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  1. #1
    Join Date
    Jan 2013
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    Help to identify wiring in old thermostat


    We just bought a house.
    This house has a fairly old dual fuel heating/cooling system (york heat pump and oil furnace) with a york thermostat using mercury.
    I attached the picture of the thermostat without the cover.
    I'd like to change it for a Nest learning thermostat and sent the picture to Nest support.
    From the picture I have attached, they are unable to determine if your system is compatible.
    I need to remove the thermostat from the wall to expose the wire terminals. I really don't want to do this since I don't want to break anything.

    Is there somebody on this forum that could give me some info regarding my thermostat; serial number, serie or even better wiring schematics ?

    Thanks a lot in advance

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