Colorism: No Y Wire On Furnace

Thursday, October 13, 2022

No Y Wire On Furnace

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If there's no y then you just wire the y from the stat to one side of the condenser contactor and common for the other side. G will be powered on a call for cooling so the fan will come on. Are you sure the screw just aren't missing from the terminal block? On heat pump models, the y terminal in combination with the o terminal would be used to energize the compressor, track time between defrost cycles, and control the reversing valve to select between heat and cool.

All of its functions happen outside. You should have two wires. One wire goes to the thermostat *y* terminal. (if you have a yellow wire from the stat, connect either wire to that yellow wire) the other wire goes to the common side of the transformer. You can also run it to the chassis ground easy~~~simple Most hvac low voltage wire are color designated ie. Red is r, yellow is y and so on. The 'c' is common, which most techs nowadays use blue, on older trane models, the letter can be 'x' and the color wire csn be black. On your furnace, hook your blue thermostat wire to the c terminal and also at your the.