Question about Heating & Cooling
You will have to trace the wires from the source, unfortunately, the colors may not be accurate. Do you have a 24v heat and cool system? I am going assume the answer of yes, as this is the most common. If you have something different, we will need to go over this again. According to the new thermostat, the red is the power, it will come from the low output side (24volt) of the transformer. Green is blower fan, it will go to a relay that turns the fan on when the thermostat is set from auto to on. The white is heat, this will go to the pilot/ gas valve etc. Last is yellow or blue, either color is for the cool. This goes to the control for the compressor, usually the contactor.
Posted on Jan 07, 2008
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Posted on Jan 02, 2017
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