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  1. #1
    Join Date
    Oct 2003
    Location
    Minnesota
    Posts
    148

    copelamatic compressor making noise

    Hey guys I'm checking out a Copeland M# ERF1-0310-TAC-218. This compressor serves a walk in cooler. It was holding temp ok and pressures were good. But the customer was complaining ab out the loud almost like tick nouse it was making. I thought maybe one the reed valves starting to go bad. Called local rep. And he agreed. I pulled the head and all looks ok. Any other ideas. Let me know. Thanks.
    Helgy

  2. #2
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Is it a tic or a knock? Pull the oil and check for steel.

  3. #3
    Join Date
    May 2010
    Location
    Oxford, UK
    Posts
    336
    If its spring mounted they can vibrate against then mounting bolts if they are overtightened, springs broke, or rubber buffers worn away.

    If the noise is in the compressor a stethoscope can help track down where its coming from. Does the noise change if the running pressure change?

    When you had the head off, could you feel any play in the rod bearings bearings? Bad valves can lead to wear in the little end bearings as they never unload to allow the oil to get round.

  4. #4
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,066
    on checking for any play. the connecting rod bearings could be starting to get oblong, causing the piston to slightly tap the valve plate.

  5. #5
    Join Date
    Dec 2000
    Location
    Flat Rock, NC
    Posts
    463
    this is copelands largest unit without an oil pump so rod wear at the wrist pin is common w/ age. Have had them last many more years if noise is not an issue.

  6. #6
    Join Date
    Nov 2010
    Location
    Missouri
    Posts
    357
    Also seen where wrist pin would ping against cylinder causing deep grooves.

  7. #7
    Join Date
    May 2010
    Location
    Oxford, UK
    Posts
    336
    Heres a Bristol comp that suffered a conrod failure due to bad valves, you can see the grove worn in the bore that xpuser357 mentions,

    http://www.youtube.com/watch?v=REKsssXhzgk

    You may want to skip the first few minutes, or indeed the whole vid, suit youselves

  8. #8
    Join Date
    Jul 2011
    Location
    Lehigh Valley, PA
    Posts
    436
    I was checking a smaller 1hp semi-hermetic Copeland refr system today with a ticking sound It was dated 1983 and still working. pressures good, cooler down to 36F. I have another with similar set up, the 1hp semi-hermetic Copeland always ticked, always sounded worn out & dead but continued to work until a few months ago. It was dated '79. I wouldn't worry bout it. But a knock is a different issue.

  9. #9
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,403
    I often see ticking and light knocks on these smaller compressors after a low refrigerant incident. When the refrigerant gets low enough, the oil doesn't return properly and the compressor runs out of oil. If the low charge is corrected soon enough, the oil returns and everything goes back to normal before serious damage happens and the only sign it ever happened is the ticking.

    On a tear down, the signs of this is a worn rod on the cylinder farthest from the motor for non-oil pump models, or a worn rod closer to the motor for models with an oil pump.

    if it really is a light ticking I leave it alone. If its gotten to the point of a light or heavy knock, then I put new rods in it. once the rods get bad enough, they'll snap and cause serious damage.

  10. #10
    Join Date
    Mar 2004
    Location
    Las Vegas, Nevada
    Posts
    1,647
    Quote Originally Posted by monkeyspanners View Post
    Heres a Bristol comp that suffered a conrod failure due to bad valves, you can see the grove worn in the bore that xpuser357 mentions,

    http://www.youtube.com/watch?v=REKsssXhzgk

    You may want to skip the first few minutes, or indeed the whole vid, suit youselves
    Nice job on the video. You have WAAAAAAY too much spare time!
    The views and opinions posted here are my own. They do not reflect the corporate policies of my employer and will most likely get me fired at some point.

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