Furnace Common Wire
#1
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Furnace Common Wire
The old circuit board for my furnace had a relay that was sticking so I got a new board that doesn’t have a ‘C’ connector (my old board did have a common wire hookup right on the board). The new board works fine but I’d like a C line to wire to my thermostat (my thermostat is cycling my furnace fan off/on and causing the furnace to click and not turn on the heat). Where can I connect a common wire to this new board? The board model number is B1809913.
Can I draw from the transformer?
Or is there a spot on the board? Or does this board not support a common wire? According to this diagram for my board:
http://www.icmcontrols.com/ProdImages/ig_LII318-2.pdf
the molex connector in the middle has a C connector, can I somehow draw from that connector?
Can I draw from the transformer?
Or is there a spot on the board? Or does this board not support a common wire? According to this diagram for my board:
http://www.icmcontrols.com/ProdImages/ig_LII318-2.pdf
the molex connector in the middle has a C connector, can I somehow draw from that connector?
#2
Welcome to the forums.
Many Goodmans, yours included, ground one side of the secondary of the transformer to ground and that is the Common connection.
Many Goodmans, yours included, ground one side of the secondary of the transformer to ground and that is the Common connection.
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Great, thank-you! So I can connect to that ground to the 'C' in my thermostat and it will provide a constant 24V for power? And I can test the voltage with a multimeter from C to R? I appreciate the help.
#4
And I can test the voltage with a multimeter from C to R?