
C
OUTDOORCONDENSER
UNIT
JUMPER
CIRCULATOR(or to “T T” onswitching relay)
Dry Contacts To:“T T” on Boileror SwitchingRelay
H
N
120 VACINPUT
M
48
HAFC201-4 with 2 Speed Air Handler
HAFC201-4HYDRO AIR FAN CONTROL
THERMOSTAT
POWER
HEAT CALL
LEDINDICATORS
THERMOSTAT
T
C R W Y GAQUASTATS
T T
HAFC201-4
COOL FAN
HEAT FAN
BOILERC
AIR HANDLERX X R Y GL GH
WATERCOIL
FREEZEPROT.
T T
X X
PUMP
1 MIN
FAN
DE
LAY
3 MIN
FAN
DE
LAY
2MIN
/24HR
or 30SE
C/2W
K
PU
MP
EX
ER
CIS
E
OFF O
N
HAFC 201 WITH 2 SPEED AIR HANDLER(Both HFC 101 and HAFC 201 are
capable of 1 and 2 speed applications.)
To: OptionalAquastat onReturn Line ofHydro Coil
To: Optional Aquastator Thermostat to senselow ambienttemperature
Optional Power Wireto Thermostatthat Requires 24VAC
NOTE: For 4 minuteON DELAY of Heating Fan,switch 1 and 3 MIN ONDELAY to ON position.
OUTDOORCONDENSER
UNIT
CIRCULATOR(or to “T T” onswitching relay)
Dry Contacts To:“T T” on Boileror SwitchingRelay
H
N
120 VACINPUT
FANRELAY
LIN
E24
VA
C
LOW
HIG
H
M
49
Mul
tiple
HAF
C’s
and
Switc
hing
Rel
ay
TO:
"TT"
ON
BO
ILER
H N
120
VAC
INPU
T
FOU
R Z
ON
E SW
ITC
HIN
G R
ELA
Y
120
VAC
CIR
CU
LATO
RS
ZC
IN
PUT
120
VAC
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
Z
ON
E1 Z
ON
E2 Z
ON
E3
SR 5
04-4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
P
XX
RW
RW
RW
RW
ISO
LATE
DEN
DSW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
120
VAC
ZR
HH
NH
NH
NH
NH
NH
ZON
E4
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
ZO
NE
4PR
IORI
TY OFF
ON
PRIO
RITY
24 V
AC
COM
BO
ILE
RIN
DIR
ECT
WA
TER
HEA
TER
AQ
UA
STA
T O
RTH
ERM
OST
AT
JUM
PER
HA
FC10
1-4
HY
DR
O A
IR F
AN
CO
NT
RO
L
THE
RM
OS
TAT
CR
WY
G
AQ
UA
STA
TT
T
HA
FC10
1-4
BO
ILER
CA
IR H
AN
DLE
RX
XR
YG
LG
H
THER
MO
STA
T
TTo
: Aqu
asta
ton
Ret
urn
Line
of H
ydro
Coi
lO
ptio
nal P
ower
Wire
to T
herm
osta
tth
at R
equi
res
24VA
C
OU
TDO
OR
CO
ND
ENSE
RU
NIT
FAN
RELA
Y
LINE24 VAC
LOW
HIGH M
HA
FC10
1-4
HY
DR
O A
IR F
AN
CO
NT
RO
L
THE
RM
OS
TAT
CR
WY
G
AQ
UA
STA
TT
T
HA
FC10
1-4
BO
ILER
CA
IR H
AN
DLE
RX
XR
YG
LG
H
THER
MO
STA
T
TTo
: Aqu
asta
ton
Ret
urn
Line
of H
ydro
Coi
lO
ptio
nal P
ower
Wire
to T
herm
osta
tth
at R
equi
res
24VA
C
OU
TDO
OR
CO
ND
ENSE
RU
NIT
FAN
RELA
Y
LINE24 VAC
LOW
HIGH M
HA
FC10
1-4
HY
DR
O A
IR F
AN
CO
NT
RO
L
THE
RM
OS
TAT
CR
WY
G
AQ
UA
STA
TT
T
HA
FC10
1-4
BO
ILER
CA
IR H
AN
DLE
RX
XR
YG
LG
H
THER
MO
STA
T
TTo
: Aqu
asta
ton
Ret
urn
Line
of H
ydro
Coi
lO
ptio
nal P
ower
Wire
to T
herm
osta
tth
at R
equi
res
24VA
C
OU
TDO
OR
CO
ND
ENSE
RU
NIT
FAN
RELA
Y
LINE24 VAC
LOW
HIGH M
TWO
SPE
ED A
IR H
AN
DLE
RTW
O S
PEED
AIR
HA
ND
LER
TWO
SPE
ED A
IR H
AN
DLE
R
POW
ER
HEA
T C
ALL
LED
IND
ICA
TORS
CO
OL
FAN
HEA
T FA
N
POW
ER
HEA
T C
ALL
LED
IND
ICA
TORS
CO
OL
FAN
HEA
T FA
N
POW
ER
HEA
T C
ALL
LED
IND
ICA
TORS
CO
OL
FAN
HEA
T FA
N
120 VAC INPUT
BOILER
SWITCH SETTINGS
120 VAC INPUTH
N
SWITCH SETTINGSMaster/Slave: MasterPriority Zone: OnReset/Normal: Normal
TO: "TT" ON BOILER
DHWCIRCULATOR
SLAVE(EXISTING CONTROL)
MASTER(NEW CONTROL)
PRIMARY SYSTEMCIRCULATOR(OPTIONAL)
TO: "TT" ON BOILER WITH DHW "TT" INPUT
SIX ZONEEXPANDABLE SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5
THERMOSTATS
SR 506-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE6 ZONE6
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
ZONE 5
ZONE 6
LEDINDICATORS
T
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
See NOTE 1
FOUR ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
1234 PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504-EXP
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
REMOVEJUMPER
THERMOSTATST
Master/Slave: MasterPriority Zone: OffReset/Normal: Normal
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
New Expandable Switching Relay Connected to an Older Expandable Switching Relay
50
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
SWITCH SETTINGS
Master/Slave: MasterPriority Zone: OnReset/Normal: Normal
SWITCH SETTINGSMaster/Slave: MasterPriority Zone: OnReset/Normal: Normal
120 VACINPUT
MASTER(NEW CONTROL)
SLAVE(EXISTING CONTROL)
SYSTEM PUMP AND BOILER TURN ONWHEN ANY ZONE VALVE OPENS.
SYSTEMPUMP
TO: BOILER AQUASTAT RELAY
TO: "TT" ON BOILER WITH DHW "TT" INPUT
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
THERMOSTATS (24 VAC)INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES PRIORITY
XX
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
Powered from Transformer A
A
B
A
B
Powered from Transformer A Powered from Transformer B
Powered from Transformer B
See NOTE 1
THERMOSTATS (24 VAC)
T T T
T T T
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
(not used)
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVE
POWERCONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
BOILER
ENDSWITCH
BPUMP
SYSTEMPUMP
New Expandable Zone Valve Control Connected to an Older Expandable Zone Valve Control
51
ZVC404-EXP Zone Valve Control Connected to a MOD–CON Boiler
52
SR504-EXP Switching Relay Connected to a MOD–CON Boiler
PRIMARY SYSTEMCIRCULATOR(OPTIONAL)
FOUR ZONEEXPANDABLE
SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
SPACE HEATER DEMAND
DHW DEMAND
MOD-CONBOILER
DHW PUMPOUTPUT
(NOT USED)
120 VACINPUT
H
N
SPA
CE
HEA
TIN
GPU
MP
OU
TPU
T
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
NOTE 1: Terminals Care for optional 24Vthermostat COMMONconnections.
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
PRIORITYZONE
2 WIREZONE VALVE
(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIREZONE VALVE
(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
POWERCONTROLS
SEE NOTE 2
ZVC 404-EXP-4FOUR ZONE EXPANDABLE
ZONE VALVE CONTROL
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
POW
ER IN
24 V
AC
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COM N/C
PUMP ENDSWITCH
ZONE 4 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
NOTE 2: When a circulator is usedon the priority zone instead of azone valve, jumper 3 and 4 ofthe priority zone.
THERMOSTATS (24 VAC)
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
POWER
LEDINDICATORS
SPACE HEATER DEMAND
DHW DEMAND
ZONE 1
ZONE 2 ZONE 3 ZONE 4 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
ACCESSORYPORT
PRIORITY
X X
FUSE5 AMP
FUSE5 AMP
Powered fromTransformer A
Powered fromTransformer B
A
B
MOD-CONBOILER
DHW PUMPOUTPUT
(NOT USED)
SPA
CE
HEA
TIN
GPU
MP
OU
TPU
T
120 VACINPUT
HNSPACE HEATING
PUMP
Powered fromTransformer A
Powered fromTransformer B
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
53
TEKM
AR C
omm
unic
atio
n Th
erm
osta
t (TN
4) C
onne
cted
to S
R504
-EXP
Swi
tchi
ng R
elay
TEKM
AR
USE
R SW
ITC
H(O
PTIO
NA
L)
TO: “
TT”
ON
BO
ILER
BOIL
ER
H N
TO: “
TT”
ON
BO
ILER
WIT
HD
HW
“TT
” IN
PUT
R W
C tn
4
R W
C tn
4
R W
C tn
4
R W
C tn
4
tn4 RC
120
VAC
INPU
T
PRIM
ARY
CIR
CU
LATO
R(O
PTIO
NA
L)
FOU
R Z
ON
EEX
PAN
DA
BLE
SWIT
CH
ING
REL
AY
POW
ERC
ON
TRO
LS
120
VAC
CIR
CU
LATO
RSZ
C
INPU
T12
0 VA
C
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E1 Z
ON
E2 Z
ON
E3
SR 5
04-E
XP-
4
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
FUSE
6 AM
PFU
SE6
AMP
NET
EXPA
NSI
ON
MAI
NPR
IORI
TY
XX
XX
AB
CR
WC
RW
CR
WC
RW
C1
2
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
N/C
PRIM
ARY
120
VAC
ZR
HH
NH
NH
NH
NH
NH
NH
NH
SLA
VE
PR
IOR
ITY
ON
RE
SE
T
PR
IMA
RY
PU
MP
ON
PO
ST
PU
RG
E O
N
PR
IOR
ITY
PR
OTE
CT
ON
PU
MP
EX
ER
CIS
E O
N
30 S
EC
/2 W
K
MA
STE
R
OFF
OFF
OFF
OFF
OFF
NO
RM
AL
LOW
LIM
IT (Z
C) O
NO
FF
4 M
IN/2
4 H
OU
R
ZON
E4ZO
NE4
PRIO
RITY
AC
CES
SORY
PORT
ZO
NE
2
POW
ER
ZO
NE
1
ZO
NE
3
ZO
NE
4
LED
IND
ICA
TORS
54
TEKM
AR C
omm
unic
atio
n Th
erm
osta
t (TN
4) C
onne
cted
to Z
VC40
4-EX
P Zo
ne V
alve
Con
trol
12
34
ZO
NE
11
23
4Z
ON
E 2
12
34
ZO
NE
31
23
4Z
ON
E 4
PRIO
RITY
ZO
NE
2 W
IRE
ZO
NE
VALV
E(N
O E
ND
SW
ITC
H)
MU
ST U
SE JU
MPE
R
TAC
O3
WIR
EZ
ON
E VA
LVE
1 2 3
JUM
PER
3 &
4
MO
TOR
END
SWIT
CH
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
,SE
LF C
LOSI
NG
)
JUM
PER
3 &
4
POW
ERC
ON
TRO
LS
SE
E N
OTE
2
ZV
C 4
04-E
XP-
4FO
UR
ZO
NE
EXPA
ND
AB
LEZ
ON
E V
ALV
E C
ON
TRO
L
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
POWER IN24 VAC
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
DRY
CO
NTA
CTS
N/O
CO
MN
/C
PUM
P EN
DSW
ITC
HZ
ON
E 4
PUM
PEN
D S
WIT
CH
SLA
VE
PR
IOR
ITY
ON
RE
SE
TP
OS
T P
UR
GE
ON
PR
IOR
ITY
PR
OTE
CTI
ON
ON
PU
MP
EX
ER
CIS
E O
N30
SE
C/2
WK
MA
STE
RO
FFN
OR
MA
LO
FFO
FFO
FF4
MIN
/24
HO
UR
NO
TE
2:
Whe
n a
circ
ulat
or is
use
don
the
prio
rity
zone
inst
ead
of a
zone
val
ve, j
ump
er 3
and
4 o
fth
e p
riorit
y zo
ne.
TEKM
AR
USE
RSW
ITC
H
T ST
AT
1VA
LVE
1
T ST
AT
2VA
LVE
2
T ST
AT
3VA
LVE
3
T ST
AT
4VA
LVE
4
POW
ER
LED
IND
ICA
TORS
TO: “
TT”
ON
BO
ILER
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
NET
EXPA
NSI
ON
MAI
NPR
IORI
TY
XX
XX
AB
CR
WC
RW
CR
WC
RW
C1
2
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
24 V
AC
ZO
NE
VALV
ES
AC
CES
SORY
PORT
PRIO
RITY
XXFU
SE5
AM
P
FUSE
5 A
MP
Pow
ered
from
Tran
sfor
mer
APo
wer
ed fr
omTr
ansf
orm
er B
A B
BOIL
ER
120
VA
CIN
PUTH
NSY
STEM
PU
MP
Pow
ered
from
Tran
sfor
mer
APo
wer
ed fr
omTr
ansf
orm
er B
TO: “
TT”
ON
BO
ILER
WIT
HD
HW
“TT
” IN
PUT
R W
C tn
4
R W
C tn
4
R W
C tn
4
R W
C tn
4
tn4 RC
55
SR503-EXP Switching Relay Controlling a Standard (Non-Expandable) Switching Relay
120 VOLT CIRCULATORSZC ZR
X XISOLATED
END SWITCH
120 VOLTINPUT
120 VAC INPUTTO: "TT" ON BOILER
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6PRIORITY
REMOVEJUMPER
H N H N H N H N H N H N
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6PRIORITY
SPAREFUSE
120V RELAY
SPAREFUSE
SIX ZONESWITCHING RELAY WITH PRIORITY
ZONE 6PRIORITY
ONOFF
N H
SR 506
24 VACPOWER
120 VAC INPUT
TO: "TT" ON BOILER
TO: "TT" ON BOILER WITH DHW "TT" INPUT
THREE ZONEEXPANDABLE SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORS
ZC INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3
ZONE1 ZONE2
THERMOSTATS (24 VAC)
SR 503-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C 1 2
END SWITCH THERMOSTATS
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE3 ZONE3
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
LEDINDICATORS
THERMOSTATS(24 VAC)
BOILER
MASTER
SLAVE
AQUASTAT ONDHW HEATERA
H
N
(EXISTING CONTROL)
PRIMARY SYSTEMCIRCULATOR(OPTIONAL)
56
ZVC404-EXP Zone Valve Control Controlling a Standard (Non-Expandable) Switching Relay
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
PRIORITYZONE
2 WIREZONE VALVE
(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIREZONE VALVE
(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
POWERCONTROLS
SEE NOTE 2
ZVC 404-EXP-4FOUR ZONE EXPANDABLE
ZONE VALVE CONTROL
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
POW
ER IN
24 V
AC
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
N/O COM N/C
PUMP ENDSWITCH
ZONE 4 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
NOTE 2: When a circulator is usedon the priority zone instead of azone valve, jumper 3 and 4 ofthe priority zone.
THERMOSTATS (24 VAC)
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
POWER
LEDINDICATORS
ZONE 1
ZONE 2 ZONE 3 ZONE 4 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
ACCESSORYPORT
PRIORITY
X X
FUSE5 AMP
FUSE5 AMP
Powered fromTransformer A
Powered fromTransformer B
A
B
ZONEVALVEPUMP
Powered fromTransformer A
Powered fromTransformer B
120 VOLT CIRCULATORSZC ZR
X XISOLATED
END SWITCH
120 VOLTINPUT
120 VACINPUT
TO: "TT" ON BOILER
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6PRIORITY
REMOVEJUMPER
H N H N H N H N H N H N
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6PRIORITY
SPAREFUSE
120V RELAY
SPAREFUSE
SIX ZONESWITCHING RELAY WITH PRIORITY
ZONE 6PRIORITY
ONOFF
N H
SR 506
24 VACPOWER
120 VAC INPUT
THERMOSTATS(24 VAC)
BOILER
SLAVE
HN
(EXISTING CONTROL)
PRIORITYOFF
MASTERTO: “TT” ON BOILER
TO: “TT” ON BOILER WITHDHW “TT” INPUT
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
57
ZVC404-EXP Zone Valve Control Controlling a Standard (Non-Expandable) Zone Valve Control
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
PRIORITYZONE
2 WIREZONE VALVE
(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIREZONE VALVE
(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
POWERCONTROLS
SEE NOTE 2
ZVC 404-EXP-4FOUR ZONE EXPANDABLE
ZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
PUMP ENDSWITCH
ZONE 4 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
NOTE 2: When a circulator is usedon the priority zone instead of azone valve, jumper 3 and 4 ofthe priority zone.
