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1 of 12 © 2010 A 265 - 07/10
- Application BrochureBoiler Control 265
A 26507/10
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 alert.
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
© 2010 A 265 - 07/10 2 of 12
Con
cept
Dra
win
gTh
is is
onl
y a
conc
ept d
raw
ing,
not
an
engi
neer
ed d
raw
ing.
It is
not
inte
nded
to
desc
ribe
a co
mpl
ete
syst
em,
nor
any
part
icul
ar s
yste
m.
It is
up
to t
he s
yste
m
desi
gner
to
dete
rmin
e th
e ne
cess
ary
com
pone
nts
for
and
conf
igur
atio
n of
the
pa
rtic
ular
sys
tem
bei
ng d
esig
ned,
inc
ludi
ng a
dditi
onal
equ
ipm
ent,
isol
atio
n re
lays
(fo
r lo
ads
grea
ter
than
the
con
trol’s
spe
cifie
d ou
tput
rat
ings
), an
d an
y sa
fety
dev
ices
whi
ch in
the
judg
emen
t of t
he d
esig
ner
are
appr
opria
te, i
n or
der
to p
rope
rly s
ize,
con
figur
e an
d de
sign
tha
t sy
stem
and
to
ensu
re c
ompl
ianc
e w
ith b
uild
ing
and
safe
ty c
ode
requ
irem
ents
.te
kmar
Con
trol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontro
l Sys
tem
s, In
c., U
.S.A
.; w
ww
.tekm
arco
ntro
ls.c
omH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad,
Ver
non,
B.C
. Can
ada,
V1B
3K
4; (2
50) 5
45-7
749
Fax
(250
) 545
-065
0
- App
licat
ion
Mec
hani
cal
Sys
tem
Ope
ratio
nTh
e B
oile
r C
ontro
l 265
pro
vide
s ou
tdoo
r re
set t
o a
spac
e he
atin
g sy
stem
. Lin
e vo
ltage
is u
sed
to p
rovi
de a
per
man
ent
boile
r de
man
d. T
he b
oile
rs a
re p
iped
in p
rimar
y-se
cond
ary
and
the
boile
r pu
mps
are
con
trolle
d by
the
265
to a
llow
pos
t pu
rgin
g of
the
boile
rs a
fter t
hey
have
shu
t off.
The
con
trol h
as a
n al
ert c
onta
ct w
hich
clo
ses
whe
n th
ere
is a
n er
ror 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 =
Ale
rtP
1 =
Boi
ler P
ump
1P
2 =
Boi
ler P
ump
2P
3 =
Boi
ler P
ump
3P
4 =
Sys
tem
Pum
pS
1 =
Boi
ler S
uppl
y S
enso
r 071
S2
= B
oile
r Ret
urn
Sen
sor 0
71S
3 =
Out
door
Sen
sor 0
70
A 2
65-1
07/1
0
Out
door
Sen
sor
(S3)
070
115
V (a
c)24
V (a
c)
Cla
ss 2
Tran
sfor
mer
265
P3
P2
P1
Boi
ler R
etur
nS
enso
r (S
2) 0
71Boi
ler S
uppl
yS
enso
r (S
1) 0
71P
4
Ale
rt (A
1)
3 of 12 © 2010 A 265 - 07/10
Con
cept
Dra
win
gTh
is is
onl
y a
conc
ept d
raw
ing,
not
an
engi
neer
ed d
raw
ing.
It is
not
inte
nded
to
desc
ribe
a co
mpl
ete
syst
em,
nor
any
part
icul
ar s
yste
m.
