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  1. #14
    Join Date
    Oct 2001
    Posts
    6,942
    1" minimum between the bottom of the 1st elbow out of the pan and the top of the last elbow out of the trap into the run out line. 2" is better on larger style Trane units where the unit is pulling the air thru the coils
    "when in doubt...jump it out" http://www.youtube.com/watch?v=U1qEZHhJubY

  2. #15
    Join Date
    May 2012
    Location
    WA
    Posts
    8
    I have always installed a riser vent prior to the trap to alleviate this problem.

  3. #16
    Join Date
    Sep 2006
    Location
    Ohio
    Posts
    456
    Quote Originally Posted by NWAIR View Post
    I have always installed a riser vent prior to the trap to alleviate this problem.
    I think the vent needs to be after the trap, if it's before the trap, the unit will suck air through the vent.

  4. #17
    Join Date
    May 2004
    Location
    SE Pennsylvania
    Posts
    894
    Vent prior to trap would negate the trap. I worked with a guy years ago that said he used swing check valves, never did it myself so I have no idea if it would work.

  5. #18
    Join Date
    May 2012
    Location
    WA
    Posts
    8
    The vent needs to be before the trap. Yes, the unit will suck air though the trap during operation instead of sucking \ holding the water in the trap. The vent can be screened for sanitary concerns.

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