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  1. #1
    Join Date
    Nov 2011
    Location
    South Texas
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    TRANE RTAA bearing noise suction side

    Guy's Got a RTAA you have been kind enough to lend a hand on through the years and shes been running like a top. Customer called me out unit was really loud. 2 weeks ago did full pm on it thought I heard the very early beginnings of a noise and advised them to call me if it got louder. I just wasn't sure I'm starting to have hearing trouble and it's really screwing with me sometimes on trying to troubleshoot stuff.

    Circuit B compressor has a audible bearing noise/ roughness and a higher pitched squeal than normal from startup through fully loaded sounds like it's directly at the suction inlet side about 6-8 inches inboard from the rear. This one sounds internal mechanical I don't think there could be any external causes. Are there any field replaceable bearings to change I shut it down so it doesn't kill itself. I realize compressor rebuild or bearing replacement isn't for your average tech but I've got the tools and work on complicated mechanical stuff all the time. Or is it just time to change out a screw and call it a day and move on down the old dusty trail

    No oil flow trip codes
    oil in separator within spec level
    oil still pretty and clean.
    condenser coil clean
    77 suction
    320 dp
    111 OAT in chiller area
    56 entering water
    40 degree leaving
    fully loaded running on 1 circuit only for diagnostics

    Thanks Guys have a great weekend

  2. #2
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
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    6,306
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    replace compressor if it is a problem. vibration analysis will confirm issue. there isn't a bearing at the back of the motor...only at the middle and front of the compressor.
    Don't step on my favorite part of the Constitution just to point out your favorite part.

    Political Correctness is forced on you because you have forgotten decency.

    Technically speaking, they are all heat pumps.

  3. Likes CHILLERSVCMAN liked this post
  4. #3
    Join Date
    May 2012
    Location
    California
    Posts
    604
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    Agree with Jay perform vib analysis or replace

    Sent from my SM-G930V using Tapatalk

  5. Likes CHILLERSVCMAN liked this post
  6. #4
    Join Date
    Jun 2003
    Location
    in a tree looking in your window
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    I've seen them run for years like that, I've had some so loud and screaming like they're going to blow up at any minute and they keep running for years, tell the customer it's making a bunch of noise and should be replaced, I've never seen anyone rebuild them in the field but there was a cool video on Youtube that shows them being rebuilt.

    https://www.youtube.com/watch?v=1wlI-5Cf0Kc
    If you dont stand behind our troops, please feel free...........to stand in front of them.

  7. #5
    Join Date
    Dec 2013
    Location
    Russia
    Posts
    152
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    I repair offen in field...

  8. #6
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,994
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    Broken discharge check valve .
    The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage and yes it still gives me goosebumps
    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 new big shop , greasin', oilin' . tweakin' n shinin' !!

  9. #7
    Join Date
    Apr 2018
    Posts
    25
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    I'd check psid across the oil filter as well. I've seen high differentials without giving an oil flow control diagnostic because the switch wasn't set or functioning properly. Should be set for 50psid. I've never seen the bearings replaced in the field and you're not supposed to. You'll never obtain the correct tolerances with the screws once taken apart in the field. All needs done at the factory. You just replace the compressor. Good luck.

  10. #8
    Join Date
    Nov 2011
    Location
    South Texas
    Posts
    82
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    Thread Starter
    Guy's I figured the best option was replacing it and it was reaffirmed by yall which helps me rest better. Customer opted for replacement problem solved shes cruzing right along now quiet as a church mouse. Well as quiet as any well running screw can be.

  11. #9
    Join Date
    Apr 2016
    Location
    Maryland
    Posts
    255
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    The " ONLY FIELD " opening of TRANE screws I have performed , was PUEBLO approved . I opened a few with thier approval . A special box of parts arrived to my house with a hand drawn sketch of what needed to be performed with hand written instructions .

  12. #10
    Join Date
    Apr 2018
    Posts
    25
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    You can open the screw compressor for service. But you can't change/ replace everything in the field. You can change male slide valve, male load/unload solenoid valves and female solenoid valve. Can't do anything with rotor bearings or female step valve.

  13. #11
    Join Date
    Oct 2011
    Location
    Upstate NY
    Posts
    133
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    As someone who almost became an auto mechanic out of high school in the 90's, ie. someone who loves rebuilding stuff, (I thank god I didn't go down that road) I came into the HVAC business with a company that would field rebuild just about anything.

    Much to my chagrin, but understandably, due to the requirements of additional tooling, training, warranty liability and last but not least, the explosion of compressor remanufacturing market resulting in plummeting reman. compressor costs, it doesn't really make financial sense to rebuild anything anymore.

    I also can't help but think the industry went in this direction due to the evaporating industry talent along with an inability to fill that void with new "talent" which has resulted in the industry filling those voids with what I'll call, some not so great "talent".

    What's say You guys?

  14. #12
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
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    Rebuilding compressors in the field still has its place. In some cases, such as tight tolerances, it can not be done reliably or allow for an efficient compressor operation.
    Don't step on my favorite part of the Constitution just to point out your favorite part.

    Political Correctness is forced on you because you have forgotten decency.

    Technically speaking, they are all heat pumps.

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