THERMOSTATS (24 VAC)
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
POWER
LEDINDICATORS
ZONE 1
ZONE 2 ZONE 3 ZONE 4 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
ACCESSORYPORT
PRIORITY
X X
FUSE5 AMP
FUSE5 AMP
Powered fromTransformer A
Powered fromTransformer B
A
B
ZONE VALVE PUMP(MASTER)
Powered fromTransformer A
Powered fromTransformer B
BOILER
SLAVE (EXISTING CONTROL)
MASTERTO: “TT” ON BOILER
TO: “TT” ON BOILER WITHDHW “TT” INPUT
POWER IN
ZONE 2 ZONE 3 ZONE 4
MODENORMAL RESET
FUSE (3 A
MP M
AX
)
ZONE 1T T T T T T T T
ZONE 4 PRIORITYOFF
ON
N/O COM N/CZONE 4 RELAY
DRYCONTACTS
1 2 3 4 1 2 3 4ZONE 1 ZONE 2
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
1 2 3 4ZONE 3
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
T STAT 1
VALVE 1T STAT 2VALVE 2T STAT 3
VALVE 3T STAT 4VALVE 4POWER
ENDSWITCH
EXTRAEND
SWITCH
MAIN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZVC 404
FOUR ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
1 2 3 4ZONE 4
PRIORITYZONE
JUMPER3 & 4
SEE NOTE 2
THERMOSTATS (24 VAC)
120 VACINPUT
HN
NOTE 2: When a circulator is usedon the priority zone instead of azone valve, jumper 3 and 4 ofthe priority zone.
PRIORITYON
ZONE VALVE PUMP(SLAVE)
TO: “TT” ON BOILER
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
24 VAC
24 VAC
120 VACINPUT
WHITE
BLACK
120 VACINPUT
WHITE
BLACK
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
58
3 Wire Thermostat Connected to TACO Non-Expandable Switching Relay
TO: "TT" ON BOILER
HN
120 VACINPUT
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
SR 504-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
X X R W R W R W R WISOLATED
ENDSWITCH THERMOSTATS (24 VAC)
PRIORITY120 VACZR
H H N H N H N H N H N HZONE4
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LEDINDICATORS
ZONE 4PRIORITY
OFF
ON
PRIORITY
24 VAC
COM
BOILER
JUMPER
T
T
T
THERMOSTATS
T
3 WIRETHERMOSTAT
COM
570 Zone Valve Connected to TACO Switching Relay
T
1
2
3
24 VACTRANSFORMER
THERMOSTAT
120 VAC INPUT
THREE ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3PRIORITY
ZONE1 ZONE2 ZONE3PRIORITY
SR 503-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
X X R W R W R WISOLATED
ENDSWITCH THERMOSTATS (24 VAC)
120 VAC
ZR
H H N H N H N H N H
ZONE 2
POWER
ZONE 1
ZONE 3
LEDINDICATORS
ZONE 3PRIORITY
OFF
ON
TO: "TT" ON AQUASTAT CONTROL
24 VAC
COM
JUMPER
59
Whi
te-R
oger
s 13
61 H
ydro
nic
Zone
Val
ve w
ith T
ACO
Zone
Val
ve C
ontro
l
12
34
ZO
NE
11
23
4Z
ON
E 2
12
34
ZO
NE
31
23
4Z
ON
E 4
12
34
ZO
NE
5
PRIO
RITY
ZO
NE
WH
ITE-
ROG
ERS
1361
HYD
RON
ICZ
ON
E VA
LVE
3 W
IRE
ZO
NE
VALV
E(T
AC
O T
YPE)
1 2 3
MO
TOR
END
SWIT
CH
4 W
IRE
ZO
NE
VALV
E(H
ON
EYW
ELL
TYPE
)
JUM
PER
3 &
4
ZV
C 4
05 –
4
FIVE
ZO
NE
ZO
NE
VALV
E C
ON
TRO
L
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
POWER IN24 VAC
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
TOC
IRC
ULA
TOR
DRY
CO
NTA
CTS
N/O
CO
MN
/C
PUM
P EN
DSW
ITC
H
FUSE
5 A
MP Z
ON
E 5
PUM
PEN
D S
WIT
CH
T ST
AT
1VA
LVE
1
T ST
AT
2VA
LVE
2
T ST
AT
3VA
LVE
3
T ST
AT
4VA
LVE
4
VALV
E 5
POW
ER
LED
IND
ICA
TORS
T ST
AT
5
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E 5
ISO
LATE
DX
XR
W
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
24 V
AC
ZO
NE
VALV
ESPR
IORI
TY
T T
XX
ZO
NE
5PR
IORI
TY OFF
ON
NO
TE
2:
Whe
n a
circ
ulat
oris
use
d o
n th
e p
riorit
y zo
nein
stea
d o
f a z
one
valv
e,ju
mp
er 3
and
4 o
f the
prio
rity
zone
.
THER
MO
STA
TS (
24VA
C)
RW
RW
RW
CC
CR
WC
C
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
FUSE
5 A
MP
Pow
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from
Tra
nsfo
rmer
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wer
ed fr
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rans
form
er B
A B
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ered
from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
12
34
TO: “
TT”
ON
BO
ILER
OR
PUM
P RE
LAY
BLACK
BLACK
RED
RED
“R”
TTSC
REW
(SEE
NO
TE)
NO
TE:
THE
WR
1361
ZO
NE
VALV
E W
ILL
ON
LY W
ORK
WIT
H A
TA
CO
ZVC
WH
EN P
RIO
RITY
SW
ITC
H
IS
TU
RNED
OFF
.
T
TT
TE
RM
INA
L A
SS
IGN
ME
NT
ZO
NE
VA
LVE
CO
NT
RO
L1 2 3 4
1TT
“R
”3 2
60
Hone
ywel
l VC
40 &
80
(spd
t) Hy
dron
ic Z
one
Valve
with
TAC
O Zo
ne V
alve
Con
trol
12
34
ZO
NE
11
23
4Z
ON
E 2
12
34
ZO
NE
31
23
4Z
ON
E 4
12
34
ZO
NE
5
PRIO
RITY
ZO
NE
HO
NEY
WEL
L VC
(SP
ST)
HYD
RON
IC Z
ON
E VA
LVE
SERI
ES 4
0 &
80
3 W
IRE
ZO
NE
VALV
E(T
AC
O T
YPE)
1 2 3
MO
TOR
END
SWIT
CH
4 W
IRE
ZO
NE
VALV
E(H
ON
EYW
ELL
TYPE
)
JUM
PER
3 &
4
ZV
C 4
05 –
4
FIVE
ZO
NE
ZO
NE
VALV
E C
ON
TRO
L
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
POWER IN24 VAC
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
TOC
IRC
ULA
TOR
DRY
CO
NTA
CTS
N/O
CO
MN
/C
PUM
P EN
DSW
ITC
H
FUSE
5 A
MP Z
ON
E 5
PUM
PEN
D S
WIT
CH
T ST
AT
1VA
LVE
1
T ST
AT
2VA
LVE
2
T ST
AT
3VA
LVE
3
T ST
AT
4VA
LVE
4
VALV
E 5
POW
ER
LED
IND
ICA
TORS
T ST
AT
5
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E 5
ISO
LATE
DX
XR
W
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
24 V
AC
ZO
NE
VALV
ESPR
IORI
TY
T T
XX
ZO
NE
5PR
IORI
TY OFF
ON
NO
TE
2:
Whe
n a
circ
ulat
oris
use
d o
n th
e p
riorit
y zo
nein
stea
d o
f a z
one
valv
e,ju
mp
er 3
and
4 o
f the
prio
rity
zone
.
THER
MO
STA
TS (
24VA
C)
RW
RW
RW
CC
CR
WC
C
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
FUSE
5 A
MP
Pow
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from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
A B
Pow
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from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
62
14
TO: “
TT”
ON
BO
ILER
OR
PUM
P RE
LAY
BLACK
BLACK
RED
RED
“R”
TTSC
REW
(SEE
NO
TE)
T
TT
TE
RM
INA
L A
SS
IGN
ME
NT
ZO
NE
VA
LVE
CO
NT
RO
L1 2 3 4
3 1TT
“R
”4
3
OR
AN
GE
BLU
EB
RO
WN
GR
AY6
2B
LAC
K
NO
TE:
THE
HO
NEY
WEL
L VC
40
& 8
0 Z
ON
E VA
LVE
WIL
L O
NLY
WO
RK W
ITH
A T
AC
O Z
VC W
HEN
PRIO
RITY
SW
ITC
H IS
TU
RNED
OFF
.
61
Zone
Val
ve C
ontro
l with
1 L
ow T
empe
ratu
re Z
one
Usin
g Pr
iorit
y Zo
ning
Circ
ulat
or
BO
ILE
R
HN
SYST
EMPU
MP
SYST
EM P
UM
P A
ND
BO
ILER
TURN
ON
WH
EN A
NY
ZO
NE
VALV
E O
PEN
S.
12
34
ZO
NE
11
23
4Z
ON
E 2
12
34
ZO
NE
31
23
4Z
ON
E 4
12
34
ZO
NE
51
23
4Z
ON
E 6
PRIO
RITY
ZO
NE
TAC
O3
WIR
EZ
ON
E VA
LVE
1 2 3
JUM
PER
3 &
4
MO
TOR
END
SWIT
CH
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
,SE
LF C
LOSI
NG
)
JUM
PER
3 &
4
ZV
C 4
06 –
4
SIX
ZO
NE
ZO
NE
VALV
E C
ON
TRO
L
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
POWER IN24 VAC
24
VAC
FACTORYINSTALLED
TRANSFORMER
120
VA
CIN
PUT
WH
ITE
BLA
CK
DRY
CO
NTA
CTS
N/O
CO
MN
/C
PUM
P EN
DSW
ITC
HZ
ON
E 6
PUM
PEN
D S
WIT
CH
THER
MO
STA
TS (
24VA
C)
T ST
AT
1VA
LVE
1
T ST
AT
2VA
LVE
2
T ST
AT
3VA
LVE
3
T ST
AT
4VA
LVE
4
VALV
E 5
T ST
AT
6VA
LVE
6
POW
ER
LED
IND
ICA
TORS
T ST
AT
5
TO: B
OIL
ER A
QU
AST
AT
RELA
Y
ZON
E 1
ZON
E 2
ZON
E 3
ZON
E 4
ZON
E 5
ZON
E 6
ISO
LATE
DX
X
END
SW
ITC
HTH
ERM
OST
ATS
(24
VA
C)
PRIO
RITY
24 V
AC
ZO
NE
VA
LVES
PRIO
RITY
XX
ZO
NE
6PR
IORI
TY OFF
ON
NO
TE
2:
Whe
n a
circ
ulat
oris
use
d o
n th
e p
riorit
y zo
nein
stea
d o
f a z
one
valv
e,ju
mp
er 3
and
4 o
f the
prio
rity
zone
.
FUSE
5 A
MP
RW
IND
IREC
TW
ATE
R H
EATE
RA
QU
AST
AT
OR
THER
MO
STA
T
See N
OT
E 1
RW
RW
RW
CC
CR
WC
C
FUSE
5 A
MP
RW
C
NO
TE
1:
Term
inal
s C
are
for
optio
nal 2
4V t
herm
osta
tC
OM
MO
N c
onne
ctio
ns.
Pow
ered
from
Tra
nsfo
rmer
APo
wer
ed fr
om T
rans
form
er B
A B
Pow
ered
from
Tra
nsfo
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APo
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rans
form
er B
TT
T
PRIO
RITY
ON
PPRIORITYPOWER IN
H
(on)
MA
STER
CIR
C.
ON
RW
XX
RC
THER
MO
-ST
AT
END
SWIT
CH
24 V
AC
POW
ER
N
PRIO
RIT
Y Z
ON
ING
CIR
CU
LATO
R
MO
TOR
END
SWIT
CH
4 W
IRE
ZO
NE
VALV
E(P
OW
ER O
PEN
,SE
LF C
LOSI
NG
) 1
20 V
AC
INPU
T
Back ofControl
MENU ITEM
RADIANT MIXING BLOCK
PATENT PENDING RMB-1UL
Power: 120 V + 10%50/60 Hz, 750 VAVar. Speed: 120 V(ac) 1 APmp Relay: 120 V(ac) 5 A, 1/6 hp
Use copperconductors only
Meets Class B:Canadian ICESFCC Part 15
Com SysRet
Boil Out HeatDem
Boiler
HN
C US158033
Com Com
Sys
Y R BMan
R
SupplySensor
BoilerSensor
OutdoorSensor
Boiler
InjectionCirculator
RadiantCirculator
Line Cord
To Zone
Control End
Switchor
Thermostat
Off-Enable On-ControlBoiler Operation
Sup
Var
Pump
Fuse
Front ofControl
SupplySensor
Boiler Sensor
Outdoor
SensorH
N
ComSup Boil Out HeatDem
Com Com
Boiler
SysRet
RMBBack of Control
H
N
Power
Input
Thermostat
(Dry Contact)
N
Off-Enable On-ControlBoiler Operation
Pump
High Mass Boiler
T
Radiant Mixing Block, Single Zone
Radiant Mixing Block (RMB)
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard62
Radiant Mixing Block Connected to Zone Valve Control with System Pump Wired off the RMB
Radiant Mixing Block Connected to 2 EXP Switching Relays with DHW Pump
SupplySensor
Boiler Sensor
MM
H
N
Com Sup Boil Out HeatDem
Com Com
Boiler
SysRet
RMBBack of Control
Power
Input
N
Off-Enable On-ControlBoiler Operation
Fact
ory
Inst
alle
dTr
ansf
orm
er
Pump
Outdoor
Sensor
H
N
Moto
r
End S
witch
Moto
r
End S
witch
Boiler Sensor
SupplySensor
H
N
ComSup Boil Out HeatDem
Com Com
Boiler
SysRet
RMBBack of Control
Off-Enable On-ControlBoiler Operation
Power Cord
Pump
HN
Power
Input
DHWCirc.