It is
up
to t
he s
yste
m
desi
gner
to
dete
rmin
e th
e ne
cess
ary
com
pone
nts
for
and
conf
igur
atio
n of
the
pa
rtic
ular
sys
tem
bei
ng d
esig
ned,
inc
ludi
ng a
dditi
onal
equ
ipm
ent,
isol
atio
n re
lays
(fo
r lo
ads
grea
ter
than
the
con
trol’s
spe
cifie
d ou
tput
rat
ings
), an
d an
y sa
fety
dev
ices
whi
ch in
the
judg
emen
t of t
he d
esig
ner
are
appr
opria
te, i
n or
der
to p
rope
rly s
ize,
con
figur
e an
d de
sign
tha
t sy
stem
and
to
ensu
re c
ompl
ianc
e w
ith b
uild
ing
and
safe
ty c
ode
requ
irem
ents
.te
kmar
Con
trol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontro
l Sys
tem
s, In
c., U
.S.A
.; w
ww
.tekm
arco
ntro
ls.c
omH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad,
Ver
non,
B.C
. Can
ada,
V1B
3K
4; (2
50) 5
45-7
749
Fax
(250
) 545
-065
0
- App
licat
ion
Ele
ctri
cal
Ess
entia
l Con
trol
Set
tings
Boi
l 3 ≠
OFF
A 2
65-1
07/1
0
C24
V (a
c)R
N11
5 V
(ac)
Cla
ss 2
Tran
sfor
mer
L
Do
not a
pply
pow
er
1213
Com –
5A5A
5A5A
5A5A
5A5A
Boil
Sup
Boil
Ret
Out +
UnO
Sw+
–Pr
im P1Bo
ilDe
mCo
mDe
m
12
34
56
78
910
1114
1516
1718
1920
2122
2324
2526
2728
2930
Setp
/DH
W31M
od1
mA
+–
Mod
2 m
A+
–M
od3
mA
LN
Powe
r1
1Bo
iler
22
Boile
rC.
A./
Aler
tBo
iler 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 =
Ale
rtP
1 =
Boi
ler P
ump
1P
2 =
Boi
ler P
ump
2P
3 =
Boi
ler P
ump
3P
4 =
Sys
tem
Pum
pS
1 =
Boi
ler S
uppl
y S
enso
r 071
S2
= B
oile
r Ret
urn
Sen
sor 0
71S
3 =
Out
door
Sen
sor 0
70
Stan
d Al
one
Adva
nced
Exte
rnal
Inpu
t
OffC.
A.OffAl
ert
Fixe
d Le
adFi
rst O
n / L
ast O
ff
Firs
t On
/ Firs
t Off
Soft
Stop
Rota
tePa
ralle
l
Insta
ller
Exer
cise
Sequ
entia
l
requ
ired
optio
nal
© 2010 A 265 - 07/10 4 of 12
Con
cept
Dra
win
gTh
is is
onl
y a
conc
ept d
raw
ing,
not
an
engi
neer
ed d
raw
ing.
It is
not
inte
nded
to
desc
ribe
a co
mpl
ete
syst
em,
nor
any
part
icul
ar s
yste
m.
It is
up
to t
he s
yste
m
desi
gner
to
dete
rmin
e th
e ne
cess
ary
com
pone
nts
for
and
conf
igur
atio
n of
the
pa
rtic
ular
sys
tem
bei
ng d
esig
ned,
inc
ludi
ng a
dditi
onal
equ
ipm
ent,
isol
atio
n re
lays
(fo
r lo
ads
grea
ter
than
the
con
trol’s
spe
cifie
d ou
tput
rat
ings
), an
d an
y sa
fety
dev
ices
whi
ch in
the
judg
emen
t of t
he d
esig
ner
are
appr
opria
te, i
n or
der
to p
rope
rly s
ize,
con
figur
e an
d de
sign
tha
t sy
stem
and
to
ensu
re c
ompl
ianc
e w
ith b
uild
ing
and
safe
ty c
ode
requ
irem
ents
.te
kmar
Con
trol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontro
l Sys
tem
s, In
c., U
.S.A
.; w
ww
.tekm
arco
ntro
ls.c
omH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad,
Ver
non,
B.C
. Can
ada,
V1B
3K
4; (2
50) 5
45-7
749
Fax
(250
) 545
-065
0
- App
licat
ion
Mec
hani
cal
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 (a
c)24
V (a
c)
Cla
ss 2
Tran
sfor
mer
265
tekm
ar 5
00 s
erie
sth
erm
osta
ts
P4
Z1Z2
ΔP V1
Boi
ler R
etur
n S
enso
r(S
2) 0
71Boi
ler S
uppl
y S
enso
r(S
1) 0
71
R1
Set
poin
tS
enso
r (S
4)
P5
A 2
65-2
07/1
0
C1
= C
ombu
stio
n A
ir D
ampe
rP
1 =
Boi
ler P
ump
1P
2 =
Boi
ler P
ump
2P
3 =
Boi
ler P
ump
3P
4 =
Sys
tem
Pum
pP
5 =
Set
poin
t Tem
pera
ture
Pum
pS
1 =
Boi
ler S
uppl
y S
enso
r 071
S2
= B
oile
r Ret
urn
Sen
sor 0
71S
3 =
Out
door
Sen
sor 0
70S
4 =
Set
poin
t Sen
sor 0
71R
1 =
Rel
ay 0
03V
1 =
Pre
ssur
e D
iffer
entia
l Byp
ass
Val
veZ1
, Z2
= Z
one
Val
ves
Sys
tem
Ope
ratio
nTh
e B
oile
r Con
trol 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 p
umps
are
con
trolle
d by
the
265
to
allo
w fo
r pos
t pur
ging
of t
he b
oile
rs a
fter t
hey
have
shu
t off.
