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-   -   Furnace drain (https://www.askmehelpdesk.com/showthread.php?t=300949)

  • Jan 8, 2009, 12:14 PM
    marathon man
    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?
  • Jan 8, 2009, 01:01 PM
    hvac1000
    That noise is somewhat normal. The unit is under negative pressure.

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