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
PRIORITYZONE
JUMPER3 & 4
ZVC 403 – 4
THREE ZONEZONE VALVE CONTROL
WHITE
BLACK
POW
ER IN
24 V
AC
TOCIRCULATOR
DRYCONTACTS
N/O COM N/C
PUMP ENDSWITCH
FUSE
5 A
MP
ZONE 3 PUMPEND SWITCH
THERMOSTATS (24VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
POWER
LEDINDICATORS
ZONE 1 ZONE 2 ZONE 3ISOLATEDX X R W R W R W
END SWITCH THERMOSTATS PRIORITY
24 VAC ZONE VALVES PRIORITY
X X
ZONE 3PRIORITY
OFF
ON
NOTE 2: When a circulator isused on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
C C C
THREE ZONEEXPANDABLE
SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORS
ZC INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3
ZONE1 ZONE2
THERMOSTATS(24 VAC)
SR 503-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C 1 2
END SWITCH THERMOSTATS
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE3 ZONE3
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
LEDINDICATORS
TT
T
T
THREE ZONEEXPANDABLE
SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORS
ZC INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3
ZONE1 ZONE2
THERMOSTATS(24 VAC)
SR 503-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C 1 2
END SWITCH THERMOSTATS
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE3 ZONE3
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
LEDINDICATORS
T
T
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
OutdoorSensor
MASTER
SLAVE
See NOTE 1
See NOTE 1
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard63
Back ofControl
MENU ITEM
X – PUMP BLOCK
PATENT PENDING XPB-1UL
Power: 120 V + 10%50/60 Hz, 750 VAVar. Speed: 120 V(ac) 1 APmp Relay: 120 V(ac) 5 A, 1/6 hp
Use copperconductors only
Meets Class B:Canadian ICESFCC Part 15
Com SysRet
Boil Out HeatDem
BoilerHN
C US158033
Com Com
Sys
Y R BMan
R
SystemSupplySensor
HeatSourceSensor
OutdoorSensor
Heat Source
Variable Speed CirculatorHeating: Heat Source CirculatorSnowmelt: System Circulator
Constant Speed CirculatorHeating: System CirculatorSnowmelt: Heat Source Circulator
Line Cord
To Zone
Control End Switch
or Thermostat
(Relay orMechanical
Type)
Off-Enable On-ControlBoiler Operation
Sup
Var
Pump
Fuse
Front ofControl
ManualOperationSwitch
X - Pump Block, Single Zone
Input from
Heat Source
Output to
System
HEAT
SOURCE Supply
Sensor
Exp
Tank
Pressure
Relief
H
N
ComSup Boil Out HeatDem
Com ComSysRet
XPBBack of Control
Off-Enable On-Control
Boiler Operation
Power
Cord
Thermostat
(Relay or Mechanical Type)Pump
Outdoor
Sensor
Boiler
T
X - Pump Block (XPB)
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard64
65
H
N
ComSup Boil Out HeatDem
Com ComSysRet
Power
Cord
Radiant Manifold - Supply
Radiant Manifold - Return
X - Pump Block Connected to Zone Valve Control
Output to
System
Exp
Tank
Pressure
Relief
Supply
Sensor
XPBBack of Control
Off-Enable On-ControlBoiler Operation
Pump
Outdoor
Sensor
Boiler
HEAT
SOURCEInput from
Heat Source
H
N
ComSup Boil Out HeatDem
Com ComSysRet
PowerInput
Power
Cord
Input fromHeat Source
Output to System
SupplySensor
ReturnSensor
ExpTank
PressureRelief
X - Pump Block Connected to 2 SR502/503 Switching Relays
XPBBack of Control
Off-Enable On-ControlBoiler Operation
Pump
Outdoor
Sensor
Boiler
H
N
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
PRIORITYZONE
JUMPER3 & 4
ZVC 404 – 4
FOUR ZONEZONE VALVE CONTROL
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK POW
ER IN
24 V
AC
TOCIRCULATOR
DRYCONTACTS
N/O COM N/C
PUMP ENDSWITCH
FUSE
5 A
MP
ZONE 4 PUMPEND SWITCH
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
POWER
LEDINDICATORS
ZONE 1 ZONE 2 ZONE 3 ZONE 4ISOLATEDX X
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES PRIORITY
X X
ZONE 4PRIORITY
OFF
ON
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
THERMOSTATS (24VAC)
R W R W R WC C C
See NOTE 1
R W C
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
HN
PRIORITYOFF
T T T
TTTHERMOSTATS
TWO ZONE SWITCHING RELAY
CIRCULATORS
ZC INPUT
120 VAC
ZONE 1 ZONE 2PRIORITY
ZONE1 ZONE2
PRIORITY
SR 502-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
X X R W R WISOLATED
ENDSWITCH THERMOSTATS
120 VAC
ZR
H H N H N H N H
ZONE 2
POWER
ZONE 1
LEDINDICATORS
ZONE 2PRIORITY
OFF
ON24 VAC
COM
PRIORITYOFF
Power
Input
H
N
TT
THERMOSTATS
TWO ZONE SWITCHING RELAY
CIRCULATORS
ZC INPUT
120 VAC
ZONE 1 ZONE 2PRIORITY
ZONE1 ZONE2
PRIORITY
SR 502-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
X X R W R WISOLATED
ENDSWITCH THERMOSTATS
120 VAC
ZR
H H N H N H N H
ZONE 2
POWER
ZONE 1
LEDINDICATORS
ZONE 2PRIORITY
OFF
ON24 VAC
COM
PRIORITYOFF
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard
Typical Radiant Floor to Water Heater Installation
ColdSupply
MIXH
C
ASSE 1017Tempering
Valve
DomesticHot
Supply
RADIANTSYSTEM
(Secondary Sideof the System)
X-PUMPBLOCK
ColdHot
WATERHEATER
CheckValve
Supply
Return
Exp.Tank
ReliefValve
AirSeparator
WARNING! A pressure relief valve and expansion tank must be installed on the secondaryside in addition to any pressure relief valve and expansion tank which is installed on primaryside of system. Use dedicated supply and return piping to the X-Pump Block from the waterheater so as not to add heated water into the house’s cold water piping.
Typical Snow Melt Installation
SNOW MELTSYSTEM
X-PUMPBLOCK
Supply
Return
Exp.Tank
ReliefValve
AirSeparator
Exp.Tank
Separator
FIXED SPEEDCIRCULATOR(4 PIN PLUG)
VARIABLE SPEEDCIRCULATOR(3 PIN PLUG)
HEATSOURCE
(Tb)
(Ts)
Note 1: There must be no more than 4 pipe diameters between the tees in the boiler andsystem loops in order to prevent ghost flow when the variable speed injectionpump is off and either the boiler pump or system pump is on.
Note 2: There must be at least 6 pipe diameters of straight pipe on either side of the tees inorder to prevent the momentum of water in the boiler and system loops from pushingflow through the injection loop.
Note 3: There should be a minimum 1 foot drop to create a thermal trap in order to preventconvective heat transfer through the injection loop.
(ΔTs)
{Note 1 Note 2
Not
e 3
{
{
Not
e 3
{
Not
e 2
{
Not
e 1
}
HEAT SOURCERETURN SENSOR
(OPTIONAL)
SYSTEMSUPPLYSENSOR
SYSTEMRETURNSENSOR
Tb = Boiler Supply Temperature
Ts = System Supply Temperature
ΔTs = System Temperature Drop(typically 20°F for convectorsand 10°F for radiant floor heating)
66
67
Back ofControl
iSeries-R
BA
24 Volt
Transformer
N
H Power
Input
C R
24 VACPOWER INPUT
SENSOR COMMON
BOILER SUPPLY OUTDOOR
POWERGREEN
SENSORERROR
RED
BACK OF iVALVE-R MIXING VALVE ACTUATOR
iValve, 2-Way Injection, Single Zone
Outdoor
Sensor
Supply
SensorBoiler
Sensor
T
EndSwitch
OutdoorSensor
SystemSupplySensor
BoilerReturnSensor
SENSOR COMMON
C R
24 VACPOWER INPUT
BOILERPOWERGREEN
SENSORERROR
RED
SUPPLY
OUTDOOR
iSeries Mixing Valve
iValve-R
SystemSupplySensor
BoilerReturnSensor(optional)
24 V (ac)Transformer
(Constant Power)
iValve-S
or
Back ofControl
EndSwitch
SENSOR COMMON
C R
24 VACPOWER INPUT
BOILERPOWERGREEN
SENSORERROR
RED
SUPPLY
SETBACK
24 V (ac)Transformer
(Constant Power)
orSetback
Input
ONE ZONESWITCHING RELAY
SR 501-4
FUSE6 AMP
POWER
ZONE 1
LEDINDICATORS
FUSE6 AMP
N H 3 4 4 56 6N/O N/ON/C N/CCOM COM
120 VACINPUT
T T COM
R W 24VAC
THERMOSTAT
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard
iSe
ries-R
BC
A
BC
ASupply
Sensor
H N
Power
Input
C R
24 VACPOWER INPUT
SENSOR COMMON
BOILER SUPPLY OUTDOOR
POWERGREEN
SENSORERROR
RED
BACK OF iVALVE-R MIXING VALVE ACTUATOR
DHWCirc.
iValve, 3-Way Mixing Working with SR502/503 Switching Relay with DHW Priority
24 V
olt
Tran
sfor
mer
C R
24 VACPOWER INPUT
SENSOR COMMON
BOILER SUPPLY OUTDOOR
POWERGREEN
SENSORERROR
RED
BACK OF iVALVE-R MIXING VALVE ACTUATOR
MM
H
N
iValve, 4-Way Mixing Working with Zone Valve Control
iSeries-R
Fact
ory
Inst
alle
dTr
ansf
orm
er
T T
Mot
or
End
Sw
itch
Mot
or
End
Sw
itch
PowerInput
OutdoorSensor
BoilerSensor
SupplySensor
Boiler
Sensor
THREE ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3PRIORITY
ZONE1 ZONE2 ZONE3
PRIORITY
SR 503-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
X X R W R W R WISOLATED
ENDSWITCH THERMOSTATS (24 VAC)
120 VAC
ZR
H H N H N H N H N H
ZONE 2
POWER
ZONE 1
ZONE 3
LEDINDICATORS
ZONE 3PRIORITY
OFF
ON24 VAC
COM
24 V
olt
Tran
sfor
mer
OutdoorSensor
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
PRIORITYZONE
JUMPER3 & 4
ZVC 403 – 4
THREE ZONEZONE VALVE CONTROL
POW
ER IN
24 V
AC
TOCIRCULATOR
N/O COM N/C
PUMP ENDSWITCH
FUSE
5 A
MP
ZONE 3 PUMPEND SWITCH
THERMOSTATS (24VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
POWER
LEDINDICATORS
ZONE 1 ZONE 2 ZONE 3ISOLATEDX X R W R W R W
END SWITCH THERMOSTATS PRIORITY
24 VAC ZONE VALVES PRIORITY
X X
ZONE 3PRIORITY
OFF
ON
NOTE 2: When a circulator isused on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
C C C
See NOTE 1
T T
24 VAC
WHITE
BLACK
THERMOSTATS(24VAC)
INDIRECTWATER HEATERAQUATSTAT ORTHERMOSTAT
See NOTE 2
FOR ADDITIONAL WIRING DIAGRAMS, PLEASE SEE www.taco-hvac.com/wiringwizard68
69
Wiring for Boilers with Honeywell Control Center Model R8285 or Equivalent
TACO LTR0243T-1
YELREDWH YELGRNFACTORYWIRING
MALECONNECTOR
GROUNDCONNECTION
FEMALECONNECTOR
GASVALVE
120VAC
TACO LTR0243T-1
YELREDWH YELGRN
LIMITCONTROLS
24 VACCLASS 2
TRANSFORMER
24 VAC
HOT
COMMON
AlternateWiring
INTEGRATED BOILERCONTROL
BOILER MODULEWIRING HARNESS
MALECONNECTOR
FEMALECONNECTOR
FACTORY WIRING
Wiring Boilers with a United Technologies Integrated Control Module and a Taco LTR0243U-1
Wiring Boilers with a United Technologies Ucontrol or other Integrated Control Moduleswhich accept a 4-pin harness and a Taco LTR0243L-1
4-PIN CONNECTOR (#2)
4-PIN CONNECTOR (#1)
WIRING HARNESS
INTEGRATEDCONTROLMODULE
Wiring Instructions
1. Plug the 4-pin connector on the wiring harness (#1 as shown) into the integrated control module.
2. Plug the 4-pin connector on the wiring harness (#2 as shown) into the LTR.
70
71
Wiring Taco LN and LTA-2 Series Low Water CutoffsUsing Burner Circuit Power Source
*
*Factory Installed
Wiring Taco LN and LTA-2 Series Low Water CutoffsUsing Power Source Other Than Burner Circuit
NOTE: For 24 VAC models, LNA024xx and LTA0243S-2, 24 VAC tobe supplied by an EXTERNAL Class 2 power source to terminalsH and N. For 120 VAC models, LNA120xx and LTA1203S-2, 120 VACis supplied by an external circuit to terminals H and N.
NOTE: For 24 VAC models, LNA024xx and LTA0243S-2, 24 VAC tobe supplied by an EXTERNAL Class 2 power source to terminalsH and N. For 120 VAC models, LNA120xx and LTA1203S-2, 120 VACis supplied by an external circuit to terminals H and N.
Wiring Taco LT Series (1st generation, -1) Low Water CutoffsUsing Burner Circuit Power Source
**Factory Installed
Wiring Taco LT Series (1st generation, -1) Low Water CutoffsUsing Power Source Other Than Burner Circuit
NOTE: For 24 VAC models, LTx024xx-1, 24 VAC to be suppliedby an EXTERNAL Class 2 power source to terminals H and N.For 120 VAC models, LTx120xx-1, 120 VAC is supplied by anexternal circuit to terminals H and N.
NOTE: For 24 VAC models, LTx024xx-1, 24 VAC to be suppliedby an EXTERNAL Class 2 power source to terminals H and N.For 120 VAC models, LTx120xx-1, 120 VAC is supplied by anexternal circuit to terminals H and N.
72
73
Wiring Taco LF Series Low Water Cutoffs Using Burner Circuit Power Source
Wiring Taco LF Series Low Water Cutoffs Using Power Source Other Than Burner Circuit
NOTE: Remote probe available on remote probe models only.
NOTE: For 24 VAC models, LFx024xx, 24 VAC to be supplied by an EXTERNAL Class 2 power source to terminals H and N.For 120 VAC models, LFx120xx, 120 VAC is supplied by an external circuit to terminals H and N.
NOTE: For 24 VAC models, LFx024xx, 24 VAC to be supplied by an EXTERNAL Class 2 power source to terminals H and N.For 120 VAC models, LFx120xx, 120 VAC is supplied by an external circuit to terminals H and N.
Taco Low Water Cutoff Replacement Guide
Bold / Italics Indicates Discontinued Part Number
Taco McDonnell & Miller Hydrolevel Honeywell
LFA1203S-1LTA1203N-1LTA1203S-1
PS-801-120PS-800-120PS-850-120900900C
450CG450650650SVOEM170COEM170TD
RW700A1031RW700A1056RW700A1080
LFM1203S-1LTM1203N-1LTM1203S-1
PS-801-M-120PS-851-M-120PS-851-SP-M-120PS-850-M-120900M901M902M
550550SV750OEM170MCOEM170M
RW700B1054RW700B1039RW700B1021
LFA0243S-1LTA0243N-1LTA0243S-1
PS-802-24PS-800-24PS-850-24
400CG400600600SVOEM24COEM24TD
RW700A1098
LFM0243S-1LTM0243N-1LTM0243S-1
PS-802-M-24PS-852-M-24PS-852-SP-M-24PS-850-M-24
500500SV700OEM24MC
LFA1203R-1LTA1203R-1
750-T-120750-120
650R
LFM1203R-1LTM1203R-1
750-MT-120750-M-120
550R
LFA1202R-1LTA1202R-1
PS-851-RX2-120 650R
LFM1202R-1LTM1202R-1
PS-851-M-RX2-120 550R
LFA0242R-1LTA0242R-1
PS-802-RX2-24 400R
LTR0243T-1LTA0243S-2LNA0243S-1
RB-24ERB-24
24SV1100
LTA1203S-2LNA1203S-1
RB-120RB-122EPS-851-120PS-851-SP-120PS-852-24PS-852-SP-24750P-MT-120750P-MT-U-120901RB-120IIRB-122
170SV1150OEM170
RW700A1007RW700A1006
P3R-1RS-1-LPRS-1-LP-S
EWF120WF2-U-120VWF-2-120WF-4-120
VRTX-120V-120-1&2 VW400A1004
EWF024WF2-U-24VWF-2-24WF-4-24
VRTX-24V-24-1&2 VW800A1004
74
75
Taco LF Series 120 Volt LWCO Competitive Wiring Cross Reference
120 VAC Models with 120 VAC Burner Circuits
TACO LFx120x
NC COMNO H N GND P
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
McDONNELL & MILLERPS-801/851-120
w/Red & Amber LEDsSeries 750
1 2 3 4 5
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
HYDROLEVEL450, 550, 650 & 750
2 1 P1 P2 A
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
N H C W B
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
McDONNELL & MILLERPS-801/851-120
w/Red & Green LEDs
FACTORYINSTALLED
JUMPER
120 VAC Models with 24 VAC Burner Circuits
TACO LFx120x
NC COMNO H N GND P
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
McDONNELL & MILLERPS-801/851-120
w/Red & Amber LEDsSeries 750
1 2 3 4 5
HYDROLEVEL450, 550, 650 & 750
2 1 P1 P2 A
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
N H C W B
McDONNELL & MILLERPS-801/851-120
w/Red & Green LEDs
24 VACTRANSFORMER
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
Taco LF Series 24 Volt LWCO Competitive Wiring Cross Reference
24 VAC Models with 24 VAC Burner Circuits
TACO LFx024x
NC COMNO H N GND P
BURNERCIRCUIT
HOT
NEUTRAL
24 VACCIRCUIT
HYDROLEVEL400, 500, 600 & 700
2 1 P1 P2 A
BURNERCIRCUIT
HOT
NEUTRAL
24 VACCIRCUIT
N H C W B
BURNERCIRCUIT
HOT
NEUTRAL
24 VACCIRCUIT
McDONNELL & MILLERPS-802/852-24
FACTORYINSTALLED
JUMPER
24 VAC Models with 120 VAC Burner Circuits
TACO LFx024x
NC COMNO H N GND P
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
HYDROLEVEL400, 500, 600 & 700
2 1 P1 P2 A
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
N H C W B
McDONNELL & MILLERPS-802/852-24
24 VACTRANSFORMER
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
76
77
Taco LTA-2 Series 120 Volt LWCO Competitive Wiring Cross Reference
120 VAC Models with 120 VAC Burner Circuits
TACO LTA1203S-2
N H COM NC NO
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
RB-120
1 2 3 4 5
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
RB-122E
N H B C
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
GN H P1 P2 A
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
HYDROLEVEL 170McDONNELL & MILLER
FACTORYINSTALLED
JUMPER
McDONNELL & MILLER
H NCUT-OFF
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
HYDROLEVEL 1150
120 VAC Models with 24 VAC Burner Circuits
TACO LTA1203S-2
N H COM NC NO
RB-120
1 2 3 4 5
RB-122E
N H B C GN H P1 P2 A
HYDROLEVEL 170SV
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
McDONNELL & MILLER
McDONNELL & MILLER
H NCUT-OFF
HYDROLEVEL 1150
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
Taco LTR and LTA-2 Series 24 Volt LWCO Competitive Wiring Cross Reference
24 VAC Models with 24 VAC Burner Circuits
TACO LTA0243S-2
N H COM NC NO
BURNERCIRCUIT
HOT
NEUTRAL
24 VACCIRCUIT
RB-24E
BURNERCIRCUIT
HOT
NEUTRAL
24 VACCIRCUIT
HYDROLEVEL 1100
BURNERCIRCUIT
HOT
NEUTRAL
24 VACCIRCUIT
YellowWire
YellowWire
WhiteWire
RedWire
YellowWire
YellowWire
WhiteWire
RedWire
McDONNELL & MILLER
FACTORYINSTALLED
JUMPER
TACO LTR0243T-1
BURNERCIRCUIT
HOT
NEUTRAL
24 VACCIRCUIT
YellowWire
YellowWire
WhiteWire
RedWire
2 1 P1 P2 A
BURNERCIRCUIT
HOT
NEUTRAL
24 VACCIRCUIT
JUMPER
HYDROLEVEL 24
24 VAC Models with 120 VAC Burner Circuits
TACO LTA0243S-2
N H COM NC NO
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
HYDROLEVEL 24
2 1 P1 P2 A
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
78
79
Wiring Taco LF Series Low Water Cutoffsto Taco Electric Water Feeder with the Same Voltages
NC NO COM H N
T a c o L F x 1 2 0 x / L F x 0 2 4 x
GND P
B U R N E RC I R C U I T
H O T
N E U T R A L
HN
T a c o E W F 1 2 0 / E W F 0 2 4
LW
1 2 0 V A C / 2 4 V A C
C IR C U IT
EWF Standard Wiring
FACTORYINSTALLED
JUMPER
Wiring Taco LF Series Low Water Cutoffsto Taco Electric Water Feeder with Different Burner Voltages
NC NO H N
Taco L F x1 2 0 x
GND P
B UR NE RCIRC UIT 12 0 V A C
C IR C U IT
HO T
NE U TR AL
H N
Ta co E W F0 24
LW24 V AC
C IR C U IT
HO T
NE U TR AL
Taco LFx 02 4 x
B UR NE RCIRC UIT
12 0 V A CC IR C U IT
HO T
NE U TR AL
H N
Ta co E W F1 20
LW
24 V ACC IR C U IT
HO T
NE U TR AL
* *
* N O T E : R em o ve f ac tor y i n s ta lled
ju m per b etw een H and C O M te rm in a ls
EWF Alternate Wiring
NC COMNO H N GND PCOM
Wiring Taco 24VAC Electric Water Feeder to Taco LF Series 24VAC Low Water Cutoffor 24VAC McDonnell & Miller or Hydrolevel Low Water Cutoffs
Taco LFx024x
Taco EW F 024
NC H N GND P
BURNERCIRCUIT
HOT
NEUTRAL
HNLW
24 V A CC IR C U IT
21P2H ydro level400, 50 0, 600, & 700
NHB M cDo nnel l & M il l er
P S-802 /852-24
NO TE : Wiring shown only for controland burner circuits of the sam evoltage. Som e term ina l designationsare not in their actual order on theLW COs.
