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    jenn37's Avatar
    jenn37 Posts: 1, Reputation: 1
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    #1

    Aug 12, 2008, 04:56 PM
    How to wire 5 wire to 4 wire thermostat
    I had a 5 wire honeywell mercury thermostat. I have changed it to a 4 wire programmable thermostat. How do I do that? So that I can have heat and airconditioning.
    esquire1's Avatar
    esquire1 Posts: 2,483, Reputation: 209
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    #2

    Aug 12, 2008, 05:48 PM
    Match the wires from the airhandler to the thermostat R,W,G,&Y. The common "C" will not be used.
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