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    MikeR1983's Avatar
    MikeR1983 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Feb 9, 2011, 01:37 PM
    How to hook up a three wire thermostat?
    I have the old round honeywell thermostat with three wires white,green,red and now I want to hook up my new thermostat which is a honeywell rth230b thermostat. But I do not know which wire goes where because on the old thermostat the white is hooked to the y which is easy to figure out where that one goes but the green is hooked to a 4 terminal and the red is hooked to a 5 terminal. On my new thermostat is a Rh-Rc-W-Y-G so where do they go. If anyone can tell me that would great I'm in Minnesota and it's cold here. Thanks
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Feb 9, 2011, 03:39 PM
    R--red
    W to white
    Is all you really need
    But you can tie the green to G, if you like
    MikeR1983's Avatar
    MikeR1983 Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Feb 11, 2011, 07:15 AM
    Comment on wmproop's post
    Hey thanks a lot that worked
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