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    Crazyg999's Avatar
    Crazyg999 Posts: 5, Reputation: 1
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    #1

    Aug 6, 2010, 05:38 PM
    What does a relay do on a Trane XL-80
    Mh
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Aug 6, 2010, 05:43 PM

    It allows Large Current/Voltage to be controlled by small low voltage wires from thermostat.
    In most AC's, the relays/contactors are controlled by 24 volts AC.
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