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

    Nov 11, 2008, 10:58 AM
    Wire connection on Honeywell Thermostats
    The house had a two-zone heat system, with two non-programmable thermostats (Mercury based ones). I'm trying to replace them with Honeywell Programmable thermostat Model# RTH221B. However when I opened the old Mercury based thermostat(Robershaw) there are only 2 wires a White and a Black wire. The new Honeywell Thermostat has 5 wire ports, Y, G on left side and Rh, Rc & W on right side. Honeywell instalation mannel says nothing about a black wire so unsure where to connect the Black wire on the new Honeywell thermostat.
    I tried to seek advice in the store, but no luck.
    Grateful for any guidance.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Nov 11, 2008, 02:05 PM
    Try RH/black and W/white on the new stat. Make sure the batterys are good. Hope it works.
    qbforeva's Avatar
    qbforeva Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Nov 18, 2008, 05:35 AM

    Thank You hvac1000... its worked
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Nov 18, 2008, 06:16 AM
    Glad you got it working.
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