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1 of 12 © 2003 A 265 - 10/03
- Application BrochureBoiler Control 265
A 26510/03
Features of the Boiler Control 265Please refer to Essay E 005: Control Functions and Benefits for a detailed description of these features.
ApplicationThe tekmar Boiler Control 265 can control the supply water temperature on up to three modulating boilers based on outdoor temperature or setpoint requirements. The control can be set to control up to two modu-lating boilers based on outdoor temperature or domestic hot water requirements. The control has outputs for a primary pump, individual boiler pumps, and either a combustion air damper or an alarm.
115 V (ac)
24 V (ac)
CombustionAir Damper (C1)
Boiler Control 265Three Modulating Boiler & DHW / Setpoint
Menu Item
Boiler Demand
DHW / Setpoint Demand
WWSD
Modulation
Boiler Output (x10,000 BTU/hr)
External Input Signal
Offset / Priority Override
• Outdoor Reset• Characterized Heating Curve• Water Temperature Setback• Boost• Warm Weather Shut Down• Boiler Outdoor Reset• Soft Stop• Boiler Differential (Automatic)• Boiler Minimum Supply• Boiler Post Purge• PID Staging• Equal Run Time Rotation• Sequential Modulation
• Fixed Lead• Fixed Last• Fire Delay• Boiler Mass• DHW Boiler Reset Override• DHW Priority• DHW Priority Override• DHW Post Purge• DHW Mixing Purge• Setpoint Boiler Reset Override• Setpoint Priority• Modulating Output• Parallel Modulation
© 2003 A 265 - 10/03 2 of 12
Co
nce
pt
Dra
win
gT
his
is o
nly
a co
ncep
t dra
win
g, n
ot a
n en
gine
ered
dra
win
g. It
is n
ot in
tend
ed to
de
scrib
e a
com
plet
e sy
stem
, no
r an
y pa
rtic
ular
sys
tem
. It
is u
p to
the
sys
tem
de
sign
er t
o de
term
ine
the
nece
ssar
y co
mpo
nent
s fo
r an
d co
nfig
urat
ion
of t
he
part
icul
ar s
yste
m b
eing
des
igne
d, i
nclu
ding
add
ition
al e
quip
men
t, is
olat
ion
rela
ys (
for
load
s gr
eate
r th
an t
he c
ontr
ol’s
spe
cifie
d ou
tput
rat
ings
), a
nd a
ny
safe
ty d
evic
es w
hich
in th
e ju
dgem
ent o
f the
des
igne
r ar
e ap
prop
riate
, in
orde
r to
pro
perly
siz
e, c
onfig
ure
and
desi
gn t
hat
syst
em a
nd t
o en
sure
com
plia
nce
with
bui
ldin
g an
d sa
fety
cod
e re
quire
men
ts.
tekm
ar C
ontr
ol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontr
ol S
yste
ms,
Inc.
, U.S
.A.;
ww
w.t
ekm
arco
ntr
ols
.co
mH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad
, Ver
no
n, B
.C. C
anad
a, V
1B 3
K4;
(25
0) 5
45-7
749
Fax
(25
0) 5
45-0
650
- A
pp
licat
ion
Mec
han
ical
Sys
tem
Op
erat
ion
The
Boi
ler
Con
trol
265
pro
vide
s ou
tdoo
r re
set
to a
spa
ce h
eatin
g sy
stem
. Li
ne v
olta
ge is
use
d to
pro
vide
a p
erm
anen
t bo
iler
dem
and.
The
boi
lers
are
pip
ed in
prim
ary-
seco
ndar
y an
d th
e bo
iler
pum
ps a
re c
ontr
olle
d by
the
265
to a
llow
pos
t pu
rgin
g of
the
boile
rs a
fter
they
hav
e sh
ut o
ff. T
he c
ontr
ol h
as a
n al
arm
con
tact
whi
ch c
lose
s w
hen
ther
e is
an
erro
r m
es-
sage
. The
War
m W
eath
er S
hut D
own
feat
ure
prev
ents
the
boile
rs fr
om fi
ring
in th
e su
mm
er m
onth
s, e
nsur
ing
the
heat
ing
spac
e do
es n
ot o
verh
eat.
