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    Reentoe's Avatar
    Reentoe Posts: 2, Reputation: 1
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    #1

    Nov 10, 2012, 03:18 PM
    What if red and white wires aren't labelled?
    Hello,

    I just moved into a new house and I am looking to upgrade to a programmable thermostat. My old thermostat is mercury based and has only two wires; the problem is that neither wire is labelled and they are both exactly the same colour. How do I tell which is W and which is Rh?

    Ben
    Reentoe's Avatar
    Reentoe Posts: 2, Reputation: 1
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    #2

    Nov 10, 2012, 08:56 PM
    Follow up - the two copper wires themselves seem to be quite thick. It is not a high voltage thermostat (max 30V), just very old. Probably original to the house, which is about 50 years old.

    Can I still install the programmable digital thermostat I bought?
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