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    saram1978's Avatar
    saram1978 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Jul 10, 2008, 11:29 AM
    4 wire thermostat
    I am installing a new thermostat to a 4 wire connection and have no clue where they go, I have a red, white, blue and green wire.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
    Uber Member
    		  
    #2

    Jul 10, 2008, 11:36 AM
    Red is probably from transformer, white may be heat, blue to compressor contactor coil for cool, and green for the blower fan.
    Try red to r, white to w, green to g and blue to(verify with instructions) b? Or Y?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Jul 10, 2008, 11:37 AM
    Read the install instructions that came with the thermostat?

    Brand and EXACT model number of the stat you are trying to wire?
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