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    gcfd13campbell's Avatar
    gcfd13campbell Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 24, 2009, 01:24 PM
    Wire colors different than Honeywell rth221
    I have a thermostat that has labels, not letters eg: 7.5, heat, cool, fan etc. The wires going to the thermostat are not your standard colors. I know what each of my wires are for, but I need to know what the letters represent on the back of my new Honeywell rth221. I know G means green, but what part of the system is it for? I need to know this for each of the letters.

    Thanks everyone.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 24, 2009, 01:41 PM
    G blower activation
    R power
    W heat
    Y cooling
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
    Uber Member
    		  
    #3

    Oct 24, 2009, 01:44 PM

    If able to , I would open Air Handler and check what the Letters corespond too.
    Red is common from transformer, Mostly I see White for Heat, Green for Blower Fan, Blue for Cool, or Yellow.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
    Uber Member
    		  
    #4

    Oct 24, 2009, 01:45 PM
    I see I'm a slow typest.
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