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

    Dec 9, 2012, 02:40 PM
    Analog Thermostat to Digital... C wire?
    We have a two wire old analog thermostat it has a black wire that I think was red before (had some wiring redone recently) and a white one. There's also a purple one but I am not sure what its connected to.
    Old thermostat is a White-Rodgers it says Type 1C20-101 and then E1 0539T.
    The new one is a digital wifi touchscreen from Honeywell and it asks for a C wire also. RTH858WF is the model number.
    http://wifithermostat.com/wifi-programmable-thermostats

    Can we use it? Any help will be appreciated :)
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #2

    Dec 9, 2012, 06:50 PM
    If the new thermostat can be battery powered, you probably don't need the common wire.
    Romansamurai's Avatar
    Romansamurai Posts: 2, Reputation: 1
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    #3

    Dec 11, 2012, 01:24 PM
    Quote Originally Posted by Grady White View Post
    If the new thermostat can be battery powered, you probably don't need the common wire.
    Yes. It has a battery! Ok awesome I will try that. Also the electrician changed the wires from small to thicker. Is that OK? Jw.
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #4

    Dec 11, 2012, 06:27 PM
    How thick is "thicker".
    Thermostat wire should be 18 gauge. Telephone wire is usually 22 gauge & house wire is 12 or 14 gauge. The lower the gauge number the thicker the wire.
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