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

    Aug 15, 2009, 10:48 AM
    Wiring from 3wire damper to 2wire
    My opposed automatic damper recently failed. I went out bought a new damper, wired the red to red, white to white, and have a blue left over. When calling for A/c the damper closes when off it stays open. I don't know if I bought the wrong damper, or if there is something a can do with the wiring. Please help
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Aug 15, 2009, 12:48 PM
    I have no idea how the original setup worked to start with. You might have had a old setup that was powered both open and closed and that would explain the three wire. Usually damper when replaced are done like same so there would have been no mystery if you would have bought a 3 wire to start with.
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