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    josh deas's Avatar
    josh deas Posts: 7, Reputation: 1
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    #1

    May 12, 2009, 05:33 PM
    Changing out thermostats
    I need to change a lennox 51h4001 thermostat to a vision pro TH8000 thermostat. I need to know where the wires land on which terminals on the new thermostat. If anyone could help it would be very much appreciated.
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #2

    May 12, 2009, 06:11 PM

    Do you have a gas furnace? Or electric? Heatpump or ac?
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    josh deas Posts: 7, Reputation: 1
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    #3

    May 12, 2009, 06:19 PM

    Electric
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    Joshdta Posts: 2,549, Reputation: 45
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    #4

    May 12, 2009, 06:20 PM

    OK and you have a heatpump or just a ac unit?
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    josh deas Posts: 7, Reputation: 1
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    #5

    May 12, 2009, 06:21 PM

    Yeah its has a heat pump also
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    #6

    May 12, 2009, 06:24 PM

    OK do you still have your old t-stat on the wall?
    If so let me know what colors are on what terminals now.
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    josh deas Posts: 7, Reputation: 1
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    #7

    May 12, 2009, 06:27 PM

    Yeah it goes w1-orange, o-black, g-green, c-yellow, rh-blue, y1-red
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    #8

    May 12, 2009, 06:31 PM

    Every single wire is backwards except for green. Lol but you will have to wire it back this way or you will have to change the wires at the furnace also. Your old stat did work the way this is wired right? If so I will give you the list for the new wiring.
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    #9

    May 12, 2009, 06:34 PM

    Yeah lol it works like this I thought it wasn't making sense when I was reading the instructions for the new one
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    #10

    May 12, 2009, 06:37 PM

    Ok if we go by the way you have it now.

    R-blue jumped to rc
    G-green
    o-black
    c-yellow
    Aux-orange jumped to e
    y-red
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    josh deas Posts: 7, Reputation: 1
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    #11

    May 12, 2009, 06:46 PM

    On this new t-stat on the left side it only has 2 terminals s1 and s2 on the right side it goes rc and r with a metal jumper , w, y, g, and c
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    #12

    May 12, 2009, 09:12 PM

    There must be more then that is this a 2 heat 2 cool stat?
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    #13

    May 13, 2009, 09:16 AM

    Yeah I think
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