There are several types of Lennox wiring diagrams, including:
| 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
Here are some frequently asked questions about Lennox wiring diagrams: There are several types of Lennox wiring diagrams,