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    hvacman's Avatar
    hvacman Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jun 8, 2008, 08:55 AM
    Fan relay
    How do you wire a fan relay on an old furnace that has air conditioning
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jun 8, 2008, 09:53 AM
    You need a 24 volt supply to activate the relay( common from transformer and power wire from the thermostat Y connection and then you jump the furnace fan control with the other side of the relay which will activate the fan in the cooling mode.
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