W Heating Controls the furnace or heating stage; closes to call for heat. Core Terminal Definitions Terminal Function Description R Power 24V transformer hot; provides power to the thermostat circuitry.
Enabling Cooling Mode on Trane Thermostat Heat Pump Wiring
B Reversing Valve (Auxiliary) On a heat pump, this terminal controls the reversing valve to heat. W (White): Attach to the W terminal for the heating stage.
Y (Yellow): Attach to the Y terminal for the cooling stage. Proper Trane thermostat wiring for a heat pump setup is the backbone of efficient year-round climate control.
Enabling Cooling Mode on Trane Thermostat Wiring for Heat Pumps
E Emergency Heat Triggers the backup electric heat strips. Y Cooling Controls the outdoor condenser; closes to call for cooling.
More About Trane thermostat wiring heat pump
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