Application Brochure

7 of 8
- Application
Boiler Control
A 261-4
03/09
Copyright ©2009 A 261-4 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
DHW
Tank
Outdoor
Sensor (S2) 070
P1
A1
A2
Boiler
Sensor
(S1) 082
R1
P
Class 2
Transformer
120 V (ac)
24 V (ac)
261
Electrical
A1 = DHW Aquastat
A2 = DHW High Limit Aquastat
P1 = DHW Pump
R1 = Relay 003
S1 = Boiler Sensor 082
S2 = Outdoor Sensor 070
24 V (ac)
120 V (ac)
Class 2
Transformer
N
L
C
R
S1
S2
A1
A2
P1
R1
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
3
4
6
5
7
2
1
8
Boiler
#1
Boiler
#2
= Required
= Optional
Installer
Off
Rotate
Advanced