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  1. #14
    Join Date
    Jun 2008
    Location
    Houston, TX
    Posts
    48
    If your vacuum stood with no pump at 300 for 72 hours you dont have a leak. You may have had one like a relief but you think you would have seen evidunce of that. Put oil in the reliefs or balloons on them. If you really thing theft is an issue get a camera on it. Perhaps even a game camera if its secluded where it wouldnt constantly take photos of people on the other side of the fence.

  2. #15
    Join Date
    Jul 2010
    Posts
    59
    One of our chillers only leaked while the oil pump was running. Is it an open drive?

  3. #16
    Join Date
    Apr 2011
    Posts
    28

    Arrow LEAK TEST

    YOU CAN MAKE A LEAK TEST IN THE TERMINAL BOX OF THE COMPRESSOR AFTER YOU CHARGED IT WITH NITROGEN (WE FOUND IT BEFORE )
    DONT FORGET TO CUT THE POWER OFF

  4. #17
    Join Date
    Mar 2005
    Location
    Cleveland, Ohio
    Posts
    11
    I have had to replace the oil feed line valves on my YCAS. During the winter the valves would leak because of shrinkage. I put in some good isolation valves and have not had the problem since.

  5. #18
    Join Date
    Feb 2009
    Location
    good old Europe
    Posts
    160
    O-Rings can start leaking under cold conditions and reseal after it warms up. I suspect the oil separator sight glasses, could be such point. But i would also check out the motor terminal gaskets on the compressor. Best is, to wait until low ambient temperature reoccur and then check during this time.
    "Quality exists, when the price is long forgotten."

    Henry Royce

  6. #19
    Join Date
    Apr 2012
    Location
    So. Fl.
    Posts
    57

    Talking

    Same here,main chiller shut down for the so-called here in
    Florida. Bldg. would run small 300 tn chiller. Summer came
    Large 450tn, lost partial charge, loaded with air(low pressure)
    After spring start-up, and after a months run time,went back.
    I put my compound gauge on purge exhaust and watched it
    Pull down to avacuum. Wasnt seating correctly. Replaced it &
    Did good after that, while I was working for York then

  7. #20
    Join Date
    Sep 2007
    Location
    Somewhere in the world.
    Posts
    1,618
    I tend to believe in the o-ring theory but I would like some more info.
    1st. What type of air cooled are we speaking of ?
    2nd. Is the power for this Chiller being turned off to winterize ?

    Because o-rings will shrink with colder temps and expand with higher temps.
    Arguing with your Boss is like wrestling with a pig in
    mud.
    After a while you realize that while you are getting
    dirty, the pig is actually enjoying it.

    It is not exactly cheating, I prefer to consider it
    creative problem solving.

    25 years ago we had Bob Hope , Steve Jobs , and Johnny Cash today we have no Hope no Jobs and no Cash !
    I can fix broke but i can't fix stupid !

  8. #21
    Join Date
    Apr 2011
    Location
    Appleton, Wi.
    Posts
    32
    Well we've done two leak checks over the winter and found nothing. Air cooled as in air cooled condenser, no cooling tower.

  9. #22
    Join Date
    Oct 2006
    Location
    Central Texas
    Posts
    649
    You really pulled that circuit down to 300 microns and it held for 72 hrs? No outgassing, no rise at all? I'd say you've got a pretty tight circuit or broke micron gauge. This has been going on for 6 yrs? How about recovering the charge for storage before winter shutdown, and put the charge back in the Spring. What type of machine is this? Hope this helps.
    Sic Semper Tyrannis.

  10. #23
    Join Date
    Apr 2012
    Location
    So. Fl.
    Posts
    57

    Lightbulb

    I can understand ur frustration, it may b in the cooler bundle.
    York56,please confirm aren't cooler (pudin locales) rated to
    150psig. OP. inquire or check if they issues w/air in the loop
    System. Sometimes it Can go unnoticed by maint. Personnel.
    Its happened before, 2x since I've been in thee field.
    Can happen. Hope this helps.

  11. #24
    Join Date
    Apr 2011
    Location
    Appleton, Wi.
    Posts
    32
    It has been going on for 6 years, but it doesn't happen every winter. Pulling the charge for the winter is an option we talked about, but my boss wants to solve the problem. It was a rather mild winter in Wisconsin this year, not sure if that changed anything or not. I guess well see at start up.

  12. #25
    Join Date
    Apr 2012
    Location
    So. Fl.
    Posts
    57

    Hmm

    Since it is a York screw,only saw this once,after the repairs
    Were made. There have been leaks associated w/the bottom
    Of the oil separator nut. Usually leaves some residue behind.

  13. #26
    Join Date
    Oct 2011
    Location
    South Georgia
    Posts
    73
    I have found compressor terminal seals leaking on air cooled chillers. Same symptoms as yours, with everything appearing tight. When the compressor is warm no leakage, let the weather get to below 40 and compressor not running and the terminals leak. Look for oil stains around the compressor terminals. If unit is off line and weather is not cold, try packing bags of ice on the compressor and leak test with motor sensor temperature as low as you can get it.

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