A1
= A
larm
P1
= B
oile
r P
ump
1P
2 =
Boi
ler
Pum
p 2
P3
= B
oile
r P
ump
3P
4 =
Sys
tem
Pum
pS
1 =
Boi
ler
Sup
ply
Sen
sor
071
S2
= B
oile
r R
etur
n S
enso
r 07
1S
3 =
Out
door
Sen
sor
070
A 2
65-1
10/0
3
Out
door
Sen
sor
(S3)
070
115
V (
ac)
24 V
(ac
)
Cla
ss II
Tran
sfor
mer
265
P3
P2
P1
Boi
ler
Ret
urn
Sen
sor
(S2)
071B
oile
r S
uppl
yS
enso
r (S
1) 0
71P
4
Ala
rm (
A1)
3 of 12 © 2003 A 265 - 10/03
Co
nce
pt
Dra
win
gT
his
is o
nly
a co
ncep
t dra
win
g, n
ot a
n en
gine
ered
dra
win
g. It
is n
ot in
tend
ed to
de
scrib
e a
com
plet
e sy
stem
, no
r an
y pa
rtic
ular
sys
tem
. It
is u
p to
the
sys
tem
de
sign
er t
o de
term
ine
the
nece
ssar
y co
mpo
nent
s fo
r an
d co
nfig
urat
ion
of t
he
part
icul
ar s
yste
m b
eing
des
igne
d, i
nclu
ding
add
ition
al e
quip
men
t, is
olat
ion
rela
ys (
for
load
s gr
eate
r th
an t
he c
ontr
ol’s
spe
cifie
d ou
tput
rat
ings
), a
nd a
ny
safe
ty d
evic
es w
hich
in th
e ju
dgem
ent o
f the
des
igne
r ar
e ap
prop
riate
, in
orde
r to
pro
perly
siz
e, c
onfig
ure
and
desi
gn t
hat
syst
em a
nd t
o en
sure
com
plia
nce
with
bui
ldin
g an
d sa
fety
cod
e re
quire
men
ts.
tekm
ar C
ontr
ol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontr
ol S
yste
ms,
Inc.
, U.S
.A.;
ww
w.t
ekm
arco
ntr
ols
.co
mH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad
, Ver
no
n, B
.C. C
anad
a, V
1B 3
K4;
(25
0) 5
45-7
749
Fax
(25
0) 5
45-0
650
- A
pp
licat
ion
Ele
ctri
cal
Ess
enti
al C
on
tro
l Set
tin
gs
Boi
l 3 ≠
OF
F
A 2
65-1
10/0
3
C24
V (
ac)
R
N11
5 V
(ac
)
Cla
ss II
Tran
sfor
mer
L
Do
not a
pply
pow
er
1213
Com –
5A5A
5A5A
5A5A
5A5A
Boil
Sup
Boil
Ret
Out +
UnO Sw
+–
Prim P1
Boil
Dem
Com
Dem
12
34
56
78
910
1114
1516
1718
1920
2122
2324
2526
2728
2930
Setp
/D
HW31
Mod
1 m
A+
–M
od2
mA
+–
Mod
3 m
AL
NPo
wer
11
Boile
r2
2Bo
iler
C.A
./Al
arm
Boile
r 3/
DH
WBo
iler
Pum
p 1
Boile
rPu
mp
2Bo
iler
Pum
p 3
265
4-20
mA
inpu
t
S1 S2 S
3
P4
P1
P2
P3
A1
Boi
ler
#1B
oile
r#2
Boi
ler
#3B
oile
r#1
Boi
ler
#2B
oile
r#3
A1
= A
larm
P1
= B
oile
r P
ump
1P
2 =
Boi
ler
Pum
p 2
P3
= B
oile
r P
ump
3P
4 =
Sys
tem
Pum
pS
1 =
Boi
ler
Sup
ply
Sen
sor
071
S2
= B
oile
r R
etur
n S
enso
r 07
1S
3 =
Out
door
Sen
sor
070
Stan
d Al
one
Adva
nced
Exte
rnal
Inpu
t
Off
C.A.O
ffAl
arm
Fixe
d Le
adFi
rst O
n / L
ast O
ff
Firs
t On
/ Firs
t Off
Soft
Stop
Rota
tePa
ralle
l
Inst
alle
r
Exer
cise
Sequ
entia
l
requ
ired
optio
nal
© 2003 A 265 - 10/03 4 of 12
Co
nce
pt
Dra
win
gT
his
is o
nly
a co
ncep
t dra
win
g, n
ot a
n en
gine
ered
dra
win
g. It
is n
ot in
tend
ed to
de
scrib
e a
com
plet
e sy
stem
, no
r an
y pa
rtic
ular
sys
tem
. It
is u
p to
the
sys
tem
de
sign
er t
o de
term
ine
the
nece
ssar
y co
mpo
nent
s fo
r an
d co
nfig
urat
ion
of t
he
part
icul
ar s
yste
m b
eing
des
igne
d, i
nclu
ding
add
ition
al e
quip
men
t, is
olat
ion
rela
ys (
for
load
s gr
eate
r th
an t
he c
ontr
ol’s
spe
cifie
d ou
tput
rat
ings
), a
nd a
ny
safe
ty d
evic
es w
hich
in th
e ju
dgem
ent o
f the
des
igne
r ar
e ap
prop
riate
, in
orde
r to
pro
perly
siz
e, c
onfig
ure
and
desi
gn t
hat
syst
em a
nd t
o en
sure
com
plia
nce
with
bui
ldin
g an
d sa
fety
cod
e re
quire
men
ts.
tekm
ar C
ontr
ol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontr
ol S
yste
ms,
Inc.
