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    gmctruck's Avatar
    gmctruck Posts: 1, Reputation: 1
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    #1

    Dec 27, 2014, 02:33 PM
    My heating system is kind of strange
    My heating system is kind of strange. It's in a condo unit that was built in the 1970's. I have hydronic baseboard heat that is throughout the building, and an A/C unit in the ceiling. One thermostat controls it all. I want to put a new stat in. The old stat has wires going to G R W1 W2 the new stat has the normal wire slots B O G Y W R Rc. How do I wire the new stat in?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    Dec 27, 2014, 04:00 PM
    What model and brand is your new stat? It may not be correct for your unit.
    bitters's Avatar
    bitters Posts: 348, Reputation: 12
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    #3

    Dec 27, 2014, 04:25 PM
    Sound's like you bought a heat pump stat.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #4

    Dec 27, 2014, 04:29 PM
    Quite likely, here is a chart Thermostat Wire Colors Code | HVAC Control The orange wire is only used for a heat pump.
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #5

    Dec 28, 2014, 06:53 PM
    With no 'Y' terminal, I don't understand how the A/C operated. Any numbers on the old stat?
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