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    davekaren's Avatar
    davekaren Posts: 2, Reputation: 1
    New Member
     
    #1

    Aug 29, 2010, 04:12 PM
    Wire
    How do I wire thrmostat with 4 wire. Ac outside has own transformer and heat inside has transformer
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Aug 29, 2010, 04:39 PM

    Most AC's have a transformer in Inside unit, through thermostat, then out to compressor contactor, no need for an outside transformer, unless it is used to power an electronic control/diagnostic board of some sort.
    Verify it is not a transformer, but a contactor.

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