W (White): Attach to the W terminal for the heating stage. It is often used with an ODT (Outdoor Defrost) terminal.
Trane Thermostat Wiring Sequence Heat Mode
R (Red): Attach to the R terminal for 24V power. The sequence ensures the system can switch modes without conflict.
B Reversing Valve (Auxiliary) On a heat pump, this terminal controls the reversing valve to heat. The following wiring is considered the industry standard for a basic configuration.
Trane Thermostat Wiring Sequence Heat Mode
While configurations can vary slightly, the following labels are the most common in the field. C Common Return path for the 24V power; often connected to the W terminal bridge on the transformer.
More About Trane thermostat wiring heat pump
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