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

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his

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ed to

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scrib

e a

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plet

e sy

stem

, no

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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

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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

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perly

siz

e, c

onfig

ure

and

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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

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yste

ms

Ltd.

, Can

ada;

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ar C

ontr

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yste

ms,

Inc.

, U.S

.A.;

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arco

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ead

Off

ice:

510

0 S

ilver

Sta

r R

oad

, Ver

no

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.C. C

anad

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0) 5

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0) 5

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- 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

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ot in

tend

ed to

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scrib

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plet

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stem

, no

r an

y pa

rtic

ular

sys

tem

. It

is u

p to

the

sys

tem

de

sign

er t

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term

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the

nece

ssar

y co

mpo

nent

s fo

r an

d co

nfig

urat

ion

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he

part

icul

ar s

yste

m b

eing

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igne

d, i

nclu

ding

add

ition

al e

quip

men

t, is

olat

ion

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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

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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

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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

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win

g. It

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tend

ed to

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scrib

e a

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plet

e sy

stem

, no

r an

y pa

rtic

ular

sys

tem

. It

is u

p to

the

sys

tem

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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

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igne

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ition

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men

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eate

r th

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he c

ontr

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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;

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ar C

ontr

ol S

yste

ms,

Inc.

, U.S

.A.;

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w.t

ekm

arco

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ice:

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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

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3) 0

70

150

115

V (

ac)

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(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:

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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

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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

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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

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MZ

2

M

MC

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1

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ar 5

00 S

erie

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erm

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ts

CR

elay

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ar 5

00 S

erie

sTh

erm

osta

ts

CR

elay

1

A 2

65-4

10/0

3

A1

= A

quas

tat

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= 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

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ar 5

00 s

erie

sth

erm

osta

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ler

Ret

urn

Sen

sor

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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

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p 1

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= B

oile

r P

ump

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3 =

Sys

tem

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pP

4 =

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ump

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= Z

one

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psR

1 =

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ay 0

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2, R

3 =

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ay 0

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1 =

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ler

Sup

ply

Sen

sor

071

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= B

oile

r R

etur

n S

enso

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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

bui

ldin

g an

d sa

fety

cod

e re

quire

men

ts.

tekm

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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.