Heating Cooling Units

Installeing Honeywell thermostat RTH110B?

I bought a Honeywell thermostat RTH110B. It has entries Rh, Rc, W, Y, G. The son leaving the wall are Red, White, Yellow and Blue. How do I know which wire goes where? The control unit is an electric heater / cooler (AC). Manufacturer: First Co. Model No: 18HXHPO-240 Thanks, Arman

Normally red goes to the RS and RC (use a jumper) white to W (for heat) Yellow to Y (for cooling) and Blue is normally used for a common approach, but I suspect it was used for the fan so he puts on the terminal G.

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