, U.S
.A.;
ww
w.t
ekm
arco
ntr
ols
.co
mH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad
, Ver
no
n, B
.C. C
anad
a, V
1B 3
K4;
(25
0) 5
45-7
749
Fax
(25
0) 5
45-0
650
- A
pp
licat
ion
Mec
han
ical
P3
P2
P1
MC
ombu
stio
nA
ir D
ampe
r (C
1)O
utdo
or S
enso
r(S
3) 0
70
150
115
V (
ac)
24 V
(ac
)
Cla
ss II
Tran
sfor
mer
265
tekm
ar 5
00 s
erie
sth
erm
osta
ts
P4
Z1
Z2
∆P V1
Boi
ler
Ret
urn
Sen
sor
(S2)
071Boi
ler
Sup
ply
Sen
sor
(S1)
071
R1
Set
poin
tS
enso
r (S
4)
P5
A 2
65-2
10/0
3
C1
= C
ombu
stio
n A
ir D
amp
erP
1 =
Boi
ler
Pum
p 1
P2
= B
oile
r P
ump
2P
3 =
Boi
ler
Pum
p 3
P4
= S
yste
m P
ump
P5
= S
etp
oint
Tem
per
atur
e P
ump
S1
= B
oile
r S
uppl
y S
enso
r 07
1S
2 =
Boi
ler
Ret
urn
Sen
sor
071
S3
= O
utdo
or S
enso
r 07
0S
4 =
Set
poi
nt S
enso
r 07
1R
1 =
Rel
ay 0
03V
1 =
Pre
ssur
e D
iffer
entia
l Byp
ass
Val
veZ
1, Z
2 =
Zon
e V
alve
s
Sys
tem
Op
erat
ion
The
Boi
ler C
ontr
ol 2
65 p
rovi
des
outd
oor r
eset
to a
spa
ce h
eatin
g sy
stem
and
a s
etpo
int l
oad.
The
265
pro
vide
s m
odul
atio
n to
thre
e m
odul
atin
g bo
ilers
. The
boi
lers
are
pip
ed in
prim
ary-
seco
ndar
y an
d th
e bo
iler
pum
ps a
re c
ontr
olle
d by
the
265
to
allo
w fo
r po
st p
urgi
ng o
f the
boi
lers
afte
r th
ey h
ave
shut
off.
A c
ombu
stio
n ai
r da
mpe
r is
als
o co
ntro
lled
by th
e 26
5.
5 of 12 © 2003 A 265 - 10/03
Co
nce
pt
Dra
win
gT
his
is o
nly
a co
ncep
t dra
win
g, n
ot a
n en
gine
ered
dra
win
g. It
is n
ot in
tend
ed to
de
scrib
e a
com
plet
e sy
stem
, no
r an
y pa
rtic
ular
sys
tem
. It
is u
p to
the
sys
tem
de
sign
er t
o de
term
ine
the
nece
ssar
y co
mpo
nent
s fo
r an
d co
nfig
urat
ion
of t
he
part
icul
ar s
yste
m b
eing
des
igne
d, i
nclu
ding
add
ition
al e
quip
men
t, is
olat
ion
rela
ys (
for
load
s gr
eate
r th
an t
he c
ontr
ol’s
spe
cifie
d ou
tput
rat
ings
), a
nd a
ny
safe
ty d
evic
es w
hich
in th
e ju
dgem
ent o
f the
des
igne
r ar
e ap
prop
riate
, in
orde
r to
pro
perly
siz
e, c
onfig
ure
and
desi
gn t
hat
syst
em a
nd t
o en
sure
com
plia
nce
with
bui
ldin
g an
d sa
fety
cod
e re
quire
men
ts.
tekm
ar C
ontr
ol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontr
ol S
yste
ms,
Inc.