A c
ombu
stio
n ai
r dam
per i
s al
so c
ontro
lled
by th
e 26
5.
5 of 12 © 2010 A 265 - 07/10
Con
cept
Dra
win
gTh
is is
onl
y a
conc
ept d
raw
ing,
not
an
engi
neer
ed d
raw
ing.
It is
not
inte
nded
to
desc
ribe
a co
mpl
ete
syst
em,
nor
any
part
icul
ar s
yste
m.
It is
up
to t
he s
yste
m
desi
gner
to
dete
rmin
e th
e ne
cess
ary
com
pone
nts
for
and
conf
igur
atio
n of
the
pa
rtic
ular
sys
tem
bei
ng d
esig
ned,
inc
ludi
ng a
dditi
onal
equ
ipm
ent,
isol
atio
n re
lays
(fo
r lo
ads
grea
ter
than
the
con
trol’s
spe
cifie
d ou
tput
rat
ings
), an
d an
y sa
fety
dev
ices
whi
ch in
the
judg
emen
t of t
he d
esig
ner
are
appr
opria
te, i
n or
der
to p
rope
rly s
ize,
con
figur
e an
d de
sign
tha
t sy
stem
and
to
ensu
re c
ompl
ianc
e w
ith b
uild
ing
and
safe
ty c
ode
requ
irem
ents
.te
kmar
Con
trol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontro
l Sys
tem
s, In
c., U
.S.A
.; w
ww
.tekm
arco
ntro
ls.c
omH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad,
Ver
non,
B.C
. Can
ada,
V1B
3K
4; (2
50) 5
45-7
749
Fax
(250
) 545
-065
0
- App
licat
ion
Ele
ctri
cal
Ess
entia
l Con
trol
Set
tings
DH
W M
OD
E =
OFF
Set
poin
t MO
DE
=
1 (n
o pr
iorit
y)
2 (p
riorit
y)
C24
V (a
c)R
N11
5 V
(ac)
Cla
ss 2
Tran
sfor
mer
L
Do
not a
pply
pow
er
1213
Com –
5A5A
5A5A
5A5A
5A5A
Boil
Sup
Boil
Ret
Out +
UnO
Sw+
–Pr
im P1Bo
ilDe
mCo
mDe
m
12
34
56
78
910
1114
1516
1718
1920
2122
2324
2526
2728
2930
Setp
/DH
W31M
od1
mA
+–
Mod
2 m
A+
–M
od3
mA
LN
Powe
r1
1Bo
iler
22
Boile
rC.
A./
Aler
tBo
iler 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+Co
mN/
ON/
C
12
34
56
7
Sens
orPo
wer
150
On
Off
Z1
MZ2
M
MC
1
R
tekm
ar 5
00 S
erie
sTh
erm
osta
ts
CRe
lay
1R
tekm
ar 5
00 S
erie
sTh
erm
osta
ts
CRe
lay
1
A 2
65-2
07/1
0
C1
= C
ombu
stio
n A
ir D
ampe
rP
1 =
Boi
ler P
ump
1P
2 =
Boi
ler P
ump
2P
3 =
Boi
ler P
ump
3P
4 =
Sys
tem
Pum
pP
5 =
Set
poin
t Tem
pera
ture
Pum
pS
1 =
Boi
ler S
uppl
y S
enso
r 071
S2
= B
oile
r Ret
urn
Sen
sor 0
71S
3 =
Out
door
Sen
sor 0
70S
4 =
Set
poin
t Sen
sor 0
71R
1 =
Rel
ay 0
03Z1
, Z2
= Z
one
Val
ves
Stan
d Al
one
Adva
nced
Exte
rnal
Inpu
t
OffC.
