the all new . . . taco zone controls wiring guides3.supplyhouse.com/product_files/taco -...
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
ZO
NE
1 ZO
NE
2 ZO
NE
3 ZO
NE
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 REM
OVE
JUM
PER
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
ZO
NE
1 ZO
NE
2 ZO
NE
3 ZO
NE
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
ZO
NE
1 ZO
NE
2 ZO
NE
3 ZO
NE
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 REM
OVE
JUM
PER
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
ZO
NE
1 ZO
NE
2 ZO
NE
3 ZO
NE
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
ZO
NE
1 ZO
NE
2 ZO
NE
3 ZO
NE
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
ZO
NE
1 ZO
NE
2 ZO
NE
3 ZO
NE
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
ZO
NE
1 ZO
NE
2PR
IORI
TY
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
ZO
NE
1 ZO
NE
2PR
IORI
TY
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