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Wiring Example for Thermostat for a single stage heat pump with aux backup emergency heat * one stage heat* one stage cool* backup emergency heat C = common = black wire Rc and R = cooling power, heating power = red wire O/B = Change over valve aka reverse valve = orange wire Y = compressor stage 1 = yellow wire G = fan relay = green wire AUX-E = Backup Heat/ Emergency Heat = white wire Additional: S1 = outdoor sensor = gray S1 = outdoor sensor = pink