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    Rcole49's Avatar
    Rcole49 Posts: 3, Reputation: 1
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    #1

    Dec 6, 2008, 09:20 PM
    Ruud Thermostat with honeywell RTH7500
    The old RUUD thermonstat wiring has
    G R B
    Y
    W2
    X
    The honeywell Programmable has the following wiring.

    C AUX
    G E
    Y L
    O/B
    RC
    R

    I can not get the honeywell to do anything but run the fan in the manual mode. By the way the RC&R are bracket. I have tried the wiring that is in the manual but still have no luck. Do I have the right Programmable Thermostat
    Rcole49's Avatar
    Rcole49 Posts: 3, Reputation: 1
    New Member
    		  
    #2

    Dec 7, 2008, 06:00 PM
    To get the Honeywell thermostat to work correctly all I had to do was read and follow the instructions that came with the thermostat. :)
    RetroFit's Avatar
    RetroFit Posts: 16, Reputation: 1
    New Member
    		  
    #3

    Dec 14, 2008, 04:06 PM
    Quote Originally Posted by Rcole49 View Post
    The old RUUD thermonstat wiring has
    G R B
    Y
    W2
    X
    The honeywell Programmable has the folowing wiring.

    C AUX
    G E
    Y L
    O/B
    RC
    R

    I can not get the honeywell to do anything but run the fan in the manual mode. By the way the RC&R are bracket. I have tried the wiring that is in the manual but stil have no luck. Do I have the right Programmable Thermostat
    This is the same wire setup that I have but I've missed something... I don't know what to do with the old B and X wires. Can you tell me where yours went?
    Rcole49's Avatar
    Rcole49 Posts: 3, Reputation: 1
    New Member
    		  
    #4

    Dec 14, 2008, 05:14 PM

    The B wire goes to the O/B.
    The X wire goes to the E.

    I also follow the System setup instruction and the Thermostat and system is working OK.
    RetroFit's Avatar
    RetroFit Posts: 16, Reputation: 1
    New Member
    		  
    #5

    Dec 14, 2008, 06:42 PM
    Quote Originally Posted by Rcole49 View Post
    The B wire goes to the O/B.
    The X wire goes to the E.

    I also follow the System setup instruction and the Thermostat and system is working OK.
    I'll give that a try. I did have the B wire in the O/B but had the X in the C and a jumper from the aux to the E on the thermostat. It seemed to be working better but it is difficult to tell if it is appropriately using the heat pump vs the electric aux mode. I certainly don't want to have it be running the electric all the time.
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