** May be factory installed onsom e LW COsINSTALLED
JUMPER **
COMNO
P1A
CW
Wiring Taco 120VAC Electric Water Feeder to Taco LF Series 120VAC Low Water Cutoffor 120VAC McDonnell & Miller or Hydrolevel Low Water Cutoffs
NC NO H N GND P
BURNERCIRCUIT
HOT
NEUTRAL
HNLW
120 V A CC IR C U IT
NHWBM cDo n n ell & Mill er
P S-801 /851-120w /R ed & G r een L E D s
1 245M cDo n n ell & Mill er
P S-801 /851-120 w /Red &Am be r LE D s , S eries 750
21P2 AH ydro level450, 55 0, 650, & 750
Taco LFx120x
Taco EW F 120
NO TE : Wiring shown only for controland burner circuits of the sam evoltage. Som e term ina l designationsare not in their actual order on theLW COs.
** May be factory installed onsom e LW COs
INSTALLEDJUMPER **
COM
C
3
P1
80
81
Wiring TACO LTA-2 or LF Series 24VAC Low Water Cutoff toMcDonnell & Miller Series WF2 Uni-Match Electric Water Feeder
UNI-MATCHWATER FEEDER
MODEL WF2-U-24
24VACSUPPLY
50/60 HzH
N
N H COM NC NOAC POWER OUTPUT CONTACTS
N HW
1 2 3
BURNER
SWITCH POSITION #2
M&M23
0R
Remove jumper between H and COM if using power sourceother than burner circuit or when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
Note on switch position:
Switch setting 1 (M&M), the feed cycle repeats indefinitely. Position 2 and 3 gives one feed cycle.
If using the LTA-2 series, choose whichever position best matches the application:
WF-2 switch to position 1- 60 sec. delay, 90 sec. feed, repeats
WF-2 switch to position 2- 90 sec. delay, 90 sec. feed
WF-2 switch to position 3- 100 sec. delay, 90 sec. feed
Wiring TACO LTA-2 or LF Series 120VAC Low Water Cutoff toMcDonnell & Miller Series WF2 Uni-Match Electric Water Feeder
UNI-MATCHWATER FEEDER
MODEL WF2-U-120
120VACSUPPLY
50/60 Hz H
N
N H COM NC NOAC POWER OUTPUT CONTACTS
N HW
1 2 3
BURNER
SWITCH POSITION #2
M&M23
0R
Note on switch position:
Switch setting 1 (M&M), the feed cycle repeats indefinitely. Position 2 and 3 gives one feed cycle.
If using the LTA-2 series, choose whichever position best matches the application:
WF-2 switch to position 1- 60 sec. delay, 90 sec. feed, repeats
WF-2 switch to position 2- 90 sec. delay, 90 sec. feed
WF-2 switch to position 3- 100 sec. delay, 90 sec. feed
24 VAC LWCO Using Burner Circuit Power Source
Remove jumper between H and COM if using power sourceother than burner circuit or when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
120 VAC LWCO Using Burner Circuit Power Source
Wiring TACO LF Series 24VAC Low Water Cutoff toHydrolevel VXT-24 Water Feeder (Non-Display Model)
SAFGARD VXT-24WATER FEEDER
24VACSUPPLY
50/60 Hz H
N
N H COM NC NOAC POWER OUTPUT CONTACTS
BURNER
Set Safgard as desired.
WHITE BLACK
Remove jumper between H and COM if usingpower source other than burner circuitor when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
Wiring TACO LF Series 120VAC Low Water Cutoff toHydrolevel VXT-120 Water Feeder (Non-Display Model)
SAFGARD VXT-120WATER FEEDER
120VACSUPPLY
50/60 Hz H
N
N H COM NC NOAC POWER OUTPUT CONTACTS
BURNER
Set Safgard as desired.
WHITE BLACK
24 VAC LWCO Using Burner Circuit Power Source
Remove jumper between H and COM if usingpower source other than burner circuitor when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
120 VAC LWCO Using Burner Circuit Power Source
82
83
Wiring TACO LTA-2 or LF Series 24VAC Low Water Cutoff toHydrolevel VXT-24 Programmable Water Feeder (Model with Display)
SAFGARD VRTX-24WATER FEEDER
24VACSUPPLY
50/60 Hz H
N
N H COM NC NOAC POWER OUTPUT CONTACTS
BURNER
Set Safgard as desired.
WHITE REDBLACK
Remove jumper between H and COM if usingpower source other than burner circuitor when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
Wiring TACO LTA-2 or LF Series 120VAC Low Water Cutoff toHydrolevel VXT-120 Programmable Water Feeder (Model with Display)
SAFGARD VRTX-120WATER FEEDER
120VACSUPPLY
50/60 Hz H
N
N H COM NC NOAC POWER OUTPUT CONTACTS
BURNER
Set Safgard as desired.
WHITE REDBLACK
24 VAC LWCO Using Burner Circuit Power Source
Remove jumper between H and COM if usingpower source other than burner circuitor when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
120 VAC LWCO Using Burner Circuit Power Source
Man
ufac
ture
rD
evic
e o
r S
erie
sP
ow
er C
onn
ecti
ons
Out
put
Co
ntac
tsR
emo
te P
rob
es
Ho
tN
eutr
alC
om
mo
nTo
Bur
ner
Cir
cuit
To E
WF’
s LW
Term
inal
/Ala
rmP
rob
eP
rob
eP
refe
renc
e
Taco
LF &
LT-
1 S
erie
sH
NC
OM
NC
NO
PG
ND
Taco
LTA
-2 &
LN
Ser
ies
HN
CO
MN
CN
O—
—
Taco
LTR
Ser
ies
Red
Wire
Whi
te W
ireYe
llow
Wire
Yello
w W
ire—
——
McD
onne
ll &
Mill
erP
S-8
01/8
51 (O
lder
Mod
els
w/R
ed &
Am
ber
LE
Ds)
12
35
4P
or
J2C
hass
is G
ND
McD
onne
ll &
Mill
erP
S-8
01/8
51 (N
ew M
odel
sw
/Red
& G
reen
LE
Ds)
HN
CB
WJ2
Cha
ssis
GN
D
McD
onne
ll &
Mill
erP
S-8
02/8
52 (O
lder
Mod
els
w/R
ed &
Am
ber
LE
Ds)
HN
CB
WJ7
Cha
ssis
GN
D
McD
onne
ll &
Mill
erP
S-8
02/8
52 (O
lder
Mod
els
w/R
ed &
Gre
en L
ED
s)H
NC
BW
J3C
hass
is G
ND
McD
onne
ll &
Mill
erS
erie
s 75
01
23
54
PC
hass
is G
ND
McD
onne
ll &
Mill
erR
B-1
22H
(Bla
ck W
ire)
N(W
hite
Wire
)C
(Yel
low
Wire
)B
(Yel
low
Wire
)—
——
McD
onne
ll &
Mill
erR
B-1
201
23
45
——
McD
onne
ll &
Mill
erR
B-2
4R
ed W
ireW
hite
Wire
Yello
w W
ireYe
llow
Wire
——
—
Hyd
role
vel
241
2P
1P
2A
——
Hyd
role
vel
170
HG
NP
1P
2A
——
Hyd
role
vel
1100
Red
Wire
Whi
te W
ireYe
llow
Wire
Yello
w W
ire—
——
Hyd
role
vel
1150
H(B
lack
Wire
)N
(Whi
te W
ire)
CU
T-O
FF(Y
ello
w W
ire)
CU
T-O
FF(Y
ello
w W
ire)
——
—
Hyd
role
vel
400,
500
, 60
0, 7
00,
450,
550,
650
, 75
01
2P
1P
2A
H3
Cha
ssis
GN
D
Hyd
role
vel
RW
700
Ser
ies
(Exc
ept
RW
700A
1098
)L1
L2—
BA
2 R
ed W
ires,
Whi
te W
ireG
reen
Wire
Hyd
role
vel
RW
700A
1098
T1T2
—B
A2
Red
Wire
s,W
hite
Wire
Gre
en W
ire
Taco
LTR
, LN,
LT-
1, LT
A-2
& LF
Ser
ies
Low
Wat
er C
utof
f and
Tac
o El
ectri
c W
ater
Fee
der W
iring
Cro
ss R
efer
ence
84
85
Aquastat Wiring
L1 L2 T T
L1(HOT)
L2(NEUTRAL)
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
B2 C2 B1ZR
TACOZONE
CONTROL
HONEYWELL L8124A & C OR EQUAL
120 VACINPUT
C1 ZC
END SWITCH
B1 B2 T T
L1(HOT)
L2(NEUTRAL)
CIRCULATORON BOILER
(IF ATTACHED)L1 C2L2
TACOZONE
CONTROL
HONEYWELL L8124B OR EQUAL120 VACINPUT
C
MILLI-VOLTAGEGAS VALVE
END SWITCH
TV T Z
L1(HOT)
L2(NEUTRAL)
CIRCULATORON BOILER
(IF ATTACHED)
L1
C2
L2
TACOZONE
CONTROL
HONEYWELL L8124E OR EQUAL
120 VACINPUT
C1
LOW VOLTAGEGAS VALVE
END SWITCH
B1 B2
Aquastat Wiring
TV T Z
L1(HOT)
CIRCULATORON BOILER
(IF ATTACHED)
B2C2
B1
C1
TACOZONE
CONTROL
HONEYWELL L8124G & L OR EQUAL120 VACINPUT
ZR
END SWITCH
L1
L2(NEUTRAL)
L2
ZC
LINEVOLTAGE
OIL BURNERRELAY OR
GAS VALVE
L1 L2 T T
L1(HOT)
L2(NEUTRAL)
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
B2
C1
B1ZR
TACOZONE
CONTROL
HONEYWELL L8124M OR EQUAL
120 VACINPUT
C2
ZC
END SWITCH
L1 L2 T T
L1(HOT)
L2(NEUTRAL)
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
C1 B2B1
TACOZONE
CONTROL
HONEYWELL L8148A OR EQUAL
120 VACINPUT
C2
END SWITCH
3
86
87
Aquastat Wiring
TV W T
L1(HOT)
L2(NEUTRAL)
CIRCULATORON BOILER
(IF ATTACHED)
L1
C2
L2
TACOZONE
CONTROL
HONEYWELL L8148E OR EQUAL
120 VACINPUT
C1
LOW VOLTAGEGAS VALVE
END SWITCH
B1 B2
Z
TV W T
L1(HOT)
L2(NEUTRAL)
CIRCULATORON BOILER
(IF ATTACHED)
L1
C2
L2
TACOZONE
CONTROL
HONEYWELL L8148J OR EQUAL
120 VACINPUT
C1
LOW VOLTAGEGAS VALVE
END SWITCH
B1 B3
ZTP
B2
MILLI-VOLTAGE
GASVALVE
OR
L1 L2B2C2
B1
L1(HOT)
L2(NEUTRAL)
OIL BURNERAND
IGNITION
CIRCULATORON BOILER
(IF ATTACHED)
T T FF
TACOZONE
CONTROL
HONEYWELL L8182D OR EQUAL
120 VACINPUT
ZC
ZR
END SWITCH
C1
CAD CELL
Aquastat Wiring
L1 L2 T T
L1(HOT)
L2(NEUTRAL)
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
B2 C2 B1ZR
TACOSWITCHING
RELAY
HONEYWELL L8124A & C OR EQUAL
120 VACINPUT
C1 ZC
ZC ZR N H
T
THERMOSTAT(IF INDEPENDENT ZONE)
X XEND SWITCH
TV T Z
L1(HOT)
CIRCULATORON BOILER
(IF ATTACHED)
B2C2
B1
C1
HONEYWELL L8124G & L OR EQUAL
120 VACINPUT
ZR
L1
L2(NEUTRAL)
L2
ZC
LINEVOLTAGE
OIL BURNERRELAY OR
GAS VALVE
T THERMOSTAT(IF INDEPENDENT ZONE)
TACOSWITCHING
RELAY
ZC ZR N H
X XEND SWITCH
L1 L2 T T
L1(HOT)
L2(NEUTRAL)
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
B2 C2 B1ZR
HONEYWELL L8124M OR EQUAL
120 VACINPUT
C1 ZC
T
THERMOSTAT(IF INDEPENDENT ZONE)
TACOSWITCHING
RELAY
ZC ZR N H
X XEND SWITCH
88
89
Aquastat Wiring
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
C1
B2
B1
HONEYWELL L8148A OR EQUAL
C2
3
L1 L2 T T
L1(HOT)
L2(NEUTRAL)120 VAC
INPUT
T
THERMOSTAT(IF INDEPENDENT ZONE)
R
W
BB
RL6006LOWLIMIT
CONTROLERB2
TACOSWITCHING
RELAY
ZC ZR N H
X XEND SWITCH
L1 L2B2C2
B1
L1(HOT)
L2(NEUTRAL)
OIL BURNERAND
IGNITION
CIRCULATORON BOILER
(IF ATTACHED)
T T FF
HONEYWELL L8182D OR EQUAL
120 VACINPUT
ZC
ZR
C1
CAD CELLTTHERMOSTAT
(IF INDEPENDENTZONE)
TACOSWITCHING
RELAY
ZC ZR N H
X XEND SWITCH
Wiring for Boilers with Honeywell Aquastat Model L8124E or Equivalent
TV T Z
L1(HOT)
L2(NEUTRAL)
CIRCULATORON BOILER
(IF ATTACHED)
L1
C2
L2
120 VACINPUT
C1
B1 B2
TACO LTR0243T-1
YELREDWH YELGRN
HONEYWELLL8124E
G
FACTORY WIRING(unplug from B1 terminal)
MALECONNECTOR
FEMALECONNECTOR
NOTE: The green wire must be connected to a ground source electrically common to the boiler ground.
