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Trane XR401 Wiring Diagram and Installation Guide
"To install or wire a Trane XR401 thermostat (often identified as the TAYSTAT401), connect the 24VAC wires to their corresponding terminals: R for power, W for heating, Y for cooling, and G for the fan. For heat pump systems, the O or B terminal controls the reversing valve. Always disconnect the HVAC system power at the breaker before beginning the installation to prevent blowing the low-voltage fuse or damaging the transformer. Understanding the Trane XR401 Thermostat System As of 2026, the Trane XR401 remains a staple in many residential HVAC systems due to its reliability and straightforward interface. Known technically as the TAYSTAT401,..."
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