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    dnock70's Avatar
    dnock70 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 23, 2007, 11:50 AM
    Honeywell rth6300b installation
    I purchase the Honeyell rth6300b thermostat. I have eight wires coming from my old mercurury switched labelled as follows...
    o
    Y
    X2
    B
    W
    R
    T
    G

    The honeywell has G, W ,Y, R, Rc inputs on the back. R and Rc are connected by a jumper. I am able to attach G, W, Y, R to the new thermostat. That leaves O, X2, B,T left. Can someone tell me if these are dead, or if I have to connect these? If so, I may not be able to use this honeywell in my home. My current set up is a heating unit, and ac unit that are connected to the old mercury system.

    Regards,

    David
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 23, 2007, 12:43 PM
    If you have a heat pump with two stage heat this stat will not work. IE heat pump with electric heat is a two stage heat system.

    Read this. It also came with the thermostat. READ page 6

    http://customer.honeywell.com/techli...0s/69-1717.pdf
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