Wiring for Boilers with Honeywell Aquastat Model L8148E or Equivalent
TV W T
L1(HOT)
L2(NEUTRAL)
CIRCULATORON BOILER
(IF ATTACHED)
L1
C2
L2
120 VACINPUT
C1B1 B2
Z
TACO LTR0243T-1
YELREDWH YELGRN
G
FACTORY WIRING(unplug from B1 terminal)
MALECONNECTOR
HONEYWELLL8148E
FEMALECONNECTOR
NOTE: The green wire must be connected to a ground source electrically common to the boiler ground.
90
91
Aquastat Wiring to 24VAC Low Water Cutoff
TV W T
L1(HOT)
L2(NEUTRAL)
CIRCULATORON BOILER
(IF ATTACHED)
L1
C2
L2
120 VACINPUT
C1
LOW VOLTAGEGAS VALVE
B1 B2
HONEYWELLL8148E
TACO LNA024 or LTA024-2
N H COM NC NO
SPILLSWITCH
B
R
Z
G
TOTHERMOSTAT
Aquastat Wiring to 120VAC Low Water Cutoff
TV W T
L1(HOT)
L2(NEUTRAL)
CIRCULATORON BOILER
(IF ATTACHED)
L1
C2
L2
120 VACINPUT
C1
LOW VOLTAGEGAS VALVE
B1 B2
HONEYWELLL8148E
TACO LNA120 OR LTA120-2
N H COM NC NO
SPILLSWITCH
B
R
Z
G
TOTHERMOSTAT
Instruction SheetSR501-4 Switching Relay
92
AlternativeWiring
TACO SR501-4 REPLACEMNENT CROSS-REFERENCE
MANUFACTURER MODEL CONNECTIONS
Taco SR501-4 H N 3 4 NO 4 NC 5 6 NO 6 NC R/T W/T C
Argo AR821 1 2 3 4 5 6 T
AR822 L1 L2 3 4 NO 4 NC 5 6 NO 6 NC R/T G/T C
Colombus MR10 L1 L2 3 4 NO 4 NC 5 6 NO 6 NC R/T G/T C
Erie SR100 L1 N 3 4 NO 4 NC 5 6 NO 6 NC R/T G/T C
Honeywell RA89A 1 2 3 4 T T
RA832A 1 2 3 4 X X T T
R845A 1 2 3 4 5 6 T T
White-Rogers 889-189 1 2 3 4 T T
829-845 1 2 3 4 5 6 T T
Features:
External Indicator LightsUniversal ReplaceabilitySnap-in PC BoardSimplified WiringSealed RelaysFuse Protected Outputs100% Factory TestedContractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL ApprovedExtended 3 Year WarrantyMade in the USA
Operation:
Connect a thermostat to the “T T” terminalson the switching relay. When the thermo-stat calls for heat, the relay is energized andpower is given to the circulator.
Power Input:
Connect 120 volt ac power to terminals Nand H.
Jumper Placement:
The jumper is factory installed between terminals Hand 3 to switch power on terminals 4 n/o and 4 n/c.
External Diagnostics:
The External lights show full functionality of theswitching relay. The green light should always be on,indicating that power is connected. When the ther-mostat calls for heat, both the appropriate circulatorand red indicating light is energized.
The Taco Connection:Combine the reliability of the Taco Zone Valves,Priority Zoning Circulators, Thermostats, and the“00” family of circulators with the advanced featuresof the Taco Zone Controls to achieve total systemintegration. No matter the application, Taco now pro-vides the products to maximize system performancewhile simplifying both installation and service.
SR 501-4
N H 3 4 4 56 6N/O N/ON/C N/CCOM COM
120 VACINPUT
T T COM
R W 24VAC
TO: 120 VAC POWER CIRCULATOR
TO: ZC
THERMOSTAT
TO: ZR
ONE ZONESWITCHING RELAY
FUSE6 AMP
POWER
ZONE 1
LEDINDICATORS
FUSE6 AMP
ONE ZONESWITCHING RELAY
SR 501-4
FUSE6 AMP
POWER
ZONE 1
LEDINDICATORS
FUSE6 AMP
N H 3 4 4 56 6N/O N/ON/C N/CCOM COM
120 VACINPUT
T T COM
R W 24VAC
TO: 120 VAC POWERCIRCULATOR
JUMPERTO: TT ON BOILER
THERMOSTAT
Terminal Description:T & T Thermostat ConnectionCOM Common side of transformer, to power some
setback thermostatsN Neutral wire of power inputH Hot wire of power input3 Common terminal for 4 n/o and 4 n/c4 n/o Normally open terminal4 n/c Normally closed terminal6 n/c Normally closed terminal6 n/o Normally open terminal5 Common terminal for 6 n/o and 6 n/c
NOTE: When using Alternative Wiring diagram, the boiler operatingcontrol’s ZC terminal will see the load of the circulator(s). WARNING: When using Alternative Wiring diagram, wiring instruc-tions must be followed so power originates from the boiler aquastat.Failure to follow these wiring instructions may result in a secondarysource of power being connected to the boiler that may activate itunder certain circumstances, causing injury or death.
Specifications:PRODUCT NUMBER INPUT MAXIMUM TYPE 1 ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR501-4 1 120/60/1 VAC 12 amps 47/8" 65/8" 23/8"
All circulator relay connections, including ZC/ZR, are rated 1/3 hp (6 FLA, 36 LRA) at 120 VAC.The thermostat connection supplies a 24 VAC class 2 output.
WARNING: Wiring connections must be made in accordance with allapplicable electrical codes. Use copper wire only. 120 VAC wiring musthave a minimum temperature rating of 75°C. Failure to follow thisinstruction can result in personal injury or death and/or propertydamage. 12-18 gauge wire recommended for 120 VAC connections,14-22 gauge wire for thermostat connections, and 14-22 gauge wire for24 VAC source connections.
TypicalWiring
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any inter-ference received, including interference that may cause undesired operation.
Do it Once. Do it Right.®
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2010
TACO, Inc.
93
Instruction SheetSR501-HC-4 Switching Relay, High Current
Features:External Indicator LightsSimplified WiringSealed Relays100% Factory TestedContractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL ApprovedExtended 3 Year WarrantyMade in the USA
120 VAC Application:1 zone switching relay with boiler enable or2 zone without boiler enable.
240 VAC Application:1 zone switching relay when switching bothof the circulator hot leads (L1 & L2).
Operation:Connect a thermostat to the R & W1 and/or W2 terminals onthe switching relay. When the thermostat(s) call for heat, therelays are energized and power is given to the circulator(s).
Zone Control Power Input:Connect 120 volt AC power input to terminals N and H.Neutral wire to terminal N. Hot wire to terminal H.
External Diagnostics:The external lights show full functionality of the switchingrelay. The green light should always be on, indicating thatpower is connected. When either thermostat calls for heat,both the appropriate relay and red indicating light areenergized.
The Taco Connection:Combine the reliability of the Taco Zone Valves, PriorityZoning Circulators, Thermostats, and the “00” family of cir-culators with the advanced features of the Taco Zone Controlsto achieve total system integration. No matter the applica-tion, Taco now provides the products to maximize systemperformance while simplifying both installation and service.Terminal Description:R Hot side of transformer. Connect to R on thermostat.W1 Switched R signal from thermostat #1. Connect to W on thermostat.W2 Switched R signal from thermostat #2. Connect to W on thermostat.C Common side of transformer. Connect to COM
on thermostat (optional).N Neutral wire of power input.H Hot wire of power input.X1 Dry contacts for relay 1 (W1).X1 Dry contacts for relay 1 (W1).X2 Dry contacts for relay 2 (W2).X2 Dry contacts for relay 2 (W2).
AlternativeWiring
ONE ZONE HCSWITCHING RELAY
SR 501-HC-4
LEDINDICATORS
R W1
24 VAC THERMOSTAT
W2COM
24VAC
T T T
N H X1RELAY 2RELAY 1
120 VACINPUT
120 VACCIRCULATOR
X1X2 X2
N
ZR
ZC
HPOWER INPUT
(120 VAC)
POWER
RELAY 1
RELAY 2
ONE ZONE HCSWITCHING RELAY
SR 501-HC-4
LEDINDICATORS
R W1
24 VAC THERMOSTAT
W2COM
24VAC
T T T
N H X1RELAY 2RELAY 1
120 VACINPUT
POWERINPUT
(120 VAC)120 VAC
CIRCULATOR
X1X2 X2
N
H
BOILERCONTROL
POWER
RELAY 1
RELAY 2
NOTE: When using Alternative Wiring diagram, the boiler operatingcontrol’s ZC terminal will see the load of the circulator(s). WARNING: When using Alternative Wiring diagram, wiring instruc-tions must be followed so power originates from the boiler aquastat.Failure to follow these wiring instructions may result in a secondarysource of power being connected to the boiler that may activate itunder certain circumstances, causing injury or death.Specifications:
PRODUCT NUMBER INPUT TYPE 1 ENCLOSURENUMBER OF ZONES VOLTAGE WIDTH HEIGHT DEPTH
SR501-HC-4 1 or 2 120/60/1 VAC, 0.84 MA 47/8" 65/8" 23/8"
RELAY RATING: 1/3 HP (13.8 FLA, 82.8 LRA at 120 VAC) (6.9 FLA, 41.4 LRA at 240 VAC)The thermostat connection supplies a 24 VAC class 2 output.
WARNING: Wiring connections must be made in accordance with allapplicable electrical codes. Use copper wire only. Failure to follow thisinstruction can result in personal injury or death and/or propertydamage. 12-18 gauge wire recommended for 120/240 VAC connec-tions, 14-22 gauge wire for thermostat connections, and 14-22 gaugewire for 24 VAC source connections.
TypicalWiring
94
Do it Once. Do it Right.®
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2010
TACO, Inc.
SR501-HC-4 Switching Relay Instruction Sheet (page 2)
ONE ZONE HCSWITCHING RELAY
SR 501-HC-4
LEDINDICATORS
R W1
24 VAC THERMOSTAT
W2COM
24VAC
T T T
N H X1RELAY 2RELAY 1
120 VACINPUT
240 VACCIRCULATOR
X1X2 X2
N
H1
H2
ONE ZONE, NO BOILER ENABLE(CONTROL & CIRCULATOR SAME POWER SOURCE)
CONTROL POWERINPUT (120 VAC)
POWER
RELAY 1
RELAY 2
(240 VAC)
{{
ONE ZONE HCSWITCHING RELAY
SR 501-HC-4
LEDINDICATORS
R W1
24 VAC THERMOSTAT
W2COM
24VAC
T T T
N H X1RELAY 2RELAY 1
120 VACINPUT
240 VACCIRCULATOR
X1X2 X2
N
H1
H2
ONE ZONE, NO BOILER ENABLE(CONTROL & CIRCULATOR DIFFERENT POWER SOURCE)
H
POWER
RELAY 1
RELAY 2
CONTROL POWERINPUT (120 VAC)
(240 VAC)
{
{
ONE ZONE HCSWITCHING RELAY
SR 501-HC-4
LEDINDICATORS
R W1 W2COM
24VAC
T T T
N H X1RELAY 2RELAY 1
120 VACINPUT
CIRCULATOR #1(120 VAC)
X1X2 X2
N
TWO ZONE, NO BOILER ENABLE
H
CIRCULATOR #2(120 VAC)
THERMOSTAT #2(24 VAC)
THERMOSTAT #1(24 VAC)
POWERINPUT
(120 VAC)
POWER
RELAY 1
RELAY 2
95
Instruction SheetSR501-OR-4 Switching Relay with Outdoor Reset
ONE ZONE INSTALLATION W/O INDIRECT DHW
ONE ZONESWITCHING RELAY
WITH OUTDOOR RESET
SR 5
01O
R-4
LEDINDICATORS
POWER
TSTAT
DHWOVERRIDE
BOILERRELAY
N H
INPUT120 VAC
ZONE 1120 VAC
N H
6AMP
X RBOILER TSTAT
W C R WDHW
OUTDOORSENSOR
SUPPLYSENSOR
XDESIGN OUTDOOR
TEMPERATUREFOR 180°F SUPPLY
TEMPERATURE
OFF
-30
-20
0-10 10
20
40
30
ON
SW1
OFF
SYSTEMCIRCULATOR(OPTIONAL)
N
H
POWERINPUT
(120 VAC)
24 VACTHERMOSTAT
BOILERCONTROL
OUTDOORSENSOR
BOILERSUPPLYSENSOR
POT1
MULTI-ZONE INSTALLATION WITH ZONE CONTROL, WITH INDIRECT DHW
ONE ZONESWITCHING RELAY
WITH OUTDOOR RESET
SR 5
01O
R-4
LEDINDICATORS
POWER
TSTAT
DHWOVERRIDE
BOILERRELAY
N H
INPUT120 VAC
ZONE 1120 VAC
N H
6AMP
X RBOILER TSTAT
W C R WDHW
OUTDOORSENSOR
SUPPLYSENSOR
XDESIGN OUTDOOR
TEMPERATUREFOR 180°F SUPPLY
TEMPERATURE
OFF
-30
-20
0-10 10
20
40
30
ON
SW1
OFF
SYSTEMCIRCULATOR(OPTIONAL)
N
H
POWERINPUT
(120 VAC)
BOILERCONTROL
OUTDOORSENSOR
BOILERSUPPLYSENSOR
POT1
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
EXISTINGZONE VALVE CONTROL
POW
ER IN
24 V
AC
N/O COM N/C
PUMP ENDSWITCH
FUSE
5 A
MP
ZONE 3 PUMPEND SWITCH
THERMOSTATS(24VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
POWER
LEDINDICATORS
ZONE 1 ZONE 2 ZONE 3ISOLATEDX X R W R W R W
END SWITCH THERMOSTATS PRIORITY
24 VAC ZONE VALVES PRIORITY
X X
ZONE 3PRIORITY
OFF
ONC C C
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO 3 WIREZONE VALVE
123
JUMPER3 & 4
TACO 3 WIREZONE VALVE
123
DHWAQUASTATA
CONTROL STRATEGY:
Outdoor Reset:
In order to properly control a hot water heating system, the heat sup-plied to the building must equal the heat lost by the building.
• The heat supplied to a building is proportional to the temperature ofthe supply water and the surface area of the heating element. Asmall surface area such as baseboard radiators requires a higherwater temperature than a larger surface area such as radiant floors.
• The heat lost from a building is dependent on the outdoor tem-perature, as well as other factors. As the outdoor temperaturedrops, the building heat loss increases.
Reset Ratio:
Operation of a hot water heating system can generally be improved bymodulating the supply water temperature as the outdoor temperaturechanges. Using this approach, the heat lost from the building ismatched by the heat input to the building. The SR501-OR boiler resetcontrol utilizes a reset ratio to set the relationship between outdoortemperature and supply water temperature. The reset ratio determinesthe amount the supply water temperature is raised for every 1° drop inoutdoor air temperature, and it is determined from the starting pointand the system design conditions. In order for the control to automat-ically determine the reset ratio, outdoor design conditions must beestablished. This is usually the typical coldest outdoor temperatureor it can be set by using ASHARE standards for Design OutdoorTemperature for specific geographic locations.
APPLICATION:
The SR501-OR is a microprocessor-based control designed to regulatethe supply water temperature of a single boiler, based on the outdoortemperature. The SR501-OR is a boiler reset control and switching relayin one unit. The SR501-OR is ideal for retrofit application, but may alsobe used in new installations as well.
The SR501-OR includes functions such as automatic reset ratio calcu-lation, warm weather shut down (WWSD), minimum boiler temperaturesetting, and boiler differential setting. The control also has boiler sensorand outdoor sensor error checking.
40 30 20 100
-10
-20
-30
70-20
90
130
110
150
170
180
190
210
90 80 70 60 50 40 30 20 10 0 -10
OUTDOOR TEMPERATURE (°F)
BOILER SUPPLY TEMPERATURE vs. OUTDOOR TEMPERATURE (°F)FOR OUTDOOR DESIGN TEMPERATURES
BO
ILE
R S
UP
PLY
TE
MP
ER
ATU
RE
(°F)
96
SR501-OR-4 Switching Relay Instruction Sheet (page 2)Boiler Operation:
The supply water temperature from a boiler can be controlled bycycling the boiler on and off. Modulation of the boiler’s operatingtemperature in hot water heating systems not only provides morecomfort but also offers significant energy savings. The cooler theboiler runs, the more efficient it is due to less heat losses up the flueand reduced boiler jacket losses.
Differential:
An on / off boiler must be operated with a differential in order to pre-vent short cycling. When the supply water temperature drops belowthe bottom rail of the differential, the boiler is turned on. The boiler isthen kept on until the supply water temperature rises above the toprail of the differential. If the differential is too wide, there can be largesupply water temperature swings; however, if the differential is toonarrow, the boiler short cycles and operates inefficiently. This controlcan be set for two different boiler differentials, 10°F (6°C) or 20°F(12°C). This setting will help to achieve an appropriate balancebetween temperature swings and boiler efficiency.
Minimum Boiler Supply:
Most boilers require a minimum supply water temperature in order toprevent corrosion from flue gas condensation. The control shouldtherefore only modulate the boiler supply water temperature down tothe boiler manufacturer’s minimum recommended operating temper-ature. Some boilers are designed to condense and should be oper-ated at low water temperatures as much as possible for maximumefficiency.
