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

    Nov 16, 2011, 11:19 PM
    Replacing an old thermostat from the 1970s, but it only has 2 wires, how do I wire it
    There's one black and one white wire, where do I put into new thermostat g,w,y,r or rc?
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Nov 17, 2011, 08:53 AM
    Put one on R post,, the other on W post,, doesn`t matter which color
    repairman_red's Avatar
    repairman_red Posts: 37, Reputation: 1
    Junior Member
    		  
    #3

    Nov 21, 2011, 06:37 AM
    If you want to fully utilize the new thermostat then you need new wire; elsewise, hook one to r and the other to w.
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