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  1. #1
    Join Date
    Mar 2016
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    Yes, an un-trapped condensate line can hold back the flow.

    This is my first attempt at a You Tube video. I came across this last week.

    My work started at the condenser because the complaint was that the outdoor unit was short cycling.

    While removing the access panel, I could hear the condensate drain line gurgling as the blower in the air handler continued to run.

    I took the video before going into the attic. There I found that the drain was in fact not trapped, and that the air handler cabinet was sloped away from the drain. About a half inch of condensate was in the evaporator pan.

    https://youtu.be/B6jVakY-J-M
    It's an upside down world we live in.

  2. Likes HVAC_Marc liked this post
  3. #2
    Join Date
    Mar 2013
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    Billington Heights, NY
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    was it a negative pressure coil or were there other issues that needed to be addressed? (fan too fast, undersized ducts, etc)

  4. #3
    Join Date
    Mar 2015
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    Medford, N.Y.
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    Then, I say GOOD man,Goodman. I hope you were allowed to make a repair.

  5. #4
    Join Date
    Sep 2002
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    Virginia
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    have you ever come across a trap that wouldn't drain because the air filter was so clogged up ?

  6. #5
    Join Date
    Dec 2005
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    Quote Originally Posted by Snapperhead View Post
    have you ever come across a trap that wouldn't drain because the air filter was so clogged up ?
    Yes, several times. I had one recently where I tried everything to clean the drain out, but water kept dripping. When I would take off the cover it would drain, so I figured it had to be something with the air flow. Then I found the filter in a return grill in the house was blocked solid. Replaced filter, problem solved.

  7. #6
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    Mar 2016
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    Thread Starter
    Quote Originally Posted by HVAC_Marc View Post
    was it a negative pressure coil or were there other issues that needed to be addressed? (fan too fast, undersized ducts, etc)
    It was a heat pump with electric backup. So, negative pressure at the evaporator coil.

  8. #7
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    Thread Starter
    Quote Originally Posted by Snapperhead View Post
    have you ever come across a trap that wouldn't drain because the air filter was so clogged up ?
    Nope, I haven't seen that (yet), but now I'll look for it.
    It's an upside down world we live in.

  9. #8
    Join Date
    Dec 2009
    Location
    Roswell, Georgia
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    Quote Originally Posted by Snapperhead View Post
    have you ever come across a trap that wouldn't drain because the air filter was so clogged up ?
    Yep. Seen it plenty , Especially Variable speed HP.....it has to get the air from somewhere. If it Can't get it from return, it will suck a hurricane thru the PVC drain and never let anything drain.

    I have learned to check filter first on a clogged HP drain!

    Helps to make extra deep drain traps in VS HP AHU's , especially if ductwork can't be improved a lot, like some townhouses where AHU unit in attic and return goes down 2 floors to bottom floor.

  10. Likes DOGBOY, HVAC/R 19 liked this post
  11. #9
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    Mar 2013
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    Quote Originally Posted by David Goodman View Post
    negative pressure at the evaporator coil.
    negative pressure applications require a trap and vent , as you likely know

  12. Likes David Goodman liked this post
  13. #10
    Join Date
    Nov 2008
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    Piney Flats, Tn.
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    Quote Originally Posted by HVAC_Marc View Post
    negative pressure applications require a trap and vent , as you likely know
    for the reason that your are hinting to.

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