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Thread: Leak test?

  1. #1
    Join Date
    Dec 2011
    Location
    Iowa
    Posts
    17
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    Leak test?

    How do you leak test during an install/repair? The guys I work with call it good if they pull a vacuum down past 500. I just had this fail for me so now I've been valving off the pump and making sure I don't raise past 1000 microns. I'm wondering what others do & what is considered the best way to rest assured there will be no call back.

  2. #2
    Join Date
    Jan 2010
    Location
    Vancouver Island
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    499
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    You should be pressure testing the system first with nitrogen to ensure no leaks.

  3. #3
    Join Date
    Jan 2011
    Location
    Boston, MA
    Posts
    461
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    Run your line set first and all hooked up. Then leave in a pressure test until the rest of the job is finished.

  4. #4
    Join Date
    Apr 2011
    Location
    Appleton, Wi.
    Posts
    32
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    Pressure test with nitrogen before pulling vacuum. The nitrogen will also remove some moisture if the system has been open for a while. We try to shoot for 300-400 micron vacuum and let it stand for 30 min or so.

  5. #5
    Join Date
    Apr 2012
    Posts
    17
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    Pressure test with your inert gas,let stand,pull your vacuum 300 to 500 microns,let stand,should be ready to charge.

  6. #6
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    2,923
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    pressure test joints with combo of nitro and refrig, jusst enough the leak detecter could pick it up, pull a vac to below 300, blank off pump and watch to see it it raises above 500 in less than a min. If it does you either have a leak or moisture.

  7. #7
    Join Date
    Apr 2011
    Location
    Cayuga, In
    Posts
    56
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    i pressure test with nitrogen and make sure it holds then pull vacuum 500 microns make sure it holds and when all good, charge.

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