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  1. #1
    Join Date
    Nov 2004
    Location
    Atlanta, Ga. burbs
    Posts
    281
    What is the purpose of the J trap or P trap <?> that HVAC techs. put on the condensation line from the air handler?

    Thanks. And just curious I have one but just wondered what purpose it serves.

  2. #2
    Join Date
    Oct 2004
    Posts
    3,400
    Same as the trap under your sink.

    They're to prevent sewer gases from infiltrating your house.

    Especially if you have a draw-through evaporator.

  3. #3
    Join Date
    Nov 2000
    Location
    Upstate, SC
    Posts
    2,919
    The trap is to prevent the blower from pulling air up the drain line and holding water in the air handler. Without the trap, a drain on the negative side of the blower will only drain when the blower stops.

    Bobby

  4. #4
    Join Date
    Jun 2003
    Location
    Hell Hole Swamp
    Posts
    4,180
    Originally posted by bwal2
    Same as the trap under your sink.

    They're to prevent sewer gases from infiltrating your house.

    Especially if you have a draw-through evaporator.
    You run condensate lines into the sewer line?

    They break the vacuum created by the blower, or, in the case of a blow thru coil, prevent conditioned air from escaping through the drain line

  5. #5
    Join Date
    Oct 2004
    Posts
    3,400
    Originally posted by swampfox
    You run condensate lines into the sewer line?
    When code requires it.

    It does here.

  6. #6
    Join Date
    Mar 2002
    Location
    Richmond, Virginia
    Posts
    4,264
    Not sure who posted this link on here before, but I saved it for times like this. Happy reading.

    http://www.trane.com/commercial/issues/iaq/iaq5.asp
    There is nothing more frightful than ignorance in action....Mark Twain

  7. #7
    Join Date
    Oct 2004
    Posts
    3,400
    Originally posted by HVAC Pro
    Not sure who posted this link on here before, but I saved it for times like this. Happy reading.

    http://www.trane.com/commercial/issues/iaq/iaq5.asp
    That was me.

    I forgot where I put that!

  8. #8
    Join Date
    Mar 2002
    Location
    Richmond, Virginia
    Posts
    4,264
    Glad I posted it then. It is informative.
    There is nothing more frightful than ignorance in action....Mark Twain

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