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Thread: Lennox Mini-Split Wired Thermostat Conversion to NEST

  1. #1
    Junior Member

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    Lennox Mini-Split Wired Thermostat Conversion to NEST

    There's a shielded 5-wire cable that plugs into the Lennox thermostat that controls our mini split heat-pump.

    It has 5 wires, labelled A (Brown), B (Red), C (Yellow), D (Black), E (White)... here's a wiring diagram.

    Can I open up the cable/separate the wires and swap in a Nest thermostat?

    Thanks for any and all help!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. #2
    Senior Member

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    No, that is not compatible with Nest or any other standard thermostat. Contact Lennox as they may have an adapter to provide the connections for a standard RWCYG thermostat.


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