A.OffAl
ert
Fixe
d Le
adFi
rst O
n / L
ast O
ff
Firs
t On
/ Firs
t Off
Soft
Stop
Rota
tePa
ralle
l
Insta
ller
Exer
cise
Sequ
entia
l
requ
ired
optio
nal
© 2010 A 265 - 07/10 6 of 12
Con
cept
Dra
win
gTh
is is
onl
y a
conc
ept d
raw
ing,
not
an
engi
neer
ed d
raw
ing.
It is
not
inte
nded
to
desc
ribe
a co
mpl
ete
syst
em,
nor
any
part
icul
ar s
yste
m.
It is
up
to t
he s
yste
m
desi
gner
to
dete
rmin
e th
e ne
cess
ary
com
pone
nts
for
and
conf
igur
atio
n of
the
pa
rtic
ular
sys
tem
bei
ng d
esig
ned,
inc
ludi
ng a
dditi
onal
equ
ipm
ent,
isol
atio
n re
lays
(fo
r lo
ads
grea
ter
than
the
con
trol’s
spe
cifie
d ou
tput
rat
ings
), an
d an
y sa
fety
dev
ices
whi
ch in
the
judg
emen
t of t
he d
esig
ner
are
appr
opria
te, i
n or
der
to p
rope
rly s
ize,
con
figur
e an
d de
sign
tha
t sy
stem
and
to
ensu
re c
ompl
ianc
e w
ith b
uild
ing
and
safe
ty c
ode
requ
irem
ents
.te
kmar
Con
trol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontro
l Sys
tem
s, In
c., U
.S.A
.; w
ww
.tekm
arco
ntro
ls.c
omH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad,
Ver
non,
B.C
. Can
ada,
V1B
3K
4; (2
50) 5
45-7
749
Fax
(250
) 545
-065
0
- App
licat
ion
Mec
hani
cal
P3
P2
P1
Boi
ler R
etur
nS
enso
r (S
2) 0
71Boi
ler S
uppl
yS
enso
r (S
1) 0
71P
4
Ale
rt (A
1)
115
V (a
c)
Ana
log
Inpu
t fro
m E
MS
24 V
(ac)
Cla
ss 2
Tran
sfor
mer
265
A 2
65-3
07/1
0
A1 =
Ale
rtP
1 =
Boi
ler P
ump
1P
2 =
Boi
ler P
ump
2P
3 =
Boi
ler P
ump
3P
4 =
Sys
tem
Pum
pS
1 =
Boi
ler S
uppl
y S
enso
r 071
S2
= B
oile
r Ret
urn
Sen
sor 0
71
Sys
tem
Ope
ratio
nA
n E
nerg
y M
anag
emen
t (E
MS
) pro
vide
s th
e B
oile
r Con
trol 2
65 th
e B
oile
r Tar
get t
empe
ratu
re u
sing
a 0
to 1
0 V
(dc)
or 2
to
10
V (
dc)
sign
al. T
he b
oile
rs a
re p
iped
in p
rimar
y-se
cond
ary
and
the
boile
r pu
mps
are
con
trolle
d by
the
265
to a
llow
po
st p
urgi
ng o
f th
e bo
ilers
afte
r th
ey h
ave
shut
off.
The
265
has
an
aler
t co
ntac
t w
hich
clo
ses
whe
n th
ere
is a
n er
ror
mes
sage
.
7 of 12 © 2010 A 265 - 07/10
Con
cept
Dra
win
gTh
is is
onl
y a
conc
ept d
raw
ing,
not
an
engi
neer
ed d
raw
ing.
It is
not
inte
nded
to
desc
ribe
a co
mpl
ete
syst
em,
nor
any
part
icul
ar s
yste
m.
