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

    Oct 20, 2008, 04:08 PM
    baystat 240 to a honeywell rth7500d
    Hi I just purchased a Honeywell rth7500d for my home. I currently have a baystat 240 with a Trane heat pump with strip back up. I have tried to trace the wires and figure witch one goes to the new thermostat but with no luck. My baystat has r t o g y x2 b u w. I drew a diagram of the old wires and marked witch color went where. The Honeywell has c g y o/b rc r w2 e2 l. Can anyone help me figure out witch goes where? Thanks for any help
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #2

    Oct 20, 2008, 07:42 PM
    Quote Originally Posted by mrtims View Post
    Hi I just purchased a Honeywell rth7500d for my home. I currently have a baystat 240 with a Trane heat pump with strip back up. i have tried to trace the wires and figure witch one goes to the new thermostat but with no luck. My baystat has r t o g y x2 b u w. I drew a diagram of the old wires and marked witch color went where. The Honeywell has c g y o/b rc r w2 e2 l. Can anyone help me figure out witch goes where? Thanks for any help

    Here is a old wiring changeover chart that might help.

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