Sup
ply
Wat
er T
em
per
atur
e
Time
Differential = 10°F (5°C)
165°F(74°C) Boiler off
Boi
ler o
n
155°F (68°C)
160°F (71°C)
Boiler off
Boi
ler o
n
Outdoor Air Temperature
50(10)
30(-1)
10(-12)
-10(-23)
70(21)
90(32)
WWSDTemperature
°F (°C)
Sup
ply
Wat
er T
empe
ratu
re
110 (43)
70 (21)
90 (32)
210 (99)
170 (77)
150 (65)
130 (54)
190 (88)
ResetRatio
BoilerMinimum
SEQUENCE OF OPERATION:
Powering Up the Control:
After the SR501-OR is powered up, the green power LED light will be on.
Heating Demand:
The SR501-OR receives a heating demand from thermostat or zonecontrol end switch closure on the R and W thermostat terminals. Thethermostat red LED light will also be turned on. The control can besetup for boiler temperature reset or ON – OFF boiler operation.
Reset Demand:
When the SR501-OR receives a heating demand the controls enablethe boiler based on the reset cure. The Boiler Relay red LED light willbe turned on when the boiler relay is energized.
DHW Demand:
When the SR501-OR receives a DHW demand the controls enablethe boiler and ignore the boiler reset curve. The DHW Override redLED light will also be turned on.
Warm Weather Shut Down (WWSD):
When the outdoor temperature rises above 70°F (21°C), the controlturns off the boiler. This function only applies for space heating andnot DHW operation.
Boiler Operation:
When the SR501-OR has a reset demand, the system supply watertemperature is controlled by turning the boiler on and off. The controlcalculates the target supply water temperature based on the outdoortemperature, and the settings that were entered. The boiler operatesaround a differential that is manually set by dip switch number 2. Thecontrol includes a minimum on and off time for the boiler, in order tominimize short cycling.
Maximum Boiler Supply:
The SR501-OR does not allow the boiler target temperature toexceed the boiler design temperature setting plus 10°F (6°C) up to amaximum of 225°F (107°C).
Minimum Boiler Supply:
The SR501-OR has a 140°F minimum boiler setting which is used inorder to prevent corrosion from flue gas condensation. During mildoutdoor conditions, the boiler cycles around the minimum boiler set-ting. This programmed function can be set to the OFF setting forcondensing and electric boilers.
INSTALLATION:
Step One:
Check the contents of this package. If any of the contents listed aremissing or damaged, please contact your sales representative forassistance.
The SR501-OR includes:
SR501-OR Boiler Reset Control and Switching Relay CombinationOne Outdoor SensorOne Strap on SensorInstruction Sheet
Replacement sensors are available from Taco, Inc.:
Strap on Sensor – 9300-2044RPOutdoor Sensor – 9300-2052RP
Note: Carefully read the details of the Sequence of Operation sectionin this brochure to ensure that you have chosen the proper control foryour application.
CAUTION: Improper installation and operation of this controlcould result in damage to the equipment and possibly evenpersonal injury. It is your responsibility to ensure that this con-trol is safely installed according to all applicable codes andstandards. This electronic control is not intended for use as aprimary limit control. Other controls that are intended and cer-tified as safety limits must be part of the control circuit.
97
SR501-OR-4 Switching Relay Instruction Sheet (page 3)
Step Two:
Installing the Control:
The enclosure is to be mounted flush onto a wall or any ridge surface.
• The mounting holes in the enclosure accept #6 screws. • Line voltage to enter from bottom of control and low voltage to
enter from top of control.
Installing the Outdoor Sensor:
Note: The temperature sensor (thermistor) is built into the enclosure.
• Use one round or pan head screw to attach the base of the sen-sor to the wall.
• The sensor is wall mounted and the wiring enters through thebottom of the enclosure. The hole for the cable entry must facedownward in order to prevent water from entering and filling theenclosure.
• The sensor should be mounted on a wall which best representsthe heat load on the building (i.e. a northern wall for most build-ings and a southern facing wall for buildings with large southfacing glass areas). The sensor should not be installed near heatsources such as ventilation or window openings.
• The sensor should be installed at an elevation above the groundthat will prevent accidental damage or tampering.
• Install the Outdoor Sensor and run the wiring back to the controlmounting location.
Installing the Boiler Sensor:
Note: This sensor is designed to mount on a pipe or in a temperatureimmersion well.
• The sensor can be strapped directly to the pipe using the cabletie provided. Insulation should be placed around the sensor toreduce the effect of air currents on the sensor measurement.
• The Boiler Sensor should be placed downstream of a pump orafter an elbow or similar fitting. This is especially important iflarge diameter pipes are used because the thermal stratificationwithin the pipe can result in erroneous sensor readings. Propersensor location requires that the fluid is thoroughly mixed withinthe pipe before it reaches the sensor.
Step Three:
Wiring to the Zone Control:
Line Voltage Connections –
Connect 120VAC incoming line voltage; Hot to the H terminal andNeutral to the N terminal.
Connect 120VAC circulator; HOT lead of circulator to Zone H ter-minal and Neutral lead of circulator to Zone N terminal.
Low Voltage Connections –
Connect thermostat or zone control end switch to the R and Wthermostat terminals.
Connect the DHW aquastat to the R and W DHW override terminals(optional).
Connect boiler’s T and T terminal to the X and X boiler end switchterminals.
Wiring the Sensors:
Do not apply power to these terminals as this will damage thecontrol.
Outdoor Sensor
Connect the two wires from the Outdoor Sensor to the OutdoorSensor terminals. The Outdoor Sensor measures the outdoor airtemperature.
Boiler Sensor
Connect the two wires from the Boiler Sensor to the SupplySensor terminals. The Boiler Sensor measures the supply watertemperature going from the boiler to the system.
SETTINGS:
Before adjusting the settings, read through the sequence of operationto ensure that you understand how the control operates. The follow-ing page describes how to program these settings into the controlonce it has been powered up.
Step Four:
Outdoor Design Temperature:
The Outdoor Design setting is the outdoor temperature used in the heatloss calculation. It is set to the typical coldest outdoor temperature.Using a small screwdriver adjust the rest ratio knob to appropriateOutdoor Design Temperature. When set to OFF, the boiler temperaturewill not be reset and boiler will fire to high limit when there is a call forheat.
Boiler Minimum Supply Temperature (Dip Switch #1):
Most boilers require a minimum operating temperature to preventcorrosion from flue gas condensation. The minimum boiler dip switchshould be set to ON (140°F) supply water temperature so boiler canoperate without causing the boiler flue gases to condense. Consultthe boiler manufacturer for recommended minimum boiler supplytemperatures. The dip switch can also be set to OFF (70°F) whencondensation is not a concern.
Differential (Dip Switch #2):
The differential adjustment sets how far the actual boiler supply watertemperature may deviate from the desired temperature before theboiler is turned on or off. This is a function of the water content of theboiler and the flow rate through the system pump relative to the heatoutput of the boiler. The differential can be set by dip switch #2, setto OFF for 10°F (6°C) or set to ON for 20°F (12°C).
Pump Operation (Dip Switch #3):
The pump operation is controlled by dip switch #3. When the dipswitch is set to ON, the pump output will energize when thermostator DHW calls for heat. When set to OFF, the pump will only come onwhen the thermostat calls for heat not the DHW.
Warm Weather Shut Down:
When the outdoor temperature rises above the 70°F (21°C), the con-trol turns off the boiler. This function only applies for space heatingand not DHW operation.
Do it Once. Do it Right.®
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2010
TACO, Inc.
98
SR501-OR-4 Switching Relay Instruction Sheet (page 4)
TROUBLESHOOTING:
Step Five:
As in any troubleshooting procedure, it is important to isolate a prob-lem as much as possible before proceeding. The blinking error LEDlight greatly simplifies troubleshooting of the SR501-OR. If you sus-pect a wiring fault, return to step three and carefully check all externalwiring and wiring connections.
Sensor Errors:
• If an outdoor sensor fault occurs, the SR501-OR will assume afixed outdoor temperature of 32°F (0°C) and will target theappropriate supply water temperature. The Boiler light will blinktwice every 5 seconds to indicate the outdoor sensor error.
• If a boiler sensor fault occurs, the SR501-OR turns the boiler offand the Boiler light will blink once every 5 seconds to indicatethe boiler supply sensor error.
Adjustment of Settings:
• If the outdoor temperature is cold and the rooms are cold,increase the Outdoor Design setting by 5°F (3°C) per day.
• If the boiler is cycling too often, increase the Differential setting.
Testing the Sensors:
A good quality test meter capable of measuring up to 5,000 kΩ(1 k = 1000 Ω) is required to measure the sensor resistance. In additionto this, the actual temperature must be measured with either a goodquality digital thermometer, or, if a thermometer is not available, a sec-ond sensor can be placed alongside the one to be tested and the read-ings compared. First measure the temperature using the thermometerand then measure the resistance of the sensor at the control. The wiresfrom the sensor must not be connected to the control while the test isperformed. Using the chart below, estimate the temperature measuredby the sensor. The sensor and thermometer readings should be close.If the test meter reads a very high resistance, there may be a brokenwire, a poor wiring connection or a defective sensor. If the resistance isvery low, the wiring may be shorted, there may be moisture in the sen-sor or the sensor may be defective. To test for a defective sensor, mea-sure the resistance directly at the sensor location.
Ω
ΩDo not apply voltage to a sensor at any timeas damage to the sensor may result.
Temperature Resistance Temperature Resistance Temperature Resistance Temperature Resistance
°F °C Ω °F °C Ω °F °C Ω °F °C Ω
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
-34
-29
-23
-18
-12
-7
-1
4
10
16
21
27
32
38
43
49
54
60
66
71
77
82
88
93
234,196
165,180
118,018
85,362
62,465
46,218
34,558
26,099
19,900
15,311
11,883
9,299
7,334
5,828
4,665
3,760
3,050
2,490
2,045
1,689
1,403
1,172
983
829
TECHNICAL DATA:
The installer must ensure that this control and its wiring are isolatedand/or shielded from strong sources of electromagnetic noise. Thisdevice complies with part 15 of the FCC Rules. Operation is subject to thefollowing two conditions: (1) This device may not cause harmful interfer-ence, and (2) this device must accept any interference received, includinginterference that may cause undesired operation.
SR501-OR Boiler Reset Control Relay:
Control: Microprocessor PI control. This is not asafety (limit) control.
Dimensions: 41⁄4" W x 51⁄4" H x 23⁄4" DApprovals: UL listed for US and Canada, Temperature
Indicating and Regulating Equipment.Power Supply: 120/60/1 VAC, 12 amps maximumRelays: Boiler Relay 1 amp @ 24 VAC
Circulator Relay 1⁄3 HP (6 FLA, 36 LRA
Sensors: NTC thermistor, 10 kΩ @ 77°F(25°C ±0.2°C) ß=3892
Outdoor Design Temp.: -30°F to 40°F (-35°C to 5°C) Boiler Minimum: 70°F or 140°F (21°C or 60°C) Differential: 10°F or 20°F (6°C or 12°C)WWSD: 70°F (21°C)
99
Instruction SheetSR502/503/504/506-4 Switching Relay
120 VAC INPUT
SIX ZONE SWITCHING RELAY
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1 ZONE 2
ZONE 3 ZONE 4 ZONE 5 ZONE 6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5
THERMOSTATS
SR 506-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
X X R W R W R W R W R W R WISOLATED
ENDSWITCH THERMOSTATS (24 VAC)
PRIORITY120 VACZR
H H N H N H N H N H N H N H N HZONE6
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
ZONE 5
ZONE 6
LEDINDICATORS
ZONE 6PRIORITY
OFF
ON
PRIORITY
TO: "TT" ON BOILER
JUMPER
24 VAC
COM
120 VAC INPUT
SIX ZONE SWITCHING RELAY
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1 ZONE 2
ZONE 3 ZONE 4 ZONE 5 ZONE 6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5
THERMOSTATS
SR 506-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
X X R W R W R W R W R W R WISOLATED
ENDSWITCH THERMOSTATS (24 VAC)
PRIORITY120 VACZR
H H N H N H N H N H N H N H N HZONE6
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
ZONE 5
ZONE 6
LEDINDICATORS
ZONE 6PRIORITY
OFF
ON
PRIORITY
TO: "ZC"ON BOILER
TO: "ZR"ON BOILER
24 VAC
COM
Operation: When any thermostat calls for heat, the appropriate circu-lator is energized and the isolated end switch (X and X) will start theboiler.Priority Operation: When zone 6 is switched to the priority settingand is actuated, all other zones will stop operation until zone 6 is sat-isfied. When zone 6 is not switched to priority, all zones will operateindependently.Priority Protection Operation: When the priority switch is set to ON,and if the priority zone calls continuously for more than one hour,power is returned to all the other zones, allowing each zone to functionindependently. Once the priority zone is satisfied, the control’s auto-reset is activated and the priority zone is again allowed to have priorityfor up to one hour starting from when it calls next.Jumper Placement: The jumper should be placed between terminalsZC and ZR. Connect the isolated end switch to the aquastat control onthe boiler.
Power Input: Connect 120 volt ac power input to terminals N and H.Neutral wire to terminal N. Hot wire to terminal H.
Operation: When any thermostat calls for heat, the boiler is given asignal to start. The appropriate circulator is energized only when theboiler temperature is above the set low limit.Priority Operation: When zone 6 is switched to the priority settingand is actuated, all other zones will stop operation until zone 6 is sat-isfied. When zone 6 is not switched to priority, all zones will operateindependently.Priority Protection Operation: When the priority switch is set to ON,and if the priority zone calls continuously for more than one hour,power is returned to all the other zones, allowing each zone to functionindependently. Once the priority zone is satisfied, the control’s auto-reset is activated and the priority zone is again allowed to have priorityfor up to one hour starting from when it calls next.Jumper Placement: REMOVE the jumper between terminals ZC andZR. Connect terminal ZC to ZC on the aquastat control. Connect ter-minal ZR to ZR on the aquastat control. Confirm polarity is consistentbetween boiler aquastat and switching relay.Power Input: Connect 120 volt ac power input to terminals N and H.Neutral wire to terminal N. Hot wire to terminal H.
The Taco Connection:Combine the reliability of the Taco Zone Valves, Priority ZoningCirculators, Thermostats, and the “00” family of circulators with theadvanced features of the Taco Zone Controls to achieve total systemintegration. No matter the application, Taco now provides the productsto maximize system performance while simplifying both installationand service.External Diagnostics:Externally visible lights show full functionality of the switching relay.The green light should always be on, indicating that power is connected.When the thermostat calls for heat, both the appropriate circulator andred indicating light is energized.
Cold Start BoilerApplication
Tankless Coil BoilerApplication(Alternative Wiring)
Features:External Indicator LightsSwitchable PriorityPriority ProtectionSimplified WiringSealed RelaysFuse Protected OutputsCompact Design100% Factory TestedIsolated End Switch
Contractor Friendly PC Board Layout
Universal Thermostat Compatibility
UL Approved24 volt Power Input or Output
TerminalExtended 3 Year WarrantyMade in the USA
WARNING: When using Alternative Wiring diagram, wiring instructions must be followed so power originates from the boiler aquastat. Failureto follow these wiring instructions may result in a secondary source of power being connected to the boiler that may activate it under certaincircumstances, causing injury or death.
Specifications:PRODUCT NUMBER INPUT MAXIMUM TYPE 1 ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR506-4 6 with Priority 120/60/1 VAC 20 amps 121/4" 8" 3"
All circulator relay connections, including ZC/ZR, are rated 1/3 hp (6 FLA, 36 LRA) at 120 VAC.End switch connections are rated 24 VAC, 1 amp.All thermostat connections supply a 24 VAC class 2 output.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This devicemay not cause harmful interference, and (2) this device must accept any interference received, including interferencethat may cause undesired operation.
WARNING: Wiring connections must be made in accordance with allapplicable electrical codes. Use copper wire only. 120 VAC wiring must havea minimum temperature rating of 75°C. Failure to follow this instructioncan result in personal injury or death and/or property damage. 12-18 gaugewire recommended for 120 VAC connections, 14-22 gauge wire for thermo-stat connections, and 14-22 gauge wire for 24 VAC source connections.
Do it Once. Do it Right.®
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2010
TACO, Inc.
100
Instruction SheetSR501-EXP-4 Switching Relay
POWER
ZONE 1
LEDINDICATORS
FUSE6 AMP
FUSE6 AMP
SR 501-EXP-4
POWERCONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORYPORT
120 VACINPUT
CIRCULATOR
HN/O N H120 VAC
CIRCULATORPRIMARYOUTPUT
N/CINPUT
120 VAC
PRIMARYCIRCULATOR(OPTIONAL)
TO: "TT" on Boiler Aquastat
THERMOSTAT
ENDSWITCH
RESETOVERRIDETHERMOSTATEXPANSION
X WRX 1A 2CB
TO: DHW Aquastat if PC700 Boiler Reset is installed. (See Page 2.)