It is
up
to t
he s
yste
m
desi
gner
to
dete
rmin
e th
e ne
cess
ary
com
pone
nts
for
and
conf
igur
atio
n of
the
pa
rtic
ular
sys
tem
bei
ng d
esig
ned,
inc
ludi
ng a
dditi
onal
equ
ipm
ent,
isol
atio
n re
lays
(fo
r lo
ads
grea
ter
than
the
con
trol’s
spe
cifie
d ou
tput
rat
ings
), an
d an
y sa
fety
dev
ices
whi
ch in
the
judg
emen
t of t
he d
esig
ner
are
appr
opria
te, i
n or
der
to p
rope
rly s
ize,
con
figur
e an
d de
sign
tha
t sy
stem
and
to
ensu
re c
ompl
ianc
e w
ith b
uild
ing
and
safe
ty c
ode
requ
irem
ents
.te
kmar
Con
trol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontro
l Sys
tem
s, In
c., U
.S.A
.; w
ww
.tekm
arco
ntro
ls.c
omH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad,
Ver
non,
B.C
. Can
ada,
V1B
3K
4; (2
50) 5
45-7
749
Fax
(250
) 545
-065
0
- App
licat
ion
Ele
ctri
cal
Ess
entia
l Con
trol
Set
tings
C24
V (a
c)R
N11
5 V
(ac)
Cla
ss 2
Tran
sfor
mer
L
Do
not a
pply
pow
er
1213
Com –
5A5A
5A5A
5A5A
5A5A
Boil
Sup
Boil
Ret
Out +
UnO
Sw+
–Pr
im P1Bo
ilDe
mCo
mDe
m
12
34
56
78
910
1114
1516
1718
1920
2122
2324
2526
2728
2930
Setp
/DH
W31M
od1
mA
+–
Mod
2 m
A+
–M
od3
mA
LN
Powe
r1
1Bo
iler
22
Boile
rC.
A./
Aler
tBo
iler 3
/DH
WBo
iler
Pum
p 1
Boile
rPu
mp
2Bo
iler
Pum
p 3
S1 S2
500Ω
0-20
mA
or 0
-10
V (d
c)
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
265A
265
-307
/10
A1 =
Ale
rtP
1 =
Boi
ler P
ump
1P
2 =
Boi
ler P
ump
2P
3 =
Boi
ler P
ump
3P
4 =
Sys
tem
Pum
pS
1 =
Boi
ler S
uppl
y S
enso
r 071
S2
= B
oile
r Ret
urn
Sen
sor 0
71
Stan
d Al
one
Adva
nced
Exte
rnal
Inpu
t
OffC.
A.OffAl
ert
Fixe
d Le
adFi
rst O
n / L
ast O
ff
Firs
t On
/ Firs
t Off
Soft
Stop
Rota
tePa
ralle
l
Insta
ller
Exer
cise
Sequ
entia
l
requ
ired
optio
nal
© 2010 A 265 - 07/10 8 of 12
Con
cept
Dra
win
gTh
is is
onl
y a
conc
ept d
raw
ing,
not
an
engi
neer
ed d
raw
ing.
It is
not
inte
nded
to
desc
ribe
a co
mpl
ete
syst
em,
nor
any
part
icul
ar s
yste
m.
