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    Johnny24's Avatar
    Johnny24 Posts: 3, Reputation: 1
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    #1

    Nov 13, 2008, 06:36 PM
    Wiring diagram change from Addison Thermostat to a Honeywell
    Can someone answer what the w3 wire would need to be hook to on the new Honeywell RTH7400 5-1-1. we are removing a addison thermostat which runs a Gas furnace and a heatpump. Please help with wiring diagram
    MarkwithaK's Avatar
    MarkwithaK Posts: 955, Reputation: 107
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    #2

    Nov 13, 2008, 07:17 PM

    Have you read the installers guide that came with your stat?
    Johnny24's Avatar
    Johnny24 Posts: 3, Reputation: 1
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    #3

    Nov 13, 2008, 07:27 PM
    Yes we have read it there is No mention of a w3 wire and what it connects to
    MarkwithaK's Avatar
    MarkwithaK Posts: 955, Reputation: 107
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    #4

    Nov 13, 2008, 07:32 PM

    What is it attached to on your furnace?
    Johnny24's Avatar
    Johnny24 Posts: 3, Reputation: 1
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    #5

    Nov 13, 2008, 07:39 PM
    Not sure I will try to trace it back tomorrow and get back to you.
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