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

    Jul 25, 2009, 09:25 AM
    Honeywell RTH110B
    I just bought a Honeywell model # RTH110B to replace an old thermostat. My problem is, I have 5 wires (white, yellow, green, blue, and red). The honey well does not have a label for blue. Where does the blue wire go?
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Jul 25, 2009, 09:54 AM
    Does it have a spot labeled ,C, if not the blue isn`t necessary, the blue/common is to take away the need for a battery

    This is in normal cases providing the wireing was done by rule of thumb
    djevica's Avatar
    djevica Posts: 3, Reputation: 1
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    #3

    Jul 25, 2009, 11:29 AM
    The only "C" it has is next to the R. Rc and Rh. If the Blue goes with the Rc, then I don't need the wire linking Rh and Rc? Says I don't need it for a 5 wire hook up.
    djevica's Avatar
    djevica Posts: 3, Reputation: 1
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    #4

    Jul 25, 2009, 11:29 AM
    The only "C" it has is next to the R. Rc and Rh. If the Blue goes with the Rc, then I don't need the wire linking Rh and Rc? Says I don't need it for a 5 wire hook up.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #5

    Jul 25, 2009, 12:09 PM
    Hook up your w-r-y-g,, with jumper,, tape up and tuck away the blue not to be needed
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