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  1. #14
    Join Date
    Nov 2004
    Posts
    2,927
    Originally posted by dhvac
    I use a 4 hose manifold I hook up the high and low side as normal vacuum hose to vacuum pump and charging hose to micron gauge
    Am I missing something??? Should I change what I’m doing?
    That's the only way to fly...

  2. #15
    Join Date
    Apr 2005
    Posts
    333
    If you had a leak would the pump even allow you to pull down to, say 300 microns?
    meanwhile, back at the ranch.....

  3. #16
    Join Date
    Sep 2004
    Posts
    172
    When you give a lesson in meanness to a critter or a person, don't be surprised if they learn their lesson.

  4. #17
    Join Date
    Apr 2005
    Posts
    333
    dnt,

    I don't understand what you meant by Sea Level. I'm still confused whether you can pump down to 300 microns if there can be a leak in a system.

    Can anyone else answer my question?
    meanwhile, back at the ranch.....

  5. #18
    igwt777 is offline Professional Member - T&B bad email address
    Join Date
    Jul 2005
    Posts
    172
    Originally posted by bittan
    dnt,

    I don't understand what you meant by Sea Level. I'm still confused whether you can pump down to 300 microns if there can be a leak in a system.

    Can anyone else answer my question?
    You can pump down a system to 300 microns and still have a leak. The key is if your system vacuum level does not rise above 1000 microns, then you can call it a "thight system" not a leak free system.

    BTW the best way to check for leaks is rising the system pressure using nitro to 200 psi and watch if it holds. I your pressure goes down then add a trace of R22 and use your electronic leak detector.

    Hope this help!

    igwt777

    [Edited by igwt777 on 07-25-2005 at 12:14 AM]

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