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    STAN123's Avatar
    STAN123 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Feb 22, 2008, 07:19 PM
    HONEYWELL RTH4300B but only an R and a C wire
    The back of the thermostat has W,Y,G,O,Rc,R,B not used, slots on the back. My old thermostat only has two wires labelled R and another labelled C.
    There is no wiring instructions for two wires, I have a furnace that heats water.
    Can you advise on where these wires go?
    Thanks
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Feb 22, 2008, 07:28 PM
    You just need a simple two wire thermostat the one you have is for a a/c and heat system. These types require different wiring and generally need a constant power wire which you may not have.
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