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- Application
Boiler Control 261
A 261-2
03/09
Copyright ©2009 A 261-2 03/09
Note: This is only a concept drawing. The designer must determine whether this application will work in his system and must ensure compliance with
code requirements. Necessary auxiliary equipment, isolation relays (for loads greater than the specified tekmar internal relay ratings), and other safety
and limit devices must be added.
Mechanical
Outdoor
Sensor (S2) 070
Boiler
Sensor
(S1) 082
Z1 Z2 Z3
T1 T2 T3
Class 2
Transformer
120 V (ac)
24 V (ac)
261
R1 R2 R3
Electrical
R1, ..., R3 = Relay 003
S1 = Boiler Sensor 082
S2 = Outdoor Sensor 070
T1, ..., T3 = Thermostats
U1 = tekmar Timer 033 (optional)
Z1, ..., Z3 = Zone Pumps
S1
S2
N
L
24 V (ac)
120 V (ac)
Class 2
Transformer
C
R
R1
R2
R3
Z1
Z2
Z3
T3
T2
T1
3
4
6
5
7
2
1
8
3
4
6
5
7
2
1
8
3
4
6
5
7
2
1
8
Boiler
#2
Boiler
#1
U1
261
12 4
6
8
10
5 9
Do not apply power
11 12 13 14 15
Sw
UnO
7
N
L
N
Power
1716
Com
Out
3
10A
Boiler
Demand
Setpoint
Demand
Boil
Pmp
Stage Stage
Boil
Com
10A 10A
1122
= Required
= Optional
Installer
Off
Rotate
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