Instruction manual

25
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 connectionsFigure 6
Component electrical connections
Combustion air damper proving switch1.
Combustion air damper motor enable2.
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 sensor5.
Local flow proving switch6.
System/header temperature sensor7.
Local pump enable8.
System pump enable9.
DHW pump enable10.
Return temperature sensor11.
Supply temperature sensor12.
System flow proving switch13.
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.