Tapping Coming From Primary Condensate Line
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  1. #1
    Join Date
    Aug 2011
    Location
    Virginia
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    6

    Tapping Coming From Primary Condensate Line

    It's a steady tapping or knocking sound. I removed the side cover from the air handler while it was running and the blower seems fine. No bearing problems or other noticable issues. If I completely plug the end of the condensate line, the sound disappears. Any ideas on what the noise source might be?

  2. #2
    Join Date
    Apr 2010
    Location
    SC
    Posts
    27

    Drain Trap

    Sounds like you dont have condensate trap or the trap is not correctly installed. What type of A/H do you have, model number and make might help.

  3. #3
    Join Date
    Aug 2011
    Location
    Virginia
    Posts
    6
    Thanks for the response elroho. I bought the house last summer, the airhandler is older. I'll need to get back in the attic tonight to get the info.

  4. #4
    Join Date
    Aug 2011
    Location
    Virginia
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    6
    I don't remember seeing a trap up there. Do these EZTraps work?http://www.hvacsolutionsdirect.com/i...files/1711.pdf

  5. #5
    Join Date
    Apr 2009
    Location
    San Diego
    Posts
    75
    its called air hammering and a trap and tee after the trap will fix the sound

  6. #6
    Join Date
    Aug 2011
    Location
    Virginia
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    6
    By tee, I assume you mean a vent? I'm on it. Lowes here I come.

  7. #7
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,334
    Quote Originally Posted by Haryy Homeowner View Post
    By tee, I assume you mean a vent? I'm on it. Lowes here I come.
    Before you go chopping up your drain line and creating more problems than you solve, two traps in one line is not a good idea.

    The first thing I think of is vibration. A few ty wraps or clamps would solve that problem. Putting your hand over the end has the effect of securing the line temporarily.

    The next thing would be excessive air pressure causing bubbling or gurgling through the trap. This indicates the need for a professional to properly diagnose and remedy the problem.

  8. #8
    Join Date
    Aug 2011
    Location
    Virginia
    Posts
    6
    Thanks so much. This is all very helpful guys.
    I can say that the problem is not from vibration. That's what I had originally hoped was the cause. I've checked for that.
    I guess it's possible that my unit has an internal trap. I'll have tio figure out how to access that section of the unit.
    Would excessive preesure cause air to be blowing out of the condensate drain line?
    Can I test for excessive pressure by simply opening up the duct on the discharge of the blower and if the tapping stops, I'll know that's the problem?

  9. #9
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,334
    Quote Originally Posted by Haryy Homeowner View Post
    Thanks so much. This is all very helpful guys.
    I can say that the problem is not from vibration. That's what I had originally hoped was the cause. I've checked for that.
    I guess it's possible that my unit has an internal trap. I'll have tio figure out how to access that section of the unit.
    Would excessive preesure cause air to be blowing out of the condensate drain line?
    Can I test for excessive pressure by simply opening up the duct on the discharge of the blower and if the tapping stops, I'll know that's the problem?
    A single trap is all that is required in a drain.

    Testing for air pressure requires a manometer.

  10. #10
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,334
    Quote Originally Posted by C Combs View Post
    its called air hammering and a trap and tee after the trap will fix the sound
    C Combs,

    Please read the AOP forum rules.

    You have the post count, so apply for Professional Membership to gain access to the Technical Forums.

  11. #11
    Join Date
    Aug 2011
    Location
    Virginia
    Posts
    6
    There was no trap in the condensate drain line. I installed a trap and vent and the knocking 's gone. Thanks.

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