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    momi7676's Avatar
    momi7676 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 11, 2009, 06:21 PM
    Honeywell rth221b
    "im replacing the old thermostat wich have only 2 wires red and white and no other marking.where do I plag the wires with my new honeywell thermostat RTH221B WICH HAVE 5 option for connection?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 11, 2009, 06:35 PM
    Use W=White and R (it might be marked RH)=Red this is for heat only
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