, U.S
.A.;
ww
w.t
ekm
arco
ntr
ols
.co
mH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad
, Ver
no
n, B
.C. C
anad
a, V
1B 3
K4;
(25
0) 5
45-7
749
Fax
(25
0) 5
45-0
650
- A
pp
licat
ion
Ele
ctri
cal
Ess
enti
al C
on
tro
l Set
tin
gs
DH
W M
OD
E =
OF
FS
etpo
int M
OD
E =
1
(no
prio
rity)
2
(prio
rity)
C24
V (
ac)
R
N11
5 V
(ac
)
Cla
ss II
Tran
sfor
mer
L
Do
not a
pply
pow
er
1213
Com –
5A5A
5A5A
5A5A
5A5A
Boil
Sup
Boil
Ret
Out +
UnO Sw
+–
Prim P1
Boil
Dem
Com
Dem
12
34
56
78
910
1114
1516
1718
1920
2122
2324
2526
2728
2930
Setp
/D
HW31
Mod
1 m
A+
–M
od2
mA
+–
Mod
3 m
AL
NPo
wer
11
Boile
r2
2Bo
iler
C.A
./Al
arm
Boile
r 3/
DH
WBo
iler
Pum
p 1
Boile
rPu
mp
2Bo
iler
Pum
p 3
265
Boi
ler
#1B
oile
r#2
Boi
ler
#34-
20 m
Ain
put
Boi
ler
#1B
oile
r#2
Boi
ler
#3
S1 S2 S
3
P4
P5
R1
P1
P2
P3
7 8 1 2
6 5 4 3
S4
C-
8A
No
Pow
er
R+
Com
N/O
N/C
12
34
56
7
Sens
orPo
wer
150
On
Off
Z1
MZ
2
M
MC
1
R
tekm
ar 5
00 S
erie
sTh
erm
osta
ts
CR
elay
1R
tekm
ar 5
00 S
erie
sTh
erm
osta
ts
CR
elay
1
A 2
65-2
10/0
3
C1
= C
ombu
stio
n A
ir D
amp
erP
1 =
Boi
ler
Pum
p 1
P2
= B
oile
r P
ump
2P
3 =
Boi
ler
Pum
p 3
P4
= S
yste
m P
ump
P5
= S
etp
oint
Tem
per
atur
e P
ump
S1
= B
oile
r S
uppl
y S
enso
r 07
1S
2 =
Boi
ler
Ret
urn
Sen
sor
071
S3
= O
utdo
or S
enso
r 07
0S
4 =
Set
poi
nt S
enso
r 07
1R
1 =
Rel
ay 0
03Z
1, Z
2 =
Zon
e V
alve
s
Stan
d Al
one
Adva
nced
Exte
rnal
Inpu
t
Off
C.A.O
ffAl
arm
Fixe
d Le
adFi
rst O
n / L
ast O
ff
Firs
t On
/ Firs
t Off
Soft
Stop
Rota
tePa
ralle
l
Inst
alle
r
Exer
cise
Sequ
entia
l
requ
ired
optio
nal
© 2003 A 265 - 10/03 6 of 12
Co
nce
pt
Dra
win
gT
his
is o
nly
a co
ncep
t dra
win
g, n
ot a
n en
gine
ered
dra
win
g. It
is n
ot in
tend
ed to
de
scrib
e a
com
plet
e sy
stem
, no
r an
y pa
rtic
ular
sys
tem
. It
is u
p to
the
sys
tem
de
sign
er t
o de
term
ine
the
nece
ssar
y co
mpo
nent
s fo
r an
d co
nfig
urat
ion
of t
he
part
icul
ar s
yste
m b
eing
des
igne
d, i
nclu
ding
add
ition
al e
quip
men
t, is
olat
ion
rela
ys (
for
load
s gr
eate
r th
an t
he c
ontr
ol’s
spe
cifie
d ou
tput
rat
ings
), a
nd a
ny
safe
ty d
evic
es w
hich
in th
e ju
dgem
ent o
f the
des
igne
r ar
e ap
prop
riate
, in
orde
r to
pro
perly
siz
e, c
onfig
ure
and
desi
gn t
hat
syst
em a
nd t
o en
sure
com
plia
nce
with
bui
ldin
g an
d sa
fety
cod
e re
quire
men
ts.
tekm
ar C
ontr
ol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontr
ol S
yste
ms,
Inc.
, U.S
.A.;
ww
w.t
ekm
arco
ntr
ols
.co
mH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad
, Ver
no
n, B
.C. C
anad
a, V
1B 3
K4;
(25
0) 5
45-7
749
Fax
(25
0) 5
45-0
650
- A
pp
licat
ion
Mec
han
ical
P3
P2
P1
Boi
ler
Ret
urn
Sen
sor
(S2)
071B
oile
r S
uppl
yS
enso
r (S
1) 0
71P
4
Ala
rm (
A1)
115
V (
ac)
Ana
log
Inpu
t fro
m E
MS
24 V
(ac
)
Cla
ss II
Tran
sfor
mer
265
A 2
65-3
10/0
3
A1
= A
larm
P1
= B
oile
r P
ump
1P
2 =
Boi
ler
Pum
p 2
P3
= B
oile
r P
ump
3P
4 =
Sys
tem
Pum
pS
1 =
Boi
ler
Sup
ply
Sen
sor
071
S2
= B
oile
r R
etur
n S
enso
r 07
1
Sys
tem
Op
erat
ion
An
Ene
rgy
Man
agem
ent (
EM
S)
prov
ides
the
Boi
ler
Con
trol
265
the
Boi
ler
Targ
et te
mpe
ratu
re u
sing
a 0
to 1
0 V
(dc
) or
2
to 1
0 V
(dc
) si
gnal
. T
he b
oile
rs a
re p
iped
in p
rimar
y-se
cond
ary
and
the
boile
r pu
mps
are
con
trol
led
by t
he 2
65 to
allo
w
post
pur
ging
of
the
boile
rs a
fter
they
hav
e sh
ut o
ff. T
he 2
65 h
as a
n al
arm
con
tact
whi
ch c
lose
s w
hen
ther
e is
an
erro
r m
essa
ge.
