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  1. #1
    Join Date
    Jun 2019
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    3
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    Question Screw chiller with capacity controller slider valve.compressor not loading beyond 50%

    Our screw chiller with capacity controller slider valve arrangement not getting loaded beyond 50%

  2. #2
    Join Date
    Nov 2011
    Location
    East Side
    Posts
    6,338
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    Model number?

    Operating log?

  3. #3
    Join Date
    May 2004
    Location
    Salt Lake City/Tooele
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    Probably the stunod rod is jammed.

  4. Likes shellkamp liked this post
  5. #4
    Join Date
    Jun 2019
    Posts
    3
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    Thread Starter
    What is stunod rod

  6. #5
    Join Date
    Nov 2004
    Location
    up in the hizzy
    Posts
    3,274
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    Quote Originally Posted by slctech View Post
    Probably the stunod rod is jammed.
    Thats what I was thinking, very common issue with screw compressors, the inverted metric threads are deeply embedded and impossible to break apart.
    There is not better place for the working men than the union! 100% UA the only HVAC union!

  7. #6
    Join Date
    Jun 2019
    Posts
    3
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    Thread Starter
    If stunod is jammed then how can we normalise or?

  8. #7
    Join Date
    Oct 2005
    Location
    B.C. Canada
    Posts
    1,211
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    Usually a little lube on the stunod Rod breaks it free... we prefer a non petroleum based stunrod knob lube.


    Sent from my iPhone using Tapatalk

  9. #8
    Join Date
    Oct 2005
    Location
    B.C. Canada
    Posts
    1,211
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    I like a non polarized lithium ion based lube


    Sent from my iPhone using Tapatalk

  10. #9
    Join Date
    Jan 2010
    Location
    Sea to Sky
    Posts
    3,218
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    Astroglide....for your Stunod rod.

    Sent from my SM-G965W using Tapatalk

  11. #10
    Join Date
    May 2004
    Location
    Salt Lake City/Tooele
    Posts
    5,229
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    Get PRO membership and I can go deeper on a stunod rod.

  12. #11
    Join Date
    Jan 2010
    Location
    Sea to Sky
    Posts
    3,218
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    No pro membership, so just the tip for now?
    Quote Originally Posted by slctech View Post
    Get PRO membership and I can go deeper on a stunod rod.
    Sent from my SM-G965W using Tapatalk

  13. #12
    Join Date
    Jul 2007
    Location
    The Hot South
    Posts
    2,235
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    Another possibility could be the base plate of pre-famulated amulite surmounted by the two spurving bearings could be stuck. It’s a pretty easy fix…

  14. #13
    Join Date
    Apr 2018
    Posts
    66
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    What brand and model of machine? Could be a couple things. Leaking unload solenoid valve, clogged load solenoid, stuck piston, leaking wear rings on piston. Good bit of things to rule out there too determined the issue.

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