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

    Feb 19, 2009, 10:33 AM
    8 wire to 5 wire Thermostat swap
    I want to go from this Sears Weathertron :




    To this Emerson Model 7903:


    Is this possible?
    and if it is can someone point out where the wires go from the old to the new?

    here's what I'm thinking:
    R should go to:do not use
    T should go to: do not use
    O should go to: Rh-Rc jumped
    G should go to: G
    Y should go to: Y
    X2 should go to: do not use
    B should go to: do not use
    W should go to: W

    Probably got it all wrong, Probably not even compatible thermostats, I've already called any/everyone I can without paying for it, no info available. Let the flames begin... ;0)
    kycpl's Avatar
    kycpl Posts: 2, Reputation: 1
    New Member
    		  
    #2

    Feb 19, 2009, 10:34 AM

    Yeah yeah I'm going to check the inside and outside model numbers now... sheesh
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Feb 19, 2009, 02:06 PM
    They are not compatible. Sorry.
    EPMiller's Avatar
    EPMiller Posts: 624, Reputation: 37
    Senior Member
    		  
    #4

    Feb 19, 2009, 02:19 PM

    It appears that you have a heat pump. The Emerson does NOT have the capability to control the reversing valve and the emergency (most likely electric) heat.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #5

    Feb 19, 2009, 02:33 PM
    Of course, if you REALLY want that thermostat, replace your system with something that will be compatible. What! This is America! You can if you want... :rolleyes:
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