7 of 12 © 2003 A 265 - 10/03
Co
nce
pt
Dra
win
gT
his
is o
nly
a co
ncep
t dra
win
g, n
ot a
n en
gine
ered
dra
win
g. It
is n
ot in
tend
ed to
de
scrib
e a
com
plet
e sy
stem
, no
r an
y pa
rtic
ular
sys
tem
. It
is u
p to
the
sys
tem
de
sign
er t
o de
term
ine
the
nece
ssar
y co
mpo
nent
s fo
r an
d co
nfig
urat
ion
of t
he
part
icul
ar s
yste
m b
eing
des
igne
d, i
nclu
ding
add
ition
al e
quip
men
t, is
olat
ion
rela
ys (
for
load
s gr
eate
r th
an t
he c
ontr
ol’s
spe
cifie
d ou
tput
rat
ings
), a
nd a
ny
safe
ty d
evic
es w
hich
in th
e ju
dgem
ent o
f the
des
igne
r ar
e ap
prop
riate
, in
orde
r to
pro
perly
siz
e, c
onfig
ure
and
desi
gn t
hat
syst
em a
nd t
o en
sure
com
plia
nce
with
bui
ldin
g an
d sa
fety
cod
e re
quire
men
ts.
tekm
ar C
ontr
ol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontr
ol S
yste
ms,
Inc.
, U.S
.A.;
ww
w.t
ekm
arco
ntr
ols
.co
mH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad
, Ver
no
n, B
.C. C
anad
a, V
1B 3
K4;
(25
0) 5
45-7
749
Fax
(25
0) 5
45-0
650
- A
pp
licat
ion
Ele
ctri
cal
Ess
enti
al C
on
tro
l Set
tin
gs
C24
V (
ac)
R
N11
5 V
(ac
)
Cla
ss II
Tran
sfor
mer
L
Do
not a
pply
pow
er
1213
Com –
5A5A
5A5A
5A5A
5A5A
Boil
Sup
Boil
Ret
Out +
UnO Sw
+–
Prim P1
Boil
Dem
Com
Dem
12
34
56
78
910
1114
1516
1718
1920
2122
2324
2526
2728
2930
Setp
/D
HW31
Mod
1 m
A+
–M
od2
mA
+–
Mod
3 m
AL
NPo
wer
11
Boile
r2
2Bo
iler
C.A
./Al
arm
Boile
r 3/
DH
WBo
iler
Pum
p 1
Boile
rPu
mp
2Bo
iler
Pum
p 3
265
S1 S2
500Ω
0-20
mA
or 0
-10
V (
dc)
P4
P1
P2
P3
A1
4-20
mA
inpu
t
Boi
ler
#1B
oile
r#2
Boi
ler
#3B
oile
r#1
Boi
ler
#2B
oile
r#3
A 2
65-3
10/0
3
A1
= A
larm
P1
= B
oile
r P
ump
1P
2 =
Boi
ler
Pum
p 2
P3
= B
oile
r P
ump
3P
4 =
Sys
tem
Pum
pS
1 =
Boi
ler
Sup
ply
Sen
sor
071
S2
= B
oile
r R
etur
n S
enso
r 07
1
Stan
d Al
one
Adva
nced
Exte
rnal
Inpu
t
Off
C.A.O
ffAl
arm
Fixe
d Le
adFi
rst O
n / L
ast O
ff
Firs
t On
/ Firs
t Off
Soft
Stop
Rota
tePa
ralle
l
Inst
alle
r
Exer
cise
Sequ
entia
l
requ
ired
optio
nal
© 2003 A 265 - 10/03 8 of 12
Co
nce
pt
Dra
win
gT
his
is o
nly
a co
ncep
t dra
win
g, n
ot a
n en
gine
ered
dra
win
g. It
is n
ot in
tend
ed to
de
scrib
e a
com
plet
e sy
stem
, no
r an
y pa
rtic
ular
sys
tem
. It
is u
p to
the
sys
tem
de
sign
er t
o de
term
ine
the
nece
ssar
y co
mpo
nent
s fo
r an
d co
nfig
urat
ion
of t
he
part
icul
ar s
yste
m b
eing
des
igne
d, i
nclu
ding
add
ition
al e
quip
men
t, is
olat
ion
rela
ys (
for
load
s gr
eate
r th
an t
he c
ontr
ol’s
spe
cifie
d ou
tput
rat
ings
), a
nd a
ny
safe
ty d
evic
es w
hich
in th
e ju
dgem
ent o
f the
des
igne
r ar
e ap
prop
riate
, in
orde
r to
pro
perly
siz
e, c
onfig
ure
and
desi
gn t
hat
syst
em a
nd t
o en
sure
com
plia
nce
with
bui
ldin
g an
d sa
fety
cod
e re
quire
men
ts.
tekm
ar C
ontr
ol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontr
ol S
yste
ms,
Inc.