It is
up
to t
he s
yste
m
desi
gner
to
dete
rmin
e th
e ne
cess
ary
com
pone
nts
for
and
conf
igur
atio
n of
the
pa
rtic
ular
sys
tem
bei
ng d
esig
ned,
inc
ludi
ng a
dditi
onal
equ
ipm
ent,
isol
atio
n re
lays
(fo
r lo
ads
grea
ter
than
the
con
trol’s
spe
cifie
d ou
tput
rat
ings
), an
d an
y sa
fety
dev
ices
whi
ch in
the
judg
emen
t of t
he d
esig
ner
are
appr
opria
te, i
n or
der
to p
rope
rly s
ize,
con
figur
e an
d de
sign
tha
t sy
stem
and
to
ensu
re c
ompl
ianc
e w
ith b
uild
ing
and
safe
ty c
ode
requ
irem
ents
.te
kmar
Con
trol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontro
l Sys
tem
s, In
c., U
.S.A
.; w
ww
.tekm
arco
ntro
ls.c
omH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad,
Ver
non,
B.C
. Can
ada,
V1B
3K
4; (2
50) 5
45-7
749
Fax
(250
) 545
-065
0
- App
licat
ion
Mec
hani
cal
P2
P1
MC
ombu
stio
nA
ir D
ampe
r (C
1)O
utdo
or S
enso
r(S
3) 0
70
115
V (a
c)24
V (a
c)
Cla
ss 2
Tran
sfor
mer
265
tekm
ar 5
00 s
erie
sth
erm
osta
ts
P3
Z1Z2
ΔP V1
Boi
ler R
etur
n S
enso
r(S
2) 0
71Boi
ler S
uppl
y S
enso
r(S
1) 0
71
A1
P4
DH
WTa
nk
A 2
65-4
07/1
0
A1 =
Aqu
asta
tC
1 =
Com
bust
ion
Air
Dam
per
P1
= B
oile
r Pum
p 1
P2
= B
oile
r Pum
p 2
P3
= S
yste
m P
ump
P4
= D
HW
Pum
pS
1 =
Boi
ler S
uppl
y S
enso
r 071
S2
= B
oile
r Ret
urn
Sen
sor 0
71S
3 =
Out
door
Sen
sor 0
70Z1
, Z2
= Z
one
Val
ves
Sys
tem
Ope
ratio
nTh
e B
oile
r Con
trol 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. T
he 2
65 p
rovi
des
mod
ulat
ion
to t
wo
mod
ulat
ing
boile
rs.
The
boile
rs a
re p
iped
in p
rimar
y-se
cond
ary
and
the
boile
r pu
mps
are
con
trolle
d by
the
265
to a
llow
for p
ost p
urgi
ng o
f the
boi
lers
afte
r the
y ha
ve s
hut o
ff. A
com
bust
ion
air d
ampe
r is
also
con
trolle
d by
th
e 26
5.
9 of 12 © 2010 A 265 - 07/10
Con
cept
Dra
win
gTh
is is
onl
y a
conc
ept d
raw
ing,
not
an
engi
neer
ed d
raw
ing.
It is
not
inte
nded
to
desc
ribe
a co
mpl
ete
syst
em,
nor
any
part
icul
ar s
yste
m.
It is
up
to t
he s
yste
m
desi
gner
to
dete
rmin
e th
e ne
cess
ary
com
pone
nts
for
and
conf
igur
atio
n of
the
pa
rtic
ular
sys
tem
bei
ng d
esig
ned,
inc
ludi
ng a
dditi
onal
equ
ipm
ent,
isol
atio
n re
lays
(fo
r lo
ads
grea
ter
than
the
con
trol’s
spe
cifie
d ou
tput
rat
ings
), an
d an
y sa
fety
dev
ices
whi
ch in
the
judg
emen
t of t
he d
esig
ner
are
appr
opria
te, i
n or
der
to p
rope
rly s
ize,
con
figur
e an
d de
sign
tha
t sy
stem
and
to
ensu
re c
ompl
ianc
e w
ith b
uild
ing
and
safe
ty c
ode
requ
irem
ents
.te
kmar
Con
trol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontro
l Sys
tem
s, In
c., U
.S.A
.; w
ww
.tekm
arco
ntro
ls.c
omH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad,
Ver
non,
B.C
. Can
ada,
V1B
3K
4; (2
50) 5
45-7
749
Fax
(250
) 545
-065
0
- App
licat
ion
Ele
ctri
cal
C24
V (a
c)R
N11
5 V
(ac)
Cla
ss 2
Tran
sfor
mer
L
Do
not a
pply
pow
er
1213
Com –
5A5A
5A5A
5A5A
5A5A
Boil
Sup
Boil
Ret
Out +
UnO
Sw+
–Pr
im P1Bo
ilDe
mCo
mDe
m
12
34
56
78
910
1114
1516
1718
1920
2122
2324
2526
2728
2930
Setp
/DH
W31M
od1
mA
+–
Mod
2 m
A+
–M
od3
mA
LN
Powe
r1
1Bo
iler
22
Boile
rC.
