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  1. #1
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    574

    trane A/h plastic drain pan

    ive noticed tranes a/h units have a hole between the over flow drain and the main drain leaving the drain pan in the upright position! just curious whats the purpose of the hole? the customer had an over flow switch threaded in to the over flow hole but since it had a little build up near the hole the water had to rise higher than usual to activate the float switch.but due to the hole the water leaked out onto the floor never activating the float switch.

  2. #2
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    The hole is there to give water a path to leak to outside the cabinet if there is a drain problem when the air handler is in the downflow position.
    When it is installed in any other position, seal the hole up with some silicon caulk.

    I've also found that a lot of the float switches, that screw into the secondary drain opening, don't work well on a lot of air handlers, due to the layout of the holes vs the depth of the drain pan.
    If more government is the answer, then it's a really stupid question.

  3. #3
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    574
    Quote Originally Posted by mark beiser View Post
    The hole is there to give water a path to leak to outside the cabinet if there is a drain problem when the air handler is in the downflow position.
    When it is installed in any other position, seal the hole up with some silicon caulk.

    I've also found that a lot of the float switches, that screw into the secondary drain opening, don't work well on a lot of air handlers, due to the layout of the holes vs the depth of the drain pan.
    Sounds pretty logic to me thanks for the reply.

  4. #4
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,370
    what he said ^^

  5. #5
    Join Date
    Sep 2007
    Location
    San Antonio, Tx
    Posts
    23
    Silicone works well,old tranes had one in the back too

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