Color Code For Thermostat

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Can't figure this 3 wire system out or find anything in postal about it

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Can't figure this 3 wire system out or find anything in postal about it

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Thermostat Wires Explained

Wire A Thermostat

Thermostat Wiring Color Code [Decoded and Explained] - YouTube

Thermostat Wiring to a Furnace and AC Unit! Color Code, How it Works