


In the case of the thermostat calling for cooling the thermostat switches on the power from the “R” or in some cases the “RC” terminal which is the 24 volt power source to the “Y” terminal on the thermostat which is in essence the call for cooling. These terminals are located on the back or on the wall mounted face plate of the thermostat.
The second set of wires going to the outdoor unit also connect to the "Y" and "C" terminals in the furnace and then they either connect to another terminal or simply to wires inside the outdoor unit. The same 24 volt power applied to the Y terminal at the furnace also tells the air conditioner to run
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