Page 1 of 4 1234 LastLast
Results 1 to 13 of 51
  1. #1
    Join Date
    Apr 2001
    Location
    Over Here
    Posts
    1,105

    R-410A heat pump compressors 'de-coupling' during heat operation

    Hi - Been a while since I posted here.

    I am an HVAC contractor and am noticing a pattern with several R-410A compressors in (less than one year old) heat pump systems we've installed. After a cold night, I'll get a call from someone saying their outside unit is noisey and system is not heating.

    What I see when I arrive is the compressor is running, but not pumping as pressures are equalized. Somehow the motor has 'de-coupled' from the mechanical assembly internally. It is not the same internal relief sound normally heard in R-22 based compressors.

    Turning off the compressor for a day gives it time to cool down (or catch up with itself), then it operates normally again.

    Anyone else experienced this? What causes this? Reversing valve sticking in mid-position? Long defrost cycle resulting in high head pressure?

    BTW, these are Goodman units with Copeland scrolls. So far, have only seen this with 2.5 ton units.
    Last edited by thermojohn; 01-24-2011 at 04:28 PM. Reason: Add more info.

  2. #2
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,018
    probably sticking rev valve

  3. #3
    Join Date
    Sep 2009
    Posts
    382
    There's a Goodman recall on this, that might be it.

  4. #4
    Join Date
    Apr 2001
    Location
    Over Here
    Posts
    1,105
    Quote Originally Posted by seanddd View Post
    There's a Goodman recall on this, that might be it.
    Really? What kind of recall?

  5. #5
    Join Date
    Sep 2009
    Posts
    382
    SR-036 and SR-041. You can search for old discussion
    threads in this forum.

    Quote Originally Posted by thermojohn View Post
    Really? What kind of recall?

  6. #6
    Join Date
    Jan 2011
    Location
    TN
    Posts
    93
    had same kind of problems RV's been sticking.goodman did have recall on "Danun" valves I think i got name right they are junk.had one just month ago screwed on gauges with compressor running pressures were equal and compressor sounded rough. got to checking and the valve was stuck

  7. #7
    Join Date
    Jan 2010
    Posts
    6,095
    [QUOTE=thermojohn;9151851] Somehow the motor has 'de-coupled' from the mechanical assembly internally. Copeland scrolls.

    I don't think that is possible and then work again.

  8. #8
    Join Date
    Apr 2001
    Location
    Over Here
    Posts
    1,105
    OK - Now we're getting somewhere. Danged ol' Chinese reversing valves. Looks like the imprint of a flower embossed on the valve. Don't know the brand.

    Thank you for responding everyone. Anyone else have any problems with these?

  9. #9
    Join Date
    Dec 2005
    Posts
    1,908
    Quote Originally Posted by thermojohn View Post
    OK - Now we're getting somewhere. Danged ol' Chinese reversing valves. Looks like the imprint of a flower embossed on the valve. Don't know the brand.

    Thank you for responding everyone. Anyone else have any problems with these?
    Before we are all shooting down those chinese this chinese that R-valve, read EVERY word on the side of the compressor. The answer is there. Too many compressor and R-valve have been changed for no reason. Except it does not speak the native tongue.

    Sorry, I cannot give further information. I have to treat you as DYI.

  10. #10
    Join Date
    Apr 2001
    Location
    Over Here
    Posts
    1,105
    Quote Originally Posted by VTP99 View Post
    I don't think that is possible and then work again.
    I hear ya. I've experienced this twice, though. Sounds like only the motor is running (like a sheared shaft). It might have been operating through the 'stuck in mid position' valve, but usually I'll hear the whooshing sound of gas going through the valve if it is stuck in mid position. That was not happening the times I've experienced this. Give the compressor time to cool, and restart it and it operates like nothing ever happened.

    I do not know how the shaft is connected to the motor internally. I was thinking like a magnetic drive to protect the compressor from high pressure or something. Only seen this with R-410 compressor and not R-22 types.

    I'm all ears if you know something about this.

  11. #11
    Join Date
    Sep 2009
    Posts
    382
    internal relief?

    Quote Originally Posted by thermojohn View Post
    I hear ya. I've experienced this twice, though. Sounds like only the motor is running (like a sheared shaft). It might have been operating through the 'stuck in mid position' valve, but usually I'll hear the whooshing sound of gas going through the valve if it is stuck in mid position. That was not happening the times I've experienced this. Give the compressor time to cool, and restart it and it operates like nothing ever happened.

    I do not know how the shaft is connected to the motor internally. I was thinking like a magnetic drive to protect the compressor from high pressure or something. Only seen this with R-410 compressor and not R-22 types.

    I'm all ears if you know something about this.

  12. #12
    Join Date
    Apr 2001
    Location
    Over Here
    Posts
    1,105
    Quote Originally Posted by just_opinion View Post
    Before we are all shooting down those chinese this chinese that R-valve, read EVERY word on the side of the compressor. The answer is there. Too many compressor and R-valve have been changed for no reason. Except it does not speak the native tongue.

    Sorry, I cannot give further information. I have to treat you as DYI.
    I am a licensed contractor and not DIY. Do I need to post in the pro section to get the real scoop? It has been a long time since I've posted here at HVAC Talk. A lot of changes have taken place here since.

  13. #13
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,929
    You've got the post count for sure, so apply for pro membership and it gives you access to the educational forum as well.

Page 1 of 4 1234 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event