A./
Aler
tBo
iler 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
MZ2
M
MC
1A
1
R
tekm
ar 5
00 S
erie
sTh
erm
osta
ts
CRe
lay
1R
tekm
ar 5
00 S
erie
sTh
erm
osta
ts
CRe
lay
1
A 2
65-4
07/1
0
A1 =
Aqu
asta
tC
1 =
Com
bust
ion
Air
Dam
per
P1
= B
oile
r Pum
p 1
P2
= B
oile
r Pum
p 2
P3
= S
yste
m P
ump
P4
= D
HW
Pum
pS
1 =
Boi
ler S
uppl
y S
enso
r 071
S2
= B
oile
r Ret
urn
Sen
sor 0
71S
3 =
Out
door
Sen
sor 0
70V
1 =
Pre
ssur
e D
iffer
entia
l Byp
ass
Val
veZ1
, Z2
= Z
one
Val
ves
Ess
entia
l Con
trol
Set
tings
Boi
l 3 =
OFF
DH
W M
OD
E =
1 (n
o pr
iorit
y)
2 (p
riorit
y)St
and
Alon
e
Adva
nced
Exte
rnal
Inpu
t
OffC.
A.OffAl
ert
Fixe
d Le
adFi
rst O
n / L
ast O
ff
Firs
t On
/ Firs
t Off
Soft
Stop
Rota
tePa
ralle
l
Insta
ller
Exer
cise
Sequ
entia
l
requ
ired
optio
nal
© 2010 A 265 - 07/10 10 of 12
Con
cept
Dra
win
gTh
is is
onl
y a
conc
ept d
raw
ing,
not
an
engi
neer
ed d
raw
ing.
It is
not
inte
nded
to
desc
ribe
a co
mpl
ete
syst
em,
nor
any
part
icul
ar s
yste
m.
It is
up
to t
he s
yste
m
desi
gner
to
dete
rmin
e th
e ne
cess
ary
com
pone
nts
for
and
conf
igur
atio
n of
the
pa
rtic
ular
sys
tem
bei
ng d
esig
ned,
inc
ludi
ng a
dditi
onal
equ
ipm
ent,
isol
atio
n re
lays
(fo
r lo
ads
grea
ter
than
the
con
trol’s
spe
cifie
d ou
tput
rat
ings
), an
d an
y sa
fety
dev
ices
whi
ch in
the
judg
emen
t of t
he d
esig
ner
are
appr
opria
te, i
n or
der
to p
rope
rly s
ize,
con
figur
e an
d de
sign
tha
t sy
stem
and
to
ensu
re c
ompl
ianc
e w
ith b
uild
ing
and
safe
ty c
ode
requ
irem
ents
.te
kmar
Con
trol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontro
l Sys
tem
s, In
c., U
.S.A
.; w
ww
.tekm
arco
ntro
ls.c
omH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad,
Ver
non,
B.C
. Can
ada,
V1B
3K
4; (2
50) 5
45-7
749
Fax
(250
) 545
-065
0
- App
licat
ion
Mec
hani
cal
P2
P1
MC
ombu
stio
nA
ir D
ampe
r (C
1)O
utdo
or S
enso
r(S
3) 0
70
115
V (a
c)24
V (a
c)
Cla
ss 2
Tran
sfor
mer
265
tekm
ar 5
00 s
erie
sth
erm
osta
ts
P3
P5
P6
Boi
ler R
etur
n S
enso
r(S
2) 0
71Boi
ler S
uppl
y S
enso
r(S
1) 0
71
A1
P4
DH
WTa
nk
R3
R2
R1
A 2
65-5
07/1
0
A1 =
Aqu
asta
tC
1 =
Com
bust
ion
Air
Dam
per
P1
= B
oile
r Pum
p 1
P2
= B
oile
r Pum
p 2
P3
= S
yste
m P
ump
P4
= D
HW
Pum
pP
5, P
6 =
Zon
e P
umps
R1
= R
elay
004
R2,
R3
= R
elay
003
S1
= B
oile
r Sup
ply
Sen
sor 0
71S
2 =
Boi
ler R
etur
n S
enso
r 071
S3
= O
utdo
or S
enso
r 070
Sys
tem
Ope
ratio
nTh
e B
oile
r Con
trol 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
ontro
lled
by th
e 26
5 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
om-
bust
ion
air d
ampe
r is
also
con
trolle
d by
the
265.
