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P/N HN-IOM-1 82-0331 Copyright 2009 Mestek, Inc.
Finned copper tube gas boilers & water heaters – Control manual
Wiring
(continued)
6
Primary/secondary piping — component electrical connections
Figure 6
Component electrical connections
Combustion air damper proving switch
1.
Combustion air damper motor enable
2.
DHW tank sensor (when used in lieu of DHW
3.
aquastat)
DHW tank aquastat (when used in lieu of DHW
4.
sensor)
Outdoor air temperature sensor
5.
Local flow proving switch
6.
System/header temperature sensor
7.
Local pump enable
8.
System pump enable
9.
DHW pump enable
10.
Return temperature sensor
11.
Supply temperature sensor
12.
System flow proving switch
13.
PUMPS REQUIRE RELAYS OR STARTERS
— DO NOT
directly operate a pump using the
HeatNet contacts. Use these contacts only to
operate pump relay or starter coils.
