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    marathon man's Avatar
    marathon man Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 8, 2009, 12:14 PM
    Furnace drain
    I have a xl 90 trane furnace and I noticed that the condensation will only drain when the furnace shuts off.When the furnace is running I hear the drain vent pipe gurgling.is this normal?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 8, 2009, 01:01 PM
    That noise is somewhat normal. The unit is under negative pressure.
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