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

    Dec 13, 2008, 06:02 PM
    Thermostat wiring
    I have an old (1960's) oil fired, hot water baseboard heating system. I would like to install a honeywell rth221b digital thermostat. There are two wires (white & black)coming out of the wall, no labels on old thermostat and furnace only has "T" marked by each wire. Of the 5 possible hook-ups on the new thermostat labeled "Y,G,Rh,Rc,W" - which two are likely candidates? I have already been to "yourhome.honeywell.com"... no help.:confused:
    hixton's Avatar
    hixton Posts: 146, Reputation: 5
    Junior Member
    		  
    #2

    Dec 13, 2008, 06:07 PM

    Rh and W
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