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    peggyw's Avatar
    peggyw Posts: 1, Reputation: 1
    New Member

    Jan 27, 2006, 11:05 AM
    Installing thermastat
    Hi. I'm trying to install a programmable thermastat and the directions say to mark the wires before taking them off the old one. They are not marked at all anywhere. I have a red and a white one. Any idea what I should mark them as? Any help would be so appreciated. The electrition I called wants $130.00 to install it for me.
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member

    Jan 27, 2006, 11:18 AM
    Glad you had the good sense to post here. The red wire, hot from the transformer, goes on R or RH. The white wire to the gas valve or whatever, goes on W or W1. If the new thermostat doesn't have R or W, pick through its instructions and see if it says how the hot and gas valve terminals are marked. Some thermostats need a third wire from the common side of the transformer to a B or C terminal.

    If this doesn't do it, post back with details, and I will try again.
    janicemay's Avatar
    janicemay Posts: 1, Reputation: 1
    New Member

    Dec 1, 2007, 08:46 AM
    Comment on labman's post
    Perfect. Just what I was looking for, a life saver. Thanks.

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