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    criqui's Avatar
    criqui Posts: 2, Reputation: 1
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    #1

    Jul 10, 2010, 07:29 PM
    Replacing Honeywell LR69071 thermostat with Honeywell TH8320U1008
    I thought the transfer of wiring would be intuitive, but I was clearly mistaken. I have a heat pump with an aux electric furnace. Current connections are (by color)
    X - blue
    W2 - white
    R - red
    G- green
    O - orange
    Y - yellow
    E - brown

    Can anyone tell me where these should connect on the TH8320? Some seem obvious, but not all.

    Pete Criqui
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #2

    Jul 10, 2010, 08:33 PM

    all wires should go to the same place except x may be L and white will go to aux
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #3

    Jul 10, 2010, 08:55 PM

    X may be common or emergency heat relay (suspect common)

    Thermostat signals and wiring - Transwiki

    The 8320 is quite a complex thermostat. I'd have to chase down both manuals.

    E will be Aux heat
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #4

    Jul 11, 2010, 09:03 AM

    Never before have I seen x used as a common, X and L are used as a power to send the fault code to the t-stat from the defrost control. E is the emergency heat relay that has a wire on it. When used as a heatpump the 8000 t-stat has a termanal for w that says aux. somewhere on the stat has to be a C for the common wire. Also it is important you do the right installer setup for this stat or it will not work.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #5

    Jul 11, 2010, 10:23 AM

    My reference:

    Thermostat signals and wiring - Transwiki
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