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    jplowman's Avatar
    jplowman Posts: 1, Reputation: 1
    New Member

    Dec 9, 2013, 04:43 PM
    Replace Weathertron thermostat with Honeywell RTH3100C
    I am replacing my Weathertron BAY28x138A thermostat with a Honeywell RTH 3100C thermostat. It is on a Trane XL1200 Heat Pump with Aux. and Emerg. Heat. The terminals and colors of wire are as follows on the Weathertron:

    U-Jumper to W

    The terminals on the Honeywell RTH3100C are as follows:
    E, Aux, Y, G, O, L, R, B, C.

    I could use help in determining which wire to hook to what and as near as I can tell the T-Brown is not used on the new thermostat.
    don45's Avatar
    don45 Posts: 1, Reputation: 1
    New Member

    Dec 9, 2018, 07:54 PM
    Did you ever get an answer for this? I have reposted the question.


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