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    alero19's Avatar
    alero19 Posts: 1, Reputation: 1
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    #1

    Feb 5, 2010, 08:24 PM
    How do you wire an RTH221B thermostat?
    I am trying to replace my thermostat it is an RTH221B on a Carrier Central A/C, but I do not find the wire color codes on that unit, they use different colors on those wires.
    Thank you.
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #2

    Feb 5, 2010, 09:31 PM

    Tell us the way the old one wired up and the options of the new one.
    perand's Avatar
    perand Posts: 1, Reputation: 1
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    #3

    Jun 25, 2012, 09:55 AM
    The old thermostat terminal are G,F red wire - C grey wire- H orange wire- V white wire
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