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  1. #1
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    Sep 2015
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    chhn050 compressor

    Hi All,

    New to hvac talk. Been in hvac industry for 18 yrs, 13 in service. Would appreciate any advice on installing chhn050 compressor. Very little experience working with screw compressors. Going to install new compressor, replace oil, filter cores, pull vacuum, and recharge. Is there a specific procedure for making these repairs related to a screw compressor. The unit is a RTAA0904XJ01A0D0FG. I appreciate any and all advice. Thanks

  2. #2
    Join Date
    Jun 2010
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    U.A. (upper Alabama)
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    Pour a pint of oil in the suction of the new compressor. Prime the oil filter cavity with oil. Get the compressor changeout kit. It comes with all the o-rings and gaskets you need. The compressor will come with suction and discharge gaskets but no o-rings for oil supply line.

  3. #3
    Join Date
    Aug 2013
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    Las Vegas, NV
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    Have you worked on chillers before? Do you know how to properly charge the unit without damaging barrels? Also why is the compressor being replaced?

  4. #4
    Join Date
    Aug 2006
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    Mixing oil and fire with a big spoon.
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    You will probably get a bunch of smart-alec responses like "pour oil in the suction cavity", "prime the lines", "get ALL of the orings" and the like.

    I recommend that you remove the refrigerant first and DON'T change the bad compressor while the bad compressor is running. Just my opinion.

  5. Likes Tech Rob liked this post.
  6. #5
    Join Date
    May 2009
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    Jacksonville FL
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    Do ya hook up a Supco start kit to that there compressor....sometimes that gets a stuck one started


    Sent from my iPhone using Tapatalk

  7. #6
    Join Date
    Mar 2007
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    The CHHN screw compressor flugger valves are directionally sensitive, and you must use the right kind of jell-o. Also, some fluggers were incompatible with the kuhneutson valves used on B & C vintage chillers. You need to check the full model number to see which one you have so you know which flugger to use. It can be difficult to position the Y-ring as you're maneuvering the compressor into place. We usually use a 1/2 ton sky hook to help pull it in. If you've ever fought with a dresser coupling, you know what I mean.
    The key to happiness is lower expectations.

    Don't pick the fly crap out of the pepper.

  8. Likes BALloyd, jayguy liked this post.
  9. #7
    Join Date
    Sep 2015
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    Thanks

  10. #8
    Join Date
    Sep 2015
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    Compressor was grounded. I just finished recovering refrigerant and what oil I could get out of the separator. Will start compressor change tomorrow. Was not sure if I could charge liquid into liquid line, turn power on and let heaters run, and finish with vapor.

  11. #9
    Join Date
    Dec 2014
    Location
    New Mexico
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    When you get done with vacuum and hold at 500 microns or below for at least 4-5 hours. Have chilled water pump running and add vapor until saturation temp is above at least 36-38 degs F. Then add liquid to liquid line . Hopefully you can get over half the charge in. Set the % fla limit as low as you can. There should be an angle valve after the EXV. If so start compressor check amps make sure starting and running is good. Then add liquid to the angle valve. Should get some alarms like low superheat keep a eye on oil temp. , don't want it to get to cold( flooding). As you get gas in raise the % fla set point.
    It's a lot to watch at one time . Keep evap. sat. temp. up and oil temp up. Slow down and think it out. Everyone has start some where.


    Sent from my iPhone using Tapatalk

  12. Likes valdelocc liked this post.
  13. #10
    Join Date
    Jan 2010
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    Vancouver Island
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    Quote Originally Posted by Tech Rob View Post
    The CHHN screw compressor flugger valves are directionally sensitive, and you must use the right kind of jell-o. Also, some fluggers were incompatible with the kuhneutson valves used on B & C vintage chillers. You need to check the full model number to see which one you have so you know which flugger to use. It can be difficult to position the Y-ring as you're maneuvering the compressor into place. We usually use a 1/2 ton sky hook to help pull it in. If you've ever fought with a dresser coupling, you know what I mean.
    Finally....I knew my fluggometer would finally come in handy.

  14. #11
    Join Date
    Mar 2004
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    Quote Originally Posted by BALloyd View Post
    Finally....I knew my fluggometer would finally come in handy.
    You have had that one so long it's probably out of date , you need to upgrade to "fluggometer 6.0 plus"
    The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    In the garage , greasin', oilin' . tweakin' n shinin' Roll on spring 2015 !!

  15. #12
    Join Date
    Sep 2008
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    Quote Originally Posted by Healey Nut View Post
    You have had that one so long it's probably out of date , you need to upgrade to "fluggometer 6.0 plus"
    Damn, been in this game for coming up to 40 years now and survived to date without a fluggometer but looks like with this latest upgrade may have to relent now and get one
    Necessity is the mother of invention

  16. #13
    Join Date
    Mar 2004
    Location
    ottawa canada
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    Quote Originally Posted by Screwit View Post
    Damn, been in this game for coming up to 40 years now and survived to date without a fluggometer but looks like with this latest upgrade may have to relent now and get one
    Hopefully I can make it to retirement without having to buy the adjustable micro-claptometer.....
    The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    In the garage , greasin', oilin' . tweakin' n shinin' Roll on spring 2015 !!

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