T
24 VOLTS AC ONLY
C
SINGLE ZONEEXPANDABLE SWITCHING RELAY
Operation: When the thermostat calls for heat, the circulating pumpis energized and the isolated end switch (X and X) will start the boiler.Priority Operation: When the priority dip switch is set to ON and thezone is actuated, all other connected zoning panels will stop operationuntil the zone is satisfied. When the priority dip switch is set to OFFand the zone is actuated, all other connected zoning panels will oper-ate independently.Mode Operation: When the mode dip switch is set to NORMAL, the endswitch relay will be energized if any zone is in operation. When the modedip switch is set to RESET, the end switch relay will only be energizedthrough the operation of a plug-in reset control or closure of Priority Input.Primary Pump Operation: When the dip switch is set to OFF, the pri-mary circulating pump output will not energize when zone calls forheat. When the dip switch is set to ON, the primary circulating pumpoutput will energize when zone calls for heat.Post Purge Operation: When the dip switch is set to ON, the circula-tion pump output will stay energized for 2 minutes after its thermostator aquastat is satisfied, but not operate the boiler.Priority Protection Operation: When the dip switch is set to ON andthe zone (priority) on master zone panel calls for heat continuously formore than one hour, then power is returned to the space heating zonesallowing all the zones to function independently. Once the zone (pri-ority) on master zone panel is satisfied, the control’s auto-reset is acti-vated and the zone is again allowed to have priority for up to one hour. Pump Exercise Operation: When the dip switch is set to ON, the solidstate timer cycles all the circulating pumps that are attached to theExpandable Switching Relay at the selected time interval. The timeinterval can be set for the pumps to run for either 30 seconds every 2weeks or for 4 minutes every 24 hours.End Switch: The switch closes when the thermostat calls for heat andthe mode switch is set to NORMAL. The end switch also closes whenthe mode switch is set to RESET and a PC Series boiler reset power con-trol is calling for heat.Expansion Connections: Set the expansion switch to MASTER on theswitching relay that has the designated priority zone or is utilizing thePC Series plug-in option. Set all other daisy chained controls to SLAVE.Using thermostat wire (18-22 gauge) connect between terminals A, B,C on the master control to the corresponding A, B, C on the SLAVEcontrol(s). Controls may be daisy chained up to 20 zoning panels usingany combination of -EXP controls (120 zones if all are 6 zone panels).Thermostat Input (24 vac):
R Hot side of transformer. Connect to R on thermostat.W Switched R signal from thermostat. Connect to W on thermostat.C Common side of transformer. Connect to COM on
thermostat (optional).120 VAC Connections (N is Neutral, H is Hot):
Power Input Connect 120 Volt AC power.Primary Primary Pump (optional)N/O Zone Circulator ZoneN/C Zone Normally closed terminal for the Circulator Zone.
Will deactivate on a thermostat call.N Connect to pump neutral leads.
External Diagnostics: Externally visible lights show full functionality of theswitching relay. The green light should always be on, indicating that power isconnected. When the thermostat calls for heat, both the appropriate circulatorand red indicating light are energized.
WARNING: Wiring connections must be made in accordance with all applicable electrical codes. Use copper wire only. 120 VAC wiring must havea minimum temperature rating of 75°C. Failure to follow this instruction can result in personal injury or death and/or property damage. 12-18 gaugewire recommended for 120 VAC connections, 14-22 gauge wire for thermostat connections, and 14-22 gauge wire for 24 VAC source connections.
Wiring Diagram:
Features:Front External Indicator LightsIdeal for RetrofittingPrimary Circulator OutputSimplified WiringAdd-On Power ControlsSealed RelaysCompact DesignFuse Protected100% Factory TestedIsolated End SwitchUL Approved
Expandable to 20 Zoning Panels(120 zones if all are 6 zonepanels)
Contractor Friendly PC Board Layout
Universal ThermostatCompatibility
24 volt Power Input or OutputTerminal
Extended 3 Year WarrantyMade in the USA
SW1
SLAVEZONE PRIORITY ON
RESETPRIMARY PUMP FUNCTION ON
POST PURGE ONPRIORITY PROTECTION ON
PUMP EXERCISE ON30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFFOFF4 MIN/24 HOUR
Dip Switch Settings:
Specifications:PRODUCT NUMBER INPUT MAXIMUM TYPE 1 ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR501-EXP-4 1 120/60/1 VAC 12 amps 47/8" 65/8" 23/8"
All circulator relay connections, including ZC/ZR, are rated 1/3 hp (6 FLA, 36 LRA) at 120 VAC.The end switch connection is rated 24 VAC, 1 amp.The thermostat connection supplies a 24 VAC class 2 output.
This device complies with part 15 of the FCC Rules. Operation is subject to the fol-lowing two conditions: (1) This device may not cause harmful interference, and (2)this device must accept any interference received, including interference that maycause undesired operation.
For more wiring diagrams, visit www.taco-hvac.com.
Do it Once. Do it Right.®
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2010
TACO, Inc.
101
Instruction SheetSR503-EXP, SR504-EXP & SR506-EXP Switching Relay
Do it Once. Do it Right.®
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2010
TACO, Inc.
120 VAC INPUT
TO: "TT" ON BOILER
PRIMARY CIRCULATOR(OPTIONAL)
TO: "TT" ON BOILER WITH DHW "TT" INPUT
SIX ZONEEXPANDABLE SWITCHING RELAY
POWERCONTROLS
120 VAC CIRCULATORSZC
INPUT120 VAC
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5
THERMOSTATS
SR 506-EXP-4
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
FUSE6 AMP
NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY N/CPRIMARY
120 VACZR
H H N H N H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE6 ZONE6
PRIORITY
ACCESSORYPORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
ZONE 5
ZONE 6
LEDINDICATORS
Operation: When any thermostat calls for heat, the appropriate circu-lating pump is energized and the isolated end switch (X and X) willstart the boiler.
Priority Operation: When the priority dip switch is set to ON and thepriority zone is actuated, all other zones will stop operation until pri-ority zone is satisfied. When not switched to priority, all zones willoperate independently.
Mode Operation: When the dip switch is set to NORMAL, the end switchrelay will be energized if any zone is in operation. When the switch is setto RESET, the end switch relay will only be energized if the priority zoneis in operation, or through the operation of a plug-in reset control.
Primary Pump Operation: When the dip switch is set to OFF, the pri-mary circulating pump output will energize when any zone calls for heat,except the priority zone. When the dip switch is set to ON, the prima-ry circulating pump output will energize when any zone calls for heat.
Post Purge Operation: When the dip switch is set to ON, the priorityzone output will stay energized for 2 minutes after its thermostat oraquastat is satisfied, but not operate the boiler.
Priority Protection Operation: When the dip switch is set to ON, andif the priority zone calls continuously for more than one hour, power isreturned to all the other zones, allowing each zone to function inde-pendently. Once the priority zone is satisfied, the control's auto-reset isactivated and the priority zone is again allowed to have priority for upto one hour starting from when it calls next.
Pump Exercise Operation: When the dip switch is set to ON, the solidstate timer cycles all the circulating pumps that are attached to theExpandable Switching Relay at the selected time interval. The timeinterval can be set for the pumps to run for either 30 seconds every 2weeks or for 4 minutes every 24 hours.
Low Limit (ZC) Operation: When the dip switch is set to ON and theboiler drops below the set low limit (terminal ZC connected to boiler), all zone circulating pumps will stop. When the boiler rises above the setlow limit, the zone circulating pumps are allowed to operate.
End Switches (Dry Contacts): The main end switch closes when anyzone thermostat calls for heat and the mode switch is set to NORMAL.The main end switch also closes when the mode switch is set to RESETand a PC Series boiler reset power control is calling for heat. The priori-ty end switch closes only when the priority zone thermostat or aquastatis calling for heat.
Expansion Connections: Set the expansion switch to MASTER on theswitching relay that has the designated priority zone or is utilizing thePC Series plug-in option. Set all other daisy chained controls to SLAVE.Using thermostat wire (18-22 gauge) connect between terminals A, B, Con the master control to the corresponding A, B, C on the SLAVE con-trol(s). Controls may be daisy chained up to 20 zoning panels using anycombination of -EXP controls (120 zones if all are 6 zone panels).
Thermostat Input (24 vac):
R Hot side of transformer. Connect to R on thermostat.W Switched R signal from thermostat. Connect to W on thermostat.C Common side of transformer. Connect to COM on
thermostat (optional).NET Network terminals 1 & 2 are tied together for wiring conveniencewhen using communicating style thermostats (optional).
120 VAC Connections (N is Neutral, H is Hot):
Power Input Connect 120 Volt AC powerPrimary Primary Pump (optional)Zone 1-5 Circulator ZonesPriority Zone 6 Priority Zone (if enabled) or Zone 6N/C Zone 6 Normally closed terminals for the Priority Zone.
WIll deactivate on a Priority Zone call.
Cold Start Boiler Application
Specifications:PRODUCT NUMBER INPUT MAXIMUM TYPE 1 ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR506-EXP-4 6 with Priority 120/60/1 VAC 20 amps 121/4" 8" 3"
All circulator relay connections, including ZC/ZR, are rated 1/3 hp (6 FLA, 36 LRA) at 120 VAC.End switch connections are rated 24 VAC, 1 amp.All thermostat connections supply a 24 VAC class 2 output.
For more wiring diagrams, visit www.taco-hvac.com.
WARNING: Wiring connections must be made in accordance with allapplicable electrical codes. Use copper wire only. 120 VAC wiring must havea minimum temperature rating of 75°C. Failure to follow this instructioncan result in personal injury or death and/or property damage. 12-18 gaugewire recommended for 120 VAC connections, 14-22 gauge wire for thermo-stat connections, and 14-22 gauge wire for 24 VAC source connections.
SLAVEZONE PRIORITY ON
RESETPRIMARY PUMP FUNCTION ON
POST PURGE ONPRIORITY PROTECTION ON
PUMP EXERCISE ON30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFFOFF4 MIN/24 HOUR
LOW LIMIT (ZC) ON OFF
Dip Switch Settings:
External Diagnostics: Externally visible lights show full functionalityof the switching relay. The green light should always be on, indicatingthat power is connected. When the thermostat calls for heat, both theappropriate circulator and red indicating light are energized.
Features:Front External Indicator LightsIdeal for RetrofittingPrimary Circulator OutputSimplified WiringPlug-In Power ControlsSealed RelaysCompact DesignFuse Protected100% Factory TestedTwo Isolated End Switches
Expandable to 20 Zoning Panels (120zones if all are 6 zone panels)
Contractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL Approved24 volt Power Input or Output
TerminalExtended 3 Year WarrantyMade in the USA
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this devicemust accept any interference received, including interference that may cause undesired operation.
102
Instruction SheetZVC403/404/405/406-4 Zone Valve Control
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
ZVC 406 – 4
SIX ZONEZONE VALVE CONTROL
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
POW
ER IN
24 V
AC
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TOCIRCULATOR
DRYCONTACTS
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
THERMOSTATS (24VAC)
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
TO: BOILERAQUASTAT RELAY
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6ISOLATEDX X
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES PRIORITY
T
T
X X
ZONE 6PRIORITY
OFF
ON
NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
FUSE5 AMP
R W
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
See NOTE 1
R W R W R WC C CR W CC
FUSE5 AMP
R W C
NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.
Powered from Transformer A Powered from Transformer B
A
B
Powered from Transformer A Powered from Transformer B
Operation/External Diagnostics: When any thermostat calls forheat, the appropriate zone valve is energized and the yellow lightgoes on. When the zone valve is fully open, the red light goes onand energizes the end switch relay. The green light should alwaysbe on, indicating that power is connected.Priority Operation: When zone 6 is switched to the priority settingand is actuated, all other zones will stop operation until zone 6 is sat-isfied. When zone 6 is not switched to priority, all zones will operateindependently. Note: When a circulator is used on the priority zoneinstead of a zone valve, jumper 3 and 4 of the priority zone.Priority Protection Operation: When the priority zone calls con-tinuously for more than one hour, power is returned to all theother zones, allowing each zone to function independently. Oncethe priority zone is satisfied, the control's auto-reset is activatedand the priority zone is again allowed to have priority for up to onehour starting from when it calls next.The Taco Connection: Combine the reliability of the Taco ZoneValves, Priority Zoning Circulators, Thermostats, and the “00” family
of circulators with the advanced features of the Taco Zone Controls toachieve total system integration. No matter the application, Taco nowprovides the products to maximize system performance while simpli-fying both installation and service.Features: External Indicator Lights
Switchable PriorityPriority ProtectionSimplified WiringWorks with 2, 3, or 4-Wire Zone ValvesCompact DesignFuse Protected100% Factory TestedIsolated End SwitchExtra Set of Dry ContactsContractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL ApprovedSturdy Screw ConnectionsExtended 3 Year WarrantyMade in the USA
Wiring Diagram
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
X X
DHWPUMP
SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.SECONDARY PUMP COMES ON WHEN ANY ZONE CALLS EXCEPT PRIORITY ZONE.
SYSTEMPUMP SECONDARY
PUMP
120VAC
HOT
NEUTRAL
Optional Systemand/or DHW and/orSecondary Circulators
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference thatmay cause undesired operation.
WARNING: Wiring connections must be made in accordance with allapplicable electrical codes. Use copper wire only. 120 VAC wiring must havea minimum temperature rating of 75°C. Failure to follow this instructioncan result in personal injury or death and/or property damage. 12-18 gaugewire recommended for 120 VAC connections, 14-22 gauge wire for thermo-stat connections, and 14-22 gauge wire for 24 VAC source connections.
Specifications:PRODUCT NUMBER INPUT MAX 24 VAC TYPE 1 ENCLOSURENUMBER OF ZONES VOLTAGE OUTPUT @ 25°C WIDTH HEIGHT DEPTHZVC406-4 6 with Priority 120/60/1 VAC, 3A 24 VA per Zone 121⁄4" 8" 3"
40 VA per Transformer
The pump end switches are rated 1⁄6 hp, 5 amps at 120 VAC. The main and priority end switch connectionsare rated 24 VAC, 1 amp. All thermostat and zone valve connections supply a 24 VAC class 2 output.
Do it Once. Do it Right.®
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2010
TACO, Inc.
103
Instruction SheetZVC404-EXP & ZVC406-EXP Zone Valve Control
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
JUMPER3 & 4
SEE NOTE
ZVC 406-EXP-4SIX ZONE EXPANDABLEZONE VALVE CONTROL
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
POW
ER IN
24 V
AC
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER 120 VAC
INPUT
WHITE
BLACK
TOCIRCULATOR
DRYCONTACTS
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
SLAVEPRIORITY ON
RESETPOST PURGE ON
PRIORITY PROTECTION ONPUMP EXERCISE ON
30 SEC/2 WK
MASTEROFFNORMALOFFOFFOFF4 MIN/24 HOUR
NOTE: When a circulator is usedon the priority zone instead of azone valve, jumper 3 and 4 ofthe priority zone.
INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT
T STAT 1 VALVE 1
T STAT 2 VALVE 2
T STAT 3 VALVE 3
T STAT 4 VALVE 4
VALVE 5
T STAT 6 VALVE 6
POWER
LEDINDICATORS
T STAT 5
TO: "TT" ON BOILER
TO: "TT" ON BOILER WITH DHW "TT" INPUT
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6 NETEXPANSIONMAIN PRIORITY
X X X X A B C R W C R W C R W C R W C R W C R W C 1 2
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES PRIORITY
X X
POWERCONTROLS
ACCESSORYPORT
FUSE5 AMP
FUSE5 AMP
THERMOSTATS (24 VAC)
Powered from Transformer A Powered from Transformer B
A
B
Powered from Transformer A Powered from Transformer B
Operation/External Diagnostics: When any thermostat calls for heat,the appropriate zone valve is energized and the yellow light goes on.When the zone valve is fully open, the red light goes on and energizesthe end switch relay. The green light should always be on, indicatingthat power is connected.Priority Operation: When the priority dip switch is set to ON and thepriority zone is actuated, all other zones will stop operation until pri-ority zone is satisfied. When not switched to priority, all zones willoperate independently.Mode Operation: When the dip switch is set to NORMAL, the endswitch relay will be energized if any zone is in operation. When the switchis set to RESET, the end switch relay will only be energized if the priorityzone is in operation, or through the operation of a plug-in reset control.Post Purge Operation: When the dip switch is set to ON, the priori-ty zone output will stay energized for 2 minutes after its thermostat oraquastat is satisfied, but not operate the boiler.Priority Protection Operation: When the dip switch is set to ON, andif the priority zone calls continuously for more than one hour, poweris returned to all the other zones, allowing each zone to function inde-pendently. Once the priority zone is satisfied, the control's auto-reset isactivated and the priority zone is again allowed to have priority for upto one hour starting from when it calls next. Pump Exercise Operation: When the dip switch is set to ON, the solidstate timer cycles all the zone valves and circulating pumps that areattached to the Expandable Zone Valve Control at the selected timeinterval. The time interval can be set for the valves and pumps to runfor either 30 seconds every 2 weeks or for 4 minutes every 24 hours.End Switches (Dry Contacts): The main end switch closes when anyzone thermostat calls for heat and the mode switch is set to NORMAL.The main end switch also closes when the mode switch is set to RESETand a PC Series boiler reset power control is calling for heat. The priority
end switch closes only when the priority zone thermostat or aquastat iscalling for heat.Expansion Connections: Set the expansion switch to MASTER on theswitching relay that has the designated priority zone or is utilizing thePC Series plug-in option. Set all other daisy chained controls to SLAVE.Using thermostat wire (18-22 gauge) connect between terminals A, B,C on the master control to the corresponding A, B, C on the SLAVE con-trol(s). Controls may be daisy chained up to 20 zoning panels using anycombination of -EXP controls (120 zones if all are 6 zone panels).Thermostat Input (24 vac):
R Hot side of transformer. Connect to R on thermostat.W Switched R signal from thermostat. Connect to W on
thermostat.C Common side of transformer. Connect to COM on
thermostat (optional).NET Network terminals 1 & 2 are tied together for wiring convenience
when using communicating style thermostats (optional).Power Input (120 vac):Connect neutral (white) leads on transformers to 120 volts acneutral power supply.Connect hot (black) leads on transformers to 120 volts achot power supply.Pump End Switch (Dry Contacts):Connect hot power supply to the right side of the pump end switchterminal on board.Connect hot input lead of the circulator to the left side of the pumpend switch terminal on board.Zone 6 Pump End Switches (Dry Contacts): See Diagram.
