Page 1 of 3 123 LastLast
Results 1 to 13 of 36
  1. #1
    Join Date
    Jul 2008
    Location
    Nova-Scotia, Canada
    Posts
    453
    Post Likes

    Another 407c loss thread!

    So let's say through a chain of very unfortunate events the relief blew on a split system receiver with just shy of 220 lbs of 407c. Even though the relief was on the vapour space, at this point (probably 450 psi and A common temperature), do you think the charge has suffered any significant fractionation? I do need to pull the charge as guessing how much to put in these is nothing more than that ( designed for -40 ambient operation). I'll know how much I lost when I recover the charge. I've read pretty extensively on the whole replace charge/top up. It seems to be a 50/50 split opinion wise. I guess at this point of the cycle, would the refrigerants have still exited left stage in proportional amounts?

  2. #2
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    22,944
    Post Likes
    When you recover the charge compare the pressure to the temp.
    As far as when to top off check with the manfacture.

  3. #3
    Join Date
    May 2014
    Location
    Bay Area California
    Posts
    23,088
    Post Likes
    Was a torch involved?

  4. Likes washer liked this post
  5. #4
    Join Date
    Jan 2010
    Location
    Sea to Sky
    Posts
    3,205
    Post Likes
    Recover charge. Recharge liquid only. Top off with virgin R407C.

    Sent from my SM-N910W8 using Tapatalk

  6. Likes PowellSixO liked this post
  7. #5
    Join Date
    Jul 2008
    Location
    Nova-Scotia, Canada
    Posts
    453
    Post Likes
    Thread Starter
    Quote Originally Posted by BBeerme View Post
    Was a torch involved?
    No. Engineering's interconnecting wiring schedule had the last circuit run enable wired across the high pressure control in Lou of the auxiliary contact on compressor (pump out circuit). High pressure controls were factory set at 400 and maxed out, discharge transducers for circuit 3 and four polarities were backwards and switched. When the wires are open it was giving Plc full scale value forcing the fans on. When I reversed polarity and corrected it while the system was running it then shut the fans off (seeing number there's idle head pressure and mistaking it for four). While the hp control was bypassed the second isolated contacts give the plc a fault. The delay between the hp contacts to plc to initiate a failure and drop out the enables was just enough time to blow the relief valve. The compressors shut off and within a second the relief valve let go.

  8. #6
    Join Date
    Mar 2015
    Location
    Medford, N.Y.
    Posts
    5,551
    Post Likes
    What was the 450psi in the OP in reference to?

  9. Likes nathankerr liked this post
  10. #7
    Join Date
    Jan 2010
    Location
    Sea to Sky
    Posts
    3,205
    Post Likes
    Quote Originally Posted by BALloyd View Post
    Recover charge. Recharge liquid only. Top off with virgin R407C.

    Sent from my SM-N910W8 using Tapatalk
    Thinking about this some more it may not work. I was thinking along the lines of getting non-condensibles out. If it was fractionated badly enough, it may still affect performance.

    Sent from my SM-N910W8 using Tapatalk

  11. #8
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    17,082
    Post Likes
    I'd probably re use it if you didn't lose more than 25% of the charge. More than 25-30% and I'd go back with all Virgin. It's cheap insurance for what 407c costs per drum.

  12. Likes HellGato, nathankerr liked this post
  13. #9
    Join Date
    Jul 2008
    Location
    Nova-Scotia, Canada
    Posts
    453
    Post Likes
    Thread Starter
    Quote Originally Posted by TechmanTerry View Post
    What was the 450psi in the OP in reference to?
    The relief setting

  14. #10
    Join Date
    Jul 2008
    Location
    Nova-Scotia, Canada
    Posts
    453
    Post Likes
    Thread Starter
    Quote Originally Posted by BALloyd View Post
    Thinking about this some more it may not work. I was thinking along the lines of getting non-condensibles out. If it was fractionated badly enough, it may still affect performance.

    Sent from my SM-N910W8 using Tapatalk
    Non condensibles? The system was evacuated to under 500 microns and charged. Non condensibles never made their way into the system

  15. Likes HellGato liked this post
  16. #11
    Join Date
    Jul 2014
    Location
    Apache Junction, Arizona
    Posts
    1,132
    Post Likes
    Quote Originally Posted by Armament View Post
    Non condensibles? The system was evacuated to under 500 microns and charged. Non condensibles never made their way into the system
    I tend to agree. a loss due to pressure relief is not a vacuum allowing any noncondensables to enter the system..
    "I never lie because I don't fear anyone. You only lie when you're afraid." - John Gotti

    “Always shoot first . . . that way they know you’re armed!” - Orrin Porter Rockwell

    "Individuals and entities performing contracting work illegally and without a license place the public at risk and effectively steal millions from Arizona's hardworking, law-abiding contractors and their employees," - Jeff Fleetham, director of the Arizona Registrar of Contractors.

  17. Likes hedrash liked this post
  18. #12
    Join Date
    Sep 2006
    Location
    Ohio
    Posts
    740
    Post Likes
    Charge with new 407c.

  19. #13
    Join Date
    Dec 2012
    Location
    columbus, OH
    Posts
    6,790
    Post Likes
    I think phm knows what to do depending on weather it needs calmed down or hyped up

Page 1 of 3 123 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
  •