, U.S
.A.;
ww
w.t
ekm
arco
ntr
ols
.co
mH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad
, Ver
no
n, B
.C. C
anad
a, V
1B 3
K4;
(25
0) 5
45-7
749
Fax
(25
0) 5
45-0
650
- A
pp
licat
ion
Mec
han
ical
P2
P1
MC
ombu
stio
nA
ir D
ampe
r (C
1)O
utdo
or S
enso
r(S
3) 0
70
115
V (
ac)
24 V
(ac
)
Cla
ss II
Tran
sfor
mer
265
tekm
ar 5
00 s
erie
sth
erm
osta
ts
P3
Z1
Z2
∆P V1
Boi
ler
Ret
urn
Sen
sor
(S2)
071Boi
ler
Sup
ply
Sen
sor
(S1)
071
A1
P4
DH
WTa
nk
A 2
65-4
10/0
3
A1
= A
quas
tat
C1
= C
ombu
stio
n A
ir D
amp
erP
1 =
Boi
ler
Pum
p 1
P2
= B
oile
r P
ump
2P
3 =
Sys
tem
Pum
pP
4 =
DH
W P
ump
S1
= B
oile
r S
uppl
y S
enso
r 07
1S
2 =
Boi
ler
Ret
urn
Sen
sor
071
S3
= O
utdo
or S
enso
r 07
0Z
1, Z
2 =
Zon
e V
alve
s
Sys
tem
Op
erat
ion
The
Boi
ler
Con
trol
265
pro
vide
s ou
tdoo
r re
set t
o a
spac
e he
atin
g sy
stem
and
dom
estic
hot
wat
er lo
ad. T
he 2
65 p
rovi
des
mod
ulat
ion
to t
wo
mod
ulat
ing
boile
rs.
The
boi
lers
are
pip
ed in
prim
ary-
seco
ndar
y an
d th
e bo
iler
pum
ps a
re c
ontr
olle
d by
the
265
to a
llow
for
post
pur
ging
of t
he b
oile
rs a
fter
they
hav
e sh
ut o
ff. A
com
bust
ion
air
dam
per
is a
lso
cont
rolle
d by
th
e 26
5.
9 of 12 © 2003 A 265 - 10/03
Co
nce
pt
Dra
win
gT
his
is o
nly
a co
ncep
t dra
win
g, n
ot a
n en
gine
ered
dra
win
g. It
is n
ot in
tend
ed to
de
scrib
e a
com
plet
e sy
stem
, no
r an
y pa
rtic
ular
sys
tem
. It
is u
p to
the
sys
tem
de
sign
er t
o de
term
ine
the
nece
ssar
y co
mpo
nent
s fo
r an
d co
nfig
urat
ion
of t
he
part
icul
ar s
yste
m b
eing
des
igne
d, i
nclu
ding
add
ition
al e
quip
men
t, is
olat
ion
rela
ys (
for
load
s gr
eate
r th
an t
he c
ontr
ol’s
spe
cifie
d ou
tput
rat
ings
), a
nd a
ny
safe
ty d
evic
es w
hich
in th
e ju
dgem
ent o
f the
des
igne
r ar
e ap
prop
riate
, in
orde
r to
pro
perly
siz
e, c
onfig
ure
and
desi
gn t
hat
syst
em a
nd t
o en
sure
com
plia
nce
with
bui
ldin
g an
d sa
fety
cod
e re
quire
men
ts.
tekm
ar C
ontr
ol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontr
ol S
yste
ms,
Inc.
, U.S
.A.;
ww
w.t
ekm
arco
ntr
ols
.co
mH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad
, Ver
no
n, B
.C. C
anad
a, V
1B 3
K4;
(25
0) 5
45-7
749
Fax
(25
0) 5
45-0
650
- A
pp
licat
ion
Ele
ctri
cal
C24
V (
ac)
R
N11
5 V
(ac
)
Cla
ss II
Tran
sfor
mer
L
Do
not a
pply
pow
er
1213
Com –
5A5A
5A5A
5A5A
5A5A
Boil
Sup
Boil
Ret
Out +
UnO Sw
+–
Prim P1
Boil
Dem
Com
Dem
12
34
56
78
910
1114
1516
1718
1920
2122
2324
2526
2728
2930
Setp
/D
HW31
Mod
1 m
A+
–M
od2
mA
+–
Mod
3 m
AL
NPo
wer
11
Boile
r2
2Bo
iler
C.A
./Al
arm
Boile
r 3/
DH
WBo
iler
Pum
p 1
Boile
rPu
mp
2Bo
iler
Pum
p 3
265
Boi
ler
#1B
oile
r#2
4-20
mA
inpu
t
Boi
ler
#1B
oile
r#2
S1 S2 S
3
P3
P4
P1
P2
Z1
MZ
2
M
MC
1A
1
R
tekm
ar 5
00 S
erie
sTh
erm
osta
ts
CR
elay
1R
tekm
ar 5
00 S
erie
sTh
erm
osta
ts
CR
elay
1
A 2
65-4
10/0
3
A1
= A
quas
tat
C1
