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Thread: 3 wire mini volt to XL824

  1. #1
    Junior Member

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    Post 3 wire mini volt to XL824

    what is the proper wiring config for a 3 wire minivolt old school thermostat to use the new XL824 wifi thermostat?

    I get I need power so I purchased a 24-volt transformer and powered it using the common and the Heat side R terminal removing the jumper so power didn't bleed over to the switching circuit.

    IT isn't acting right. fan not going on even though the XL824 screen says it is.

    When I disconnect and use jumpers on the 3 wires it works fine.

    any suggestions?

    The 3 wire wiring is behind some really old paneling so I don't want to have to change out the wires.

    any direction would be greatly appreciated!

  2. #2
    Member

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    Thermostats usually get power from the Rc so leave the jumper in.

  3. #3
    Junior Member

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    Quote Originally Posted by Stuff View Post
    Thermostats usually get power from the Rc so leave the jumper in.
    Thanks.. I will try it


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