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  1. #1
    Join Date
    Nov 2019
    Posts
    1
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    Understanding current setup

    I am trying to upgrade my thermostat and noticed setup of my current setup is a little unusual. I tried asking questions at Home Depot and Lowes but they were not sure either; hopefully someone here may be able to help.

    Picture 1 is my current thermostat - as you can see there is an adapter that splits a single black wire into the Y and W wire. No one seems to know what this adapter is, or if it is simply a splitter.

    I then went down to my furnace to see the origin of the black wire. In picture 2, you can see there is some sort of adapter that is connected between the furnace and the wires that go to the thermostat. What is the purpose of this adapter? Picture 3 shows the wire that goes to the thermostat. You can see there are only 4 wires, and that there is a jumper between the Y and W and the black wire is connected to the Y.

    The reason I need to sort this out is that with my new thermostat, the Y and W are on the opposite side. I will not be able to use the existing Y/W splitter to connect both Y and W to the respective terminal hole (the wire is not long enough). Ideally I can get 2 separate wires for Y and W? Assuming I have an extra unused wire, can I just remove the jumper between Y and W (in Picture 3) and attach a new wire to Y?

    I apologize if this sounds confusing but this is the first time I'm messing with a furnace/thermostat.
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  2. #2
    Join Date
    Sep 2007
    Location
    State College, PA
    Posts
    2,908
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    Sorry, no DIY on this site. Please read the rules above.
    Can someone please explain to me -
    Why is there never enough time to do it right the first time, but plenty of time to do it twice?


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  3. #3
    Join Date
    Sep 2007
    Location
    edmonds wa
    Posts
    4,427
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    It was used when you did not have enough wires when you add AC and needed the extra wire for cooling. Find a older tech who knows how to fish wiring and run new wire to stat, 18/10 for all your future needs.
    UA Local 32 retired as of Jan 2020

  4. #4
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    25,725
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    Quote Originally Posted by buford View Post
    It was used when you did not have enough wires when you add AC and needed the extra wire for cooling. Find a older tech who knows how to fish wiring and run new wire to stat, 18/10 for all your future needs.
    How in the hell did we do it all those years?

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