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