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  1. #1
    Join Date
    Feb 2006
    Location
    SouthEastern Virginia
    Posts
    1,075

    Aaon Makeup Air Unit

    Found a defective condenser fan cycling switch on one of these the other day. Does anyone know if there is a schrader core in the fitting? It is located in the discharge line.Thanks.

  2. #2
    Join Date
    Dec 2001
    Location
    Southern Tier, NY
    Posts
    6,066
    AAON .. makesa lotta work for me ...

    ther's no good answer to your Q

  3. #3
    Join Date
    Feb 2006
    Location
    SouthEastern Virginia
    Posts
    1,075
    Slim you think the schrader could be hit or miss? I think I will just pull the charge and err on the side of caution.

  4. #4
    Join Date
    Mar 2007
    Posts
    3,108
    I'd back the flare nut out until I heard a faint hiss, and leave it until the hiss either stopped... or didn't. If it didn't within a reasonable amount of time like a few seconds, I would assume there's no valve core.

    Some manufacturers are nice enough to provide you with a label stating whether or not valve cores are installed.
    "There is no greater inequality than the equal treatment of unequals."

    -Thomas Jefferson

  5. #5
    Join Date
    Apr 2005
    Location
    Chicagoland
    Posts
    209
    All of their RTU's that I've done has always had schraders on the fan cycle and low pressure switches

    But everytime I do one I'm prepared just in case

  6. #6
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,060

    Smile Beware FYI:

    The unit probably has a schraeder core in it and most earlier equipment also had cores in the high side, but on newer equipment look for a tag on the high pressure side stating that it is a live port. New UL listings consider a core between the high pressure safety switch to be a valve and no longer allowed.

  7. #7
    Join Date
    Oct 2003
    Location
    Tampa Bay
    Posts
    131
    Heads...there is a core

    Tails...there is not a core


    Assume there is not one just in case...play it safe. Being on the discharge line, it's too close to the weekend to show off your new tatoo from the gas.
    Some people just aren't smart enough to be stupid....

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