The
dom
estic
hot
wat
er ta
nk is
pip
ed in
prim
ary-
seco
ndar
y an
d ha
s an
ex
tern
al re
lay
to p
rovi
de p
riorit
y ov
er th
e sp
ace
heat
ing.
11 of 12 © 2010 A 265 - 07/10
Con
cept
Dra
win
gTh
is is
onl
y a
conc
ept d
raw
ing,
not
an
engi
neer
ed d
raw
ing.
It is
not
inte
nded
to
desc
ribe
a co
mpl
ete
syst
em,
nor
any
part
icul
ar s
yste
m.
It is
up
to t
he s
yste
m
desi
gner
to
dete
rmin
e th
e ne
cess
ary
com
pone
nts
for
and
conf
igur
atio
n of
the
pa
rtic
ular
sys
tem
bei
ng d
esig
ned,
inc
ludi
ng a
dditi
onal
equ
ipm
ent,
isol
atio
n re
lays
(fo
r lo
ads
grea
ter
than
the
con
trol’s
spe
cifie
d ou
tput
rat
ings
), an
d an
y sa
fety
dev
ices
whi
ch in
the
judg
emen
t of t
he d
esig
ner
are
appr
opria
te, i
n or
der
to p
rope
rly s
ize,
con
figur
e an
d de
sign
tha
t sy
stem
and
to
ensu
re c
ompl
ianc
e w
ith b
uild
ing
and
safe
ty c
ode
requ
irem
ents
.te
kmar
Con
trol S
yste
ms
Ltd.
, Can
ada;
tekm
ar C
ontro
l Sys
tem
s, In
c., U
.S.A
.; w
ww
.tekm
arco
ntro
ls.c
omH
ead
Off
ice:
510
0 S
ilver
Sta
r R
oad,
Ver
non,
B.C
. Can
ada,
V1B
3K
4; (2
50) 5
45-7
749
Fax
(250
) 545
-065
0
- App
licat
ion
Ele
ctri
cal
Ess
entia
l Con
trol
Set
tings
Boi
l 3 =
OFF
DH
W M
OD
E =
4
C24
V (a
c)R
N11
5 V
(ac)
Cla
ss 2
Tran
sfor
mer
L
Do
not a
pply
pow
er
1213
Com –
5A5A
5A5A
5A5A
5A5A
Boil
Sup
Boil
Ret
Out +
UnO
Sw+
–Pr
im P1Bo
ilDe
mCo
mDe
m
12
34
56
78
910
1114
1516
1718
1920
2122
2324
2526
2728
2930
Setp
/DH
W31M
od1
mA
+–
Mod
2 m
A+
–M
od3
mA
LN
Powe
r1
1Bo
iler
22
Boile
rC.
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p 1
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mp
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r#2
S1 S2 S
3
P3
P4
P1
P2
P6
P5
R1
R2
R3
MC
1A
1
7 8 1 2
6 5 4 3
7 8 1 2
6 5 4 3
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265
A 2
65-5
07/1
0
A1 =
Aqu
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1 =
Com
bust
ion
Air
Dam
per
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r Pum
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r Pum
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ump
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HW
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6 =
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umps
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= R
elay
004
R2,
R3
= R
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S1
= B
oile
r Sup
ply
Sen
sor 0
71S
2 =
Boi
ler R
etur
n S
enso
r 071
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= O
utdo
or S
enso
r 070
Stan
d Al
one
Adva
nced
Exte
rnal
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t
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A.OffAl
ert
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d Le
adFi
rst O
n / L
ast O
ff
Firs
t On
/ Firs
t Off
Soft
Stop
Rota
tePa
ralle
l
Insta
ller
Exer
cise
Sequ
entia
l
requ
ired
optio
nal
Product design, software and literature are Copyright © 2010 by:tekmar Control Systems Ltd. and tekmar Control Systems, Inc.
All specifications are subject to change without notice.Printed in Canada. A 265 - 07/10. 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, ΔT.
• 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 alert 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.
