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  1. #1
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    HVAC, Replacing a thermostat question.

    I have an home built in the 80s. It has 3 zones for heat/central air, I would like to replace the thermostat with a newer one nothing fancy just updated.

    Looking at some the wire diagrams and the wires I have, it really doesn't make sense to me. Anybody know anything about this type of wiring or how I can go about to replace it.


    Thanks.
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  2. Member Wayne P.'s Avatar
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    Wayne Purdum
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    #3
    Label all the wires, new thermostats will have the same letters.

  4. Member Bsktball55's Avatar
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    #4
    When you get the new thermostat, it will tell you were to hook up each wire. There will be several options depending on your current setup. I had to fish the main wire out of the wall and add another wire to mine and then go down to the furnace and hook it up down there as well. Took me a little bit to figure out what was wrong, but it was easy to fix.

  5. Member
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    #5
    Your going to run into some confusion I can see that , you might not need all those wires on a new stat.
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  6. Member Tom B's Avatar
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    #6
    its like a 5 minute install to install a nest - take pic of old one and match up to letters on new one

  7. Member Gaston Mike's Avatar
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    #7
    they also have a helpline you can call
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  8. Member pa.X19's Avatar
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    #8
    Quote Originally Posted by Matt20xd View Post
    Label all the wires, new thermostats will have the same letters.
    This ^^ and color matters

  9. Member
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    #9
    Quote Originally Posted by Tom B View Post
    its like a 5 minute install to install a nest - take pic of old one and match up to letters on new one
    can I hire you? My son works for me he takes 20 minutes to install a 2 wire tstat a seven wire forget it 30-35 minutes , I thought he was slacking ... I let him handle the small hard to see wiring my old eyes can't see to think all this time it was a 5 minute job.
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  10. Member Tom B's Avatar
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    #10
    Quote Originally Posted by av View Post
    can I hire you? My son works for me he takes 20 minutes to install a 2 wire tstat a seven wire forget it 30-35 minutes , I thought he was slacking ... I let him handle the small hard to see wiring my old eyes can't see to think all this time it was a 5 minute job.
    haha - maybe mine was lucky but thought it would of been hard when I did it and was amazed it worked first time - the instructions were pretty good

  11. Member suck my wake's Avatar
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    #11
    If it’s a heat pump the wiring is a little more tricky.

  12. Member
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    #12
    Quote Originally Posted by Tom B View Post
    haha - maybe mine was lucky but thought it would of been hard when I did it and was amazed it worked first time - the instructions were pretty good
    I think he spends time cutting wires for new exposed copper , uses a level , the plastic anchors . . We are heating contractors .
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  13. Member Toypuller's Avatar
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    #13
    That looks like 2 t-stat cables used as 1.

    2 red, 2 white, 2 green, blue used as W2, a green used for the Reversing valve.

    Look deeper into the wall, see what your dealing with.
    Give a man a fish, he will eat for a day

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    #14
    .
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