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    jmw1's Avatar
    jmw1 Posts: 4, Reputation: 1
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    #1

    Nov 4, 2013, 04:41 PM
    General controls thermostat wires labeled m t v h
    The wires going into my old general controls thermostat are labeled M, T, V, and H. how does this conform to Honeywell's B, O, G, Y, W, R, and Rc on theRTH2300/RTH 221 series thermostat?
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #2

    Nov 4, 2013, 04:57 PM
    I have no idea other than to suggest you jot down which color wire is attached to which terminal of the thermostat & then do the same at the furnace. With that information we can probably help you with the wiring.
    Right from the start, we can rule out any connection to B or O.
    Do you have A/C? If not, we can rule out Y.
    jmw1's Avatar
    jmw1 Posts: 4, Reputation: 1
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    #3

    Nov 4, 2013, 05:04 PM
    They are all black. No A/C... I think V is black and H is red from previous research.
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    jmw1 Posts: 4, Reputation: 1
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    #4

    Nov 4, 2013, 05:11 PM
    Quote Originally Posted by jmw1 View Post
    They are all black. No A/C... I think V is black and H is red from previous research.
    The M T V and H are factory labels on the old thermostat... general controls catalog #Y270A100, with serial # B8A51
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    jmw1 Posts: 4, Reputation: 1
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    #5

    Nov 4, 2013, 05:12 PM
    Quote Originally Posted by jmw1 View Post
    The M T V and H are factory labels on the old thermostat... general controls catalog #Y270A100, with serial # B8A51
    ..
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #6

    Nov 4, 2013, 05:48 PM
    All black, wonderful. Without being there, I'm not going to be able to help, sorry.
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