= C
ombu
stio
n A
ir D
amp
erP
1 =
Boi
ler
Pum
p 1
P2
= B
oile
r P
ump
2P
3 =
Sys
tem
Pum
pP
4 =
DH
W P
ump
S1
= B
oile
r S
uppl
y S
enso
r 07
1S
2 =
Boi
ler
Ret
urn
Sen
sor
071
S3
= O
utdo
or S
enso
r 07
0V
1 =
Pre
ssur
e D
iffer
entia
l Byp
ass
Val
veZ
1, Z
2 =
Zon
e V
alve
s
Ess
enti
al C
on
tro
l Set
tin
gs
Boi
l 3 =
OF
FD
HW
MO
DE
= 1
(no
prio
rity)
2
(prio
rity)
Stan
d Al
one
Adva
nced
Exte
rnal
Inpu
t
Off
C.A.O
ffAl
arm
Fixe
d Le
adFi
rst O
n / L
ast O
ff
Firs
t On
/ Firs
t Off
Soft
Stop
Rota
tePa
ralle
l
Inst
alle
r
Exer
cise
Sequ
entia
l
requ
ired
optio
nal
© 2003 A 265 - 10/03 10 of 12
Co
nce
pt
Dra
win
gT
his
is o
nly
a co
ncep
t dra
win
g, n
ot a
n en
gine
ered
dra
win
g. It
is n
ot in
tend
ed to
de
scrib
e a
com
plet
e sy
stem
, no
r an
y pa
rtic
ular
sys
tem
. It
is u
p to
the
sys
tem
de
sign
er t
o de
term
ine
the
nece
ssar
y co
mpo
nent
s fo
r an
d co
nfig
urat
ion
of t
he
part
icul
ar s
yste
m b
eing
des
igne
d, i
nclu
ding
add
ition
al e
quip
men
t, is
olat
ion
rela
ys (
for
load
s gr
eate
r th
an t
he c
ontr
ol’s
spe
cifie
d ou
tput
rat
ings
), a
nd a
ny
safe
ty d
evic
es w
hich
in th
e ju
dgem
ent o
f the
des
igne
r ar
e ap
prop
riate
, in
orde
r to
pro
perly
siz
e, c
onfig
ure
and
desi
gn t
hat
syst
em a
nd t
o en
sure
com
plia
nce
with
bui
ldin
g an
d sa
fety
cod
e re
quire
men
ts.
tekm
ar C
ontr
ol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontr
ol S
yste
ms,
Inc.
, U.S
.A.;
ww
w.t
ekm
arco
ntr
ols
.co
mH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad
, Ver
no
n, B
.C. C
anad
a, V
1B 3
K4;
(25
0) 5
45-7
749
Fax
(25
0) 5
45-0
650
- A
pp
licat
ion
Mec
han
ical
P2
P1
MC
ombu
stio
nA
ir D
ampe
r (C
1)O
utdo
or S
enso
r(S
3) 0
70
115
V (
ac)
24 V
(ac
)
Cla
ss II
Tran
sfor
mer
265
tekm
ar 5
00 s
erie
sth
erm
osta
ts
P3
P5
P6
Boi
ler
Ret
urn
Sen
sor
(S2)
071Boi
ler
Sup
ply
Sen
sor
(S1)
071
A1
P4
DH
WTa
nk
R3
R2
R1
A 2
65-5
10/0
3
A1
= A
quas
tat
C1
= C
ombu
stio
n A
ir D
amp
erP
1 =
Boi
ler
Pum
p 1
P2
= B
oile
r P
ump
2P
3 =
Sys
tem
Pum
pP
4 =
DH
W P
ump
P5,
P6
= Z
one
Pum
psR
1 =
Rel
ay 0
04R
2, R
3 =
Rel
ay 0
03S
1 =
Boi
ler
Sup
ply
Sen
sor
071
S2
= B
oile
r R
etur
n S
enso
r 07
1S
3 =
Out
door
Sen
sor
070
Sys
tem
Op
erat
ion
The
Boi
ler C
ontr
ol 2
65 p
rovi
des
outd
oor r
eset
to a
spa
ce h
eatin
g sy
stem
and
dom
estic
hot
wat
er lo
ad w
ith a
ll zo
nes
pipe
d in
prim
ary-
seco
ndar
y. T
he 2
65 p
rovi
des
mod
ulat
ion
to tw
o m
odul
atin
g bo
ilers
. The
boi
lers
are
pip
ed in
prim
ary-
seco
ndar
y an
d th
e bo
iler
pum
ps a
re c
ontr
olle
d by
the
265
to
allo
w f
or p
ost
purg
ing
of t
he b
oile
rs a
fter
they
hav
e sh
ut o
ff. A
com
-bu
stio
n ai
r da
mpe
r is
als
o co
ntro
lled
by th
e 26
5. T
he d
omes
tic h
ot w
ater
tank
is p
iped
in p
rimar
y-se
cond
ary
and
has
an
exte
rnal
rel
ay to
pro
vide
prio
rity
over
the
spac
e he
atin
g.
