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Goodman GPM075-3 air conditioning connections

Goodman GPM075-3. I need to know where the two wires from the outside compressor hook up on the board. The blue wire from the tstat (which controls the cooling) should connect with one of them. Where should these wires connect?

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Your thermostat powers 'Y' for cooling. That in your case blue wire connects to 'Y' on the control board in the furnace. Then a pair of low-voltage wires connects 'Y' and 'C' on the furnace to the two wires to the coil of the contactor in the a/c condensing unit. So to follow the path, the signal wire from the thermostat sends 24v down the Y wire to the furnace board Y terminal which also connects to one side of the contactor coil in the air conditioner. To complete the control circuit to the air conditioner there has to be a common wire. This is connecting the C wire from the furnace board to the other side of the contactor in the air conditioner. Hope this helps.

Posted on Dec 11, 2009


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ok Let me see if this helps if not please comment back with the t-stat model and make as well. The Y terminal on the t-stat needs to be connected to the Y terminal on the heat pump board. If this does'nt fix it your thermostat may have something different going on so please send me the model and make of the t-stat. Also if you know does this unit have outside temperature sensing probes, and or an automatic defrost cycle?

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