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-   -   Do I connect old, unmarked thermostat wires to new thermostat? (https://www.askmehelpdesk.com/showthread.php?t=609548)

  • Nov 4, 2011, 07:00 PM
    ipbrjt3
    Do I connect old, unmarked thermostat wires to new thermostat?
    Hi folks, I have an old mercury Honeywell thermostat with two unmarked wires sticking out of the wall. They almost look like thin audio cables, with one lighter than the other. I was planning on replacing it with a new Thermostat for the forced hot air gas furnace (which is probably about 10-20 years old now). Would it damage either unit if I connect the wrong wires (i.e. switched) to the W and RH connectors on the new thermostat? Sorry if this sounds stupid. I'm obviously a noob.
  • Nov 4, 2011, 07:45 PM
    mygirlsdad77
    With your setup, just hook one wire to r and one to w and you will be fine. Doesn't matter which goes where. Hook er up, and you will be in heat. Take care, and please let us know how things work out.
  • Nov 4, 2011, 09:50 PM
    ipbrjt3
    Things worked beautifully! I also did some further research and read that this configuration is just an "interruption" in one line- so it doesn't really matter which is RH and W. Thanks for confirming it for me!
    :-)

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