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  1. #1

    help pumping a freezer down

    I closed the liquid line and turned unit on, suction gauge showed it being pulled to a vaccuum but liquid gauge would not pump down, what am i doing wrong? to much gas in unit?

  2. #2
    Join Date
    Jun 2005
    Location
    Ohio
    Posts
    1,716
    Quote Originally Posted by low voltage View Post
    I closed the liquid line and turned unit on, suction gauge showed it being pulled to a vaccuum but liquid gauge would not pump down, what am i doing wrong? to much gas in unit?
    LLS open?
    Where are you taking the liquid line pressure?
    jogas

  3. #3
    Join Date
    Sep 2006
    Location
    Winter Springs, Fl
    Posts
    1,755
    if you closed off the LL service valve ( not at compressor ) and pumped the unit down with the LLSV shut and had your manifold high side on the service port after the LL service valve, you won't detect a change because the LLSV is holding a charge in the liq. line. you have to manually open the LLSV w/ a strong magnet or energize it to remove all of the charge. don't run the comp too long in a vac. you will nuke the windings.
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  4. #4
    Join Date
    Nov 2006
    Posts
    460
    Depending on the kind of service valve you have on the receiver, when you front seat the valve your guage port is live to the tank not the line.
    This is the most common style of receiver king valve.

  5. #5
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

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    yes what they said!



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