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

    Apr 30, 2010, 10:42 AM
    How do I change out a ganeral controls t-99 thermostat to a digital.
    I only 2 wires, a white or yellow and a black, what letters on my new thermostat should they be connected to. I only have a heating unit.
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #2

    Apr 30, 2010, 11:05 AM

    R and w
    tgeezy's Avatar
    tgeezy Posts: 3, Reputation: 1
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    #3

    Apr 30, 2010, 04:54 PM
    Quote Originally Posted by Joshdta View Post
    r and w
    Thanks Joshdta a but my new thermostat only has the letters... E, AUX, Y, G, O, L, R, B, and C(optional).
    tgeezy's Avatar
    tgeezy Posts: 3, Reputation: 1
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    #4

    Apr 30, 2010, 04:54 PM
    Quote Originally Posted by Joshdta View Post
    r and w
    Thanks Joshdta but my new thermostat only has the letters... E, AUX, Y, G, O, L, R, B, and C(optional).
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #5

    Apr 30, 2010, 05:10 PM

    R and e and you will have to put the new stat to emergency heat. As this is a heatpump stat
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