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    Laurieretired's Avatar
    Laurieretired Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 25, 2007, 02:55 PM
    Heating and airconditioning
    I have a high efficiency gas furnace along with a heat pump/air conditioner.
    I want to change my old Honeywell Chronotherm 111, programmable thermostat with a new Honeywell Proo TH6220D model.
    The old one has seven wires the new calls for eight?
    Help!
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 26, 2007, 12:00 AM
    If you have to have 8 pull a additional wire.
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
    		  
    #3

    Oct 26, 2007, 05:53 AM
    Your system only needs 7 wires. The new thermostat shouldn't need more unless it requires a common one for power that the old didn't. If so, you might return it for one that doesn't. There is a great explanation of thermostat wires at https://www.askmehelpdesk.com/heatin...ons-58313.html

    If your furnace is in an unfinished basement, pulling a wire may not be that big of a project.
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