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No y connection on furnace module to connect a.c. This is on a goodman model gmp075-3 furnace. I bought the b18099-13 replacement module and still no y terminal. I dont know were to land the t-stat wiring. please help

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"Y" terminal at the stat feeds condensing unit outside, common from the condensing unit to common on the furnace transformer.
"G" terminal on the stat brings the fan on for air circulation. In cooling mode "Y" terminal also brings the fan on. If this furnace was not A/C ready check the VA capacity of the transformer. Should be about 40VA. Make sure there is a fan relay to bring the fan on in the cooling mode.

Posted on May 01, 2008

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