Page 1 of 2 12 LastLast
Results 1 to 13 of 19
  1. #1
    Join Date
    May 2005
    Posts
    1,624
    Post Likes

    Whats the superheat on a scroll compressor??

    Im getting ready to replace a 3 month old compressor , the last one has the same symptoms (it went over a year)
    as this one…It seems like its flooded back and took the bearings out..but I checked superheat
    1.2 dozen times after the 2nd compressor.
    The TXV is good, I can get any superheat I need.

    Water cooled system..and its a walk in freezer.
    Let's give nukes a chance.

  2. #2
    Join Date
    Dec 2014
    Location
    In my truck, driving
    Posts
    1,079
    Post Likes
    On a scroll the lower the better but be sure you have no flooding. I use an electronic sight glass to make it easy. But less than 5 is risky.

  3. #3
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    26,211
    Post Likes
    20 - 40 at the pump
    Discharge below 175

  4. #4
    Join Date
    May 2005
    Posts
    1,624
    Post Likes
    Thread Starter
    Well I set it at 25* give or take a couple, and its toast…..discharge was around 175 as well….Im wore out on this one..

    going to go get a replacement compressor tuesday…hope something clicks.
    Let's give nukes a chance.

  5. #5
    Join Date
    Mar 2007
    Posts
    3,641
    Post Likes
    Off cycle migration? I know you said it's a WI freezer, so maybe this is not as much of an issue. Oil heater working?
    The key to happiness is lower expectations.

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

  6. #6
    Join Date
    May 2005
    Posts
    1,624
    Post Likes
    Thread Starter
    The system is in a warm underground area..
    Let's give nukes a chance.

  7. #7
    Join Date
    Jul 2000
    Location
    Guayaquil, EC
    Posts
    14,308
    Post Likes
    Is this set up for pumpdown? For both the off-cycle and for defrost? Is the low pressure control sticking closed? Did you replace the contactor? How's the oil level? (I assume it has an oil SG)

  8. #8
    Join Date
    Sep 2002
    Posts
    17,050
    Post Likes
    Quote Originally Posted by primmers View Post
    The system is in a warm underground area..
    That does not mean much!

  9. #9
    Join Date
    May 2005
    Posts
    1,624
    Post Likes
    Thread Starter
    icemeister, Yes it pumps down, on both…the low pressure control is electric controller that does it all…No, i didnt replace the contractor, but will be eyeballing it tonight when I remove the compressor..

    theres no sight glass on the compressor..

    coolpeferfect, now that I think of it theres a heater on the system..
    Let's give nukes a chance.

  10. #10
    Join Date
    May 2005
    Posts
    1,624
    Post Likes
    Thread Starter
    I read a piece on compressor super heat and it called for 40*……said you couldn't flood the compressor at that temp..
    Let's give nukes a chance.

  11. #11
    Join Date
    Jul 2000
    Location
    Guayaquil, EC
    Posts
    14,308
    Post Likes
    Quote Originally Posted by primmers View Post
    icemeister, Yes it pumps down, on both…the low pressure control is electric controller that does it all…No, i didnt replace the contractor, but will be eyeballing it tonight when I remove the compressor..

    theres no sight glass on the compressor...
    Since it's a pumpdown control, there no migration issue.

    What model is the compressor? Is Copeland not putting SG's on refrigeration scrolls now?

    It's good practice to replace the contactor with every compressor change. Cheap insurance.

  12. #12
    Join Date
    Dec 2014
    Location
    In my truck, driving
    Posts
    1,079
    Post Likes
    How about the suction line, is it well insulated?

  13. #13
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    26,211
    Post Likes
    2nd on in 15 months request a tear down and find exactly what happened.

    I assume R-404A

    MOP x-valve?

    Could just be It Happins!

Page 1 of 2 12 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
  •