11 of 12 © 2003 A 265 - 10/03
Co
nce
pt
Dra
win
gT
his
is o
nly
a co
ncep
t dra
win
g, n
ot a
n en
gine
ered
dra
win
g. It
is n
ot in
tend
ed to
de
scrib
e a
com
plet
e sy
stem
, no
r an
y pa
rtic
ular
sys
tem
. It
is u
p to
the
sys
tem
de
sign
er t
o de
term
ine
the
nece
ssar
y co
mpo
nent
s fo
r an
d co
nfig
urat
ion
of t
he
part
icul
ar s
yste
m b
eing
des
igne
d, i
nclu
ding
add
ition
al e
quip
men
t, is
olat
ion
rela
ys (
for
load
s gr
eate
r th
an t
he c
ontr
ol’s
spe
cifie
d ou
tput
rat
ings
), a
nd a
ny
safe
ty d
evic
es w
hich
in th
e ju
dgem
ent o
f the
des
igne
r ar
e ap
prop
riate
, in
orde
r to
pro
perly
siz
e, c
onfig
ure
and
desi
gn t
hat
syst
em a
nd t
o en
sure
com
plia
nce
with
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quire
men
ts.
tekm
ar C
ontr
ol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
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ms,
Inc.
, U.S
.A.;
ww
w.t
ekm
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ntr
ols
.co
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Off
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510
0 S
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Sta
r R
oad
, Ver
no
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.C. C
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1B 3
K4;
(25
0) 5
45-7
749
Fax
(25
0) 5
45-0
650
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12
34
56
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1718
1920
2122
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2526
2728
2930
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Product design, software and literature are Copyright © 2003 by:tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
All specifications are subject to change without notice.Printed in Canada. A 265 - 10/03.
12 of 12
Specifi cations
tekmar Control Systems Ltd., Canadatekmar Control Systems, Inc., U.S.A.Head Office: 5100 Silver Star RoadVernon, B.C. Canada V1B 3K4(250) 545-7749 Fax. (250) 545-0650Web Site: www.tekmarcontrols.com
The following are the recommended specifications for the Boiler Control 265
• The control shall be able to operate one, two, or three modulating boilers.
• The control shall be able to operate one or two boilers during a call for domestic hot water heating.
• The control shall have the ability to calculate the boilers’ target temperature based on outdoor reset.
• The control shall have the ability to have the boilers’ target temperature set using an adjustable setpoint.
• The control shall have an adjustable warm weather shut down. The warm weather shut down only applies to outdoor reset operation.
• The control shall have a primary pump contact that operates during a call for space heating.
• The control shall have the ability to operate a domestic hot water contact that operates during a domestic hot water call.
• The control shall have the ability to display the current temperature difference between the return temperature and the supply temperature, ∆T.
• The control shall have an option to rotate the firing sequence of the boilers and the option for rotating the boiler firing sequence shall be based on the boilers’ accumulated running hours.
• The control shall use proportional, integral and derivative (PID) logic when modulating the boilers.
• The control shall have the option to modulate the boilers in sequential order.
• The control shall have the option to modulate the boilers in parallel.
• The control shall have an adjustable Minimum Supply water temperature setting to help prevent condensation of flue gases and subsequent corrosion and blockage of the boiler’s heat exchanger and chimney.
• The control shall have the option of an automatic differential calculation in order to prevent short cycling of the boilers.
• The control shall have the ability to operate a primary pump plus individual boiler pumps.
• The boiler pumps shall have an adjustable post purge setting that allows the pump to run for a set period after the boiler has been shut off.
• The control shall have the option for a fixed lead rotation and when this option is selected, the control shall have an option for either a first on / first off, or first on / last off modulating sequence.
• The control shall have the option for either an alarm output or a combustion air damper output. If the combustion air damper is selected, the control shall have an adjustable combustion air damper opening time.
• The control shall have an adjustable minimum inter-stage delay that can be set manually or calculated automatically by the control.
• The control shall have the option of accepting a 0 – 10 V(dc) input signal from an energy management system.
• When operating with a 0 – 10 V(dc) signal, the control shall have an adjustable offset as well as an adjustable input range.
• The control shall have two separate lockable access levels to limit the number of setting adjustments available to various users.
• The control shall have a test button that activates a pre-programmed test sequence testing all the control’s outputs.
• The control shall have the ability to show the current outdoor, boiler supply, and boiler return temperatures.
• The control shall continually monitor the temperature sensors and provide an error message upon a control or sensor failure.
• The control shall record and display the running hours of each boiler.
• During extended periods of inactivity, the pumps or valves that are operated by the control shall be periodically exercised to prevent seizure during long idle periods.
• The control shall have the option to gradually modulate the boilers down to low fire before the boilers are shut off.
• The control shall have three 4 – 20 mA or 0 – 20 mA modulating external outputs.
• The control shall have the field upgradable option of converting the modulating output to 0 – 10 V(dc), 2 – 10 V(dc) and 0 - 135 Ω.
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