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    Bretski's Avatar
    Bretski Posts: 2, Reputation: 1
    New Member

    Aug 6, 2010, 09:52 AM
    How do I hook up a honeywell T87F thermostat the 5 wires from wall bl rd yel what grn?
    Just a quick question.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
    Ultra Member

    Aug 6, 2010, 10:21 AM

    Do you know what each wire is hooked to on the old thermostat?

    Perhaps this will help
    Bretski's Avatar
    Bretski Posts: 2, Reputation: 1
    New Member

    Aug 6, 2010, 11:06 AM
    Comment on wmproop's post
    All but the blue wire was hooked up. So we have 4 wires to try & put into 3 places. We have the manual for the new one but still don't know what 3 wires to choose. Thanks for trying.
    kryostar's Avatar
    kryostar Posts: 108, Reputation: 11
    Junior Member

    Aug 6, 2010, 10:53 PM
    The most common color code would be (red-R 24v power) (yellow-Y compressor a/c) (green-G indoor blower) (white-W heat) (black-C common) hope you can use this !

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