Everything You Need to Know About Wiring Diagram - SmartDraw
| Wire Color | Standard Function | Lennox Specific Use | | :--- | :--- | :--- | | | R – 24V power | Same; often on terminal 1 of transformer | | White | W – Heat | Can also be W1 or W2 | | Yellow | Y – Compressor | Y1 for outdoor unit contactor | | Green | G – Fan | Indoor blower relay | | Blue/Black | C – Common | Critical for smart thermostats | | Orange | O – Reversing valve | Lennox heat pumps (cooling-energized) | | Brown | C/External | Sometimes used for outdoor sensor | | Purple | Not standard | Used on Lennox ECM motors for 24V speed taps | Lennox Wiring Diagram
Enter your full model number (e.g., Lennox G50UH-48C-110-06 ) into: Everything You Need to Know About Wiring Diagram
A Lennox wiring diagram is a visual representation of the electrical connections within a Lennox HVAC system. It's a detailed map that shows how the various components, such as thermostats, sensors, and control boards, are connected and interact with each other. These diagrams are essential for troubleshooting, installing, and repairing Lennox HVAC systems. such as thermostats