N/O Normally open terminal of the priority zone relay.COM Common terminal of the priority zone relay.N/C Normally closed terminal of the priority zone relay.
End Switch Pump Neutral Connections:Connect neutral power supply directly to neutral lead on circulator(s).
WARNING: Wiring connections must be made in accordance with allapplicable electrical codes. Use copper wire only. 120 VAC wiring must havea minimum temperature rating of 75°C. Failure to follow this instructioncan result in personal injury or death and/or property damage. 12-18 gaugewire recommended for 120 VAC connections, 14-22 gauge wire for thermo-stat connections, and 14-22 gauge wire for 24 VAC source connections.
Wiring Diagram
N/O COM N/C
PUMP ENDSWITCH
ZONE 6 PUMPEND SWITCH
X X
DHWPUMP
SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.SECONDARY PUMP COMES ON WHEN ANY ZONE CALLS EXCEPT PRIORITY ZONE.
SYSTEMPUMP SECONDARY
PUMP
120VAC
HOT
NEUTRAL
Optional Systemand/or DHW and/orSecondary Circulators
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference thatmay cause undesired operation.
Specifications:PRODUCT NUMBER INPUT MAX 24 VAC TYPE 1 ENCLOSURENUMBER OF ZONES VOLTAGE OUTPUT @ 25°C WIDTH HEIGHT DEPTH
ZVC406-EXP-4 6 with Priority 120/60/1 VAC, 3A 24 VA per Zone 121⁄4" 8" 3"40 VA per Transformer
The pump end switches are rated 1⁄6 hp, 5 amps at 120 VAC. The main and priority end switch connectionsare rated 24 VAC, 1 amp. All thermostat and zone valve connections supply a 24 VAC class 2 output.
Do it Once. Do it Right.®
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2010
TACO, Inc.
104
Instruction SheetHydro Air Fan Controls
Operation HAFC101 and 201:The Hydro Air Fan Control is an interfacebetween the thermostat and air handler. Italso has an isolated end switch to start theboiler and/or pump. When the thermostatcalls for heat, the Fan Control energizes theend switch relay and allows the fan to operateat low speed when the water is above theoptional aquastat setting. When the thermo-stat calls for cooling, the Fan Control energizesthe condenser and operates on high speed.
Additional HAFC201 Operations:Selectable one, three or four minute delay onfan operation in heating mode. Selectablepump exercise activates circulator but doesnot enable boiler contacts. Two minutes every24 hours minimizes the chance of bacteriabuild-up in an open loop system. Thirty sec-onds every two weeks minimizes seasonalstart-up problems generally associated withharsh water conditions. Optional aquastat orthermostat can be connected to FreezeProtection TT terminals to reduce the chanceof pipes freezing by energizing the pump drycontacts (boiler contacts not activated.)
Switch Settings (HAFC201):1 1 minute on fan delay, in heating mode2 3 minute on fan delay, in heating mode
1&2 4 minute on fan delay, in heating mode3 Pump dry contact activated for 2 min-
utes every 24 hours (boiler contacts notactivated)
4 Pump dry contacts activated for 30 sec-onds every two weeks (boiler contacts not activated)
External Diagnostics:The external lights show full functionality ofthe Hydro Air Fan Control. The green lightshould always be on, indicating that power isconnected. Red lights indicate fan operationfor heating and cooling modes.
HAFC201-4HYDRO AIR FAN CONTRL
THERMOSTAT
POWER
HEAT CALL
LEDINDICATORS
THERMOSTAT
T
C R W Y GAQUASTATS
T T
HAFC201-4
COOL FAN
HEAT FAN
BOILERC
AIR HANDLERX X R Y GL GH
WATERCOIL
FREEZEPROT.
T T
X X
PUMP
1 MIN
FAN
DE
LAY
3 MIN
FAN
DE
LAY
2MIN
/24HR
or 30SE
C/2W
K
PU
MP
EX
ER
CIS
E
OFF O
N
To: OptionalAquastat onReturn Line ofHydro Coil
To: Optional Aquastator Thermostat to senselow ambienttemperature
Optional Power Wireto Thermostatthat Requires 24VAC
NO
TE: For 4 minute
ON
DELA
Y of Heating
Fan,sw
itch 1 and 3 M
IN O
ND
ELAY to O
N p
osition.
FANRELAY
LIN
E24
VA
C
OUTDOORCONDENSER
UNIT
JUMPER
CIRCULATOR
(or to “T T” onswitching relay)
Dry Contacts To:“T T” on Boileror SwitchingRelay
H
N
120 VACINPUT
M
HAFC101-4HYDRO AIR FAN CONTRL
THERMOSTAT
POWER
H2O COIL
LEDINDICATORS
C R W Y G
AQUASTATT T
HAFC101-4
HIGH FAN
LOW FAN
BOILERC
AIR HANDLERX X R Y GL GH
THERMOSTAT
TTo: Aquastaton Return Lineof Hydro Coil
Optional Power Wireto Thermostatthat Requires 24VAC
OUTDOORCONDENSER
UNIT
FANRELAY
LIN
E24
VA
C
LOW
HIG
H
M
Dry Contacts To:“T T” on Boileror SwitchingRelay
Terminal Description:Thermostat:C Optional: Common side of transformer W White - Heating signal
to power some styles of thermostats Y Yellow - Condenser signalR Red - Hot side of transformer used to G Green - Fan signal
switch all functionsWater Coil Aquastat:TT Connect to aquastat at air handler to control operation of the fan when
in the heating mode. Install a jumper if the aquastat is not usedFreeze Protection Aquastat:TT Connect to aquastat or thermostat to sense low ambient temperature.
Reduces the chance of pipes freezing by energizing the pump dry contacts.Pump Dry Contacts:XX May switch pump directly by bringing in external line voltage or connect
to “T T” on a switching relay.Boiler Dry Contacts:XX Connect to the boiler or “T T” terminals on a switching relay.Air Handler:C Common side of transformer to power the Fan ControlR Red - Hot side of transformer used to switch all functionsY Yellow - Condenser signal
One Speed Motor:Glow Connect the fan to the relay. Keep the jumper installed between Ghigh and Glow.
Two Speed Motor:Ghigh Remove jumper and connect Ghigh to the high speed fan relay and
connect Glow to the low speed fan relay.
Specifications: ** Model number changed from SR501-FPRODUCT NUMBER POWER INPUT MAXIMUM RELAY THERMOSTAT SINGLE PHASE MOTOR DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD TYPE CURRENT RATING (RELAY) WIDTH HEIGHT DEPTH
HAFC101-4** 1 Zone 24 VAC Input 5 amps DPDT .18 1/6 HP(5A) @120VAC 4 1/4" 5 1/4" 2 3/4"HAFC201-4•• 1 Zone 24 VAC Input 5 amps DPDT .18 1/6 HP(5A) @120VAC 4 1/4" 5 1/4" 2 3/4"The Hydro Air Fan Controls are relay type DPDT, have a thermostat current of .18 and a single phase motor rating per zone of 1/6 HP (5A) @ 120 VAC.
* Both HAFC101 and 201 capable of 1 and 2 speed applications
WARNING: Wiring connections must bemade in accordance with all applicable elec-trical codes. Use copper wire only. 120 VACwiring must have a minimum temperaturerating of 75°C. Failure to follow this instruc-tion can result in personal injury or deathand/or property damage. 12-18 gauge wirerecommended for 120 VAC connections,14-22 gauge wire for thermostat connec-tions, and 14-22 gauge wire for 24 VACsource connections.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any inter-ference received, including interference that may cause undesired operation.
Do it Once. Do it Right.®
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2010
TACO, Inc.
105
Standard Terms and Definitions
Switching Relay: Transformer and relay in one box, which allows a low voltage thermostat to control a line voltage load (circulator),with an isolated end switch that can energize the boiler.
Zone Valve Control: Transformer and relay in one box, which allows a low voltage thermostat to control a low voltage zone valve, withan isolated end switch that can energize the boiler and/or circulators.
Dry Contacts: Set of relay contacts that make and beak, where no voltage is present. Usually can switch 24 or 120 VAC.
Isolated End Set Switch: Set of dry contacts that make when a zone calls for heat. Usually connected to a boiler’s aquastat TT.
Mode Switch: Switch set to NORMAL – When any zone calls for heat, the end switch will make and fire the boiler.Switch set to RESET – When any zone calls for heat, a heat demand signal is given to external add-on reset control and it controlsboiler operation.Also when the priority zone calls for heat and is switched to priority, the end switch will override reset control andfire boiler to high limit.
TT: Where thermostat or aquastat connects on a heating control.
XX: Denotes Isolated End Switch.
Low Voltage: 24 VAC for most HVAC systems.
Line Voltage: Normally 120 VAC relative to ground.
H or L1: Hot side of line voltage.
N or L2: Neutral side of line voltage.
ZR: 120 VAC (Hot) signal from switching relay to boiler’s operating aquastat to fire the burner to high limit when any zone calls forheat. Also ideal for controlling primary circulator.
ZC: 120 VAC (Hot) signal from boiler’s operating aquastat to switching relay allowing circulator(s) to run when aquastat is above theset low limit.
Cold Start: A boiler that fires only when there is a call for heat.
Tankless Coil: A method of heating domestic water utilizing a heat exchanger inside a boiler.The boiler also maintains heat year roundto deliver hot water on demand.
DHW Heater: A method of heating domestic water utilizing a heat exchanger and storage tank.
Transformer: A component for increasing or reducing AC voltage. Rated in VA (volts x amps).
OHMS Law: Example: A 24 volt, 40 VA transformer can produce how much current?
Current = VA / Voltage 40 / 24 = 1.6 Amps
I = E/R where I = Current in AmpsR = E/I R = Resistance in OhmsE = I x R E = Volts
W = E x I W = Watts or VAI = W(VA)/E
RELAY CONTACTS:
N/C: Normally closed connection of a relay, when not energized.N/O: Normally open connection of a relay, when not energized.Com: The common terminal for normally open and normally closed.Pole: The number of independent circuits of a switch or relay.
Throw: The number of settings which a switch or relay can have.
DPDT = Double Pole Double Throw
N/O N/C N/C N/O3 4 4 6 6 5
COM COM
TACO
Zon
e Co
ntro
ls Cr
oss-
Refe
renc
e
106
TA
CO
AR
GO
ER
IEH
ON
EY
WE
LL
SW
ITC
HIN
G R
EL
AY
S
1 Z
one
Switc
hing
Rel
ay (
DPD
T)
1 Z
one
Switc
hing
Rel
ay1
Zon
e Sw
itchi
ng R
elay
with
Out
door
Res
et2
Zon
e Sw
itchi
ng R
elay
with
Pri
ority
3 Z
one
Switc
hing
Rel
ay w
ith P
rior
ity4
Zon
e Sw
itchi
ng R
elay
with
Pri
ority
6 Z
one
Switc
hing
Rel
ay w
ith P
rior
ity
SR
501
SR
501-
HC
SR
501-
OR
SR
502
SR
503
SR
504
SR
506
AR
822I
I
AR
-861
-2II
(3)
AR
-861
-3II
(3)
SR
100
SR
201
SR
301
SR
601
R60
1 (4
)
RA
89A
(2),
RA
845A
(1),
RA
832A
(1),
R88
45U
, R
A88
9A
EX
PAN
DA
BL
E S
WIT
CH
ING
RE
LA
YS
1 Z
one
Switc
hing
Rel
ay w
ith P
rior
ity3
Zon
e Sw
itchi
ng R
elay
with
Pri
ority
4 Z
one
Switc
hing
Rel
ay w
ith P
rior
ity6
Zon
e Sw
itchi
ng R
elay
with
Pri
ority
SR
501-
EX
PS
R50
3-E
XP
SR
504-
EX
PS
R50
6-E
XP
AR
M-3
P (5
,6)
AR
M-4
P (5
,6)
AR
M-6
P (5
,6)
AQ
2504
2B (9
)
ZO
NE
VA
LVE
CO
NT
RO
LS
3 Z
one
Valv
e C
ontr
ol w
ith P
rior
ity4
Zon
e Va
lve
Con
trol
with
Pri
ority
5 Z
one
Valv
e C
ontr
ol w
ith P
rior
ity6
Zon
e Va
lve
Con
trol
with
Pri
ority
ZV
C40
3 (7
)Z
VC
404
(7)
ZV
C40
5 (7
)Z
VC
406
(7)
AZ
-3A
Z-4
PA
Z-5
AZ
-6P
VL5
00 (
8)V
L500
(8)
EX
PAN
DA
BL
E Z
ON
E V
ALV
E C
ON
TR
OL
S
4 Z
one
Valv
e C
ontr
ol w
ith P
rior
ity6
Zon
e Va
lve
Con
trol
with
Pri
ority
ZV
C40
4-E
XP
ZV
C40
6-E
XP
AQ
2504
4B (9
)
107
TACO
Zon
e Co
ntro
ls Cr
oss-
Refe
renc
e (C
ontin
ued)
NO
TE
S:
1.D
oes
not
have
bot
h no
rmal
ly o
pen
and
norm
ally
clo
sed
cont
acts
.2.
Has
onl
y on
e se
t of
nor
mal
ly o
pen
cont
acts
(SP
ST).
3.D
oes
not
have
opt
iona
l pri
ority
.4.
Can
be
expa
nded
to
five
and
six
zone
s w
ith t
he a
dditi
on o
f EX
P10
rela
ys.
5.A
rgo
AR
M u
nits
are
exp
anda
ble
to 1
0 zo
nes
usin
g sp
ecia
l con
trol
s (A
RM
-1,A
RM
-4)
with
a p
hone
jack
.TA
CO
sw
itchi
ng r
elay
s ca
n be
exp
ande
d up
to
120
zone
s us
ing
any
com
bina
tion
of -
EXP
mod
els
with
no
spec
ial c
onne
ctio
ns.
6.In
clud
es o
nly
one
data
por
t fo
r ad
ding
dat
a po
rt m
odul
es.
7.A
ll TA
CO
zon
e va
lve
cont
rols
incl
ude
an e
xtra
set
of d
ry c
onta
cts
(N/O
,Com
mon
,N/C
).8.
VL5
00 is
onl
y 5
zone
s,4
norm
al a
nd 1
pri
ority
.9.
Use
with
Hon
eyw
ell A
Q10
00 t
herm
osta
ts.
TA
CO
AR
GO
ER
IEH
ON
EY
WE
LL
AD
D-O
N P
OW
ER
CO
NT
RO
LS
Boile
r R
eset
Con
trol
2-St
age
Boile
r R
eset
Con
trol
Vari
able
Spe
ed P
ump
Inje
ctio
n M
ixin
g C
ontr
ol
PC
700
PC
702
PC
705
DP
M-2
BB
1200
BB
3000
AQ
2511
0B
AQ
2540
0B
FAN
CO
NT
RO
LS
1 Z
one
Hyd
ro A
ir F
an C
ontr
ol (
1 or
2 S
peed
)1
Zon
e H
ydro
Air
Fan
Con
trol
with
Tim
e D
elay
s (1
or
2 Sp
eed)
HA
FC10
1H
AFC
201
AR
H-1
, AR
H-2
, AR
H-3
WA
300
CONTROLS MADE EASY.®
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2010
TACO, Inc.