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  1. #1
    Join Date
    Aug 2008
    Location
    Philadelphia
    Posts
    84

    absorber a** kicking

    I have a York M/N YIASTIA2. Its a little machine, however I cannot get it to make range, stop crystallizing, and I never see any evap overflow. It takes FOREVER to load up. Once it loads and makes temp, it backs off and goes into ADC mode. My refrigerant is trashy. I feel overflow as soon as my steam valve opens. I have a clean bill of health from the chemist, I added a half gallon of alcohol, and I have a great vacuum. My flows are in range, and the "engineers" punched the tubes. Here are the numbers:

    Steam: 14.39psia after the valve, 21psia feeding the valve, 230F outlet. Valve at 82% (machine loading)

    Refrigerant: 62F, S.G. 1.12,

    Chilled Water: 64F on, 58 off.

    Condenser: ABS in 81, 87 out, 93 cond out.

    Weak Solution: 97F, S.G. 1.56, 121F to generator.

    Strong Solution: 178F into the HX, 120F out. 1.64 S.G

    The rate limit is set to .5, and the valve pulse is set to 1 minute.

    My main concern is a huge (80f) TD between the strong solution into the HX and the strong solution leaving the HX, I have de-crystallized the machine, but nothing changes.
    I need help!

  2. #2
    Join Date
    Jan 2009
    Location
    Jersey
    Posts
    126
    what is the pressure of the absorber section,

    what is the chilled water setpoint.

    and what is the purge bubble rate?

  3. #3
    Join Date
    Sep 2007
    Location
    Somewhere in the world.
    Posts
    1,618
    I ain't no expert but mabey these IOM's could help you out to figure out your problem they have helped me out tremendously in the past good luck.
    Attached Files Attached Files
    Arguing with your Boss is like wrestling with a pig in
    mud.
    After a while you realize that while you are getting
    dirty, the pig is actually enjoying it.

    It is not exactly cheating, I prefer to consider it
    creative problem solving.

    25 years ago we had Bob Hope , Steve Jobs , and Johnny Cash today we have no Hope no Jobs and no Cash !
    I can fix broke but i can't fix stupid !

  4. #4
    Join Date
    Aug 2008
    Location
    Philadelphia
    Posts
    84
    York56, thank you very much for the books!

    DFZ, the absorber pressure is 7-8 mils, the bubble rate is imperceptible, and the chilled water set point is 45.

  5. #5
    Join Date
    Aug 2000
    Location
    USA
    Posts
    4,995
    Clean your refrigerant up. At 62F with 1.12sg you have about a 15% concentration of solution in your refrigerant. Should be close to 0% solution in your refrigerant. Cut your steam regulater back. Should be around 10PSI at the generater inlet at full load. Relog and post.
    Your poor planning does not constitute an emergency on my part!!!!

  6. #6
    Join Date
    Jan 2009
    Location
    Jersey
    Posts
    126
    absorber section should be about 6mm

    as you clean up the refrigerant the pressure may drop on its own

    it does look to be fouled refrigerant.

    hope all of this is helpfull.

  7. #7
    Join Date
    Aug 2008
    Location
    Philadelphia
    Posts
    84
    Thanks for the help. How do I clean up my refrigerant? My steam is already 3-4 psig below design.

    If I increase the pressure, will I increase the rate of distillation, or will I over concentrate the machine?

  8. #8
    Join Date
    Aug 2000
    Location
    USA
    Posts
    4,995
    Should be a (hand) dump valve on the discharge line of the refrigerant pump that goes into the solution side. Just open it up. It may be 2sol on your machine on page 26 and you may not have a hand valve. Ooops, I see your steam is in PSIA not PSIG. Probably have to log into service mode and go in with 1380 to manually open the dump valve.

    "These solenoid Valves can
    be manually controlled only when “Manual Solenoid
    Control” is selected. Instructions for selecting the desired
    control mode are contained in the IsoFlow Control Center
    “Service” manual, Form 155.16-M3 in “Special Programming
    Procedures” section."
    Last edited by absrbrtek; 05-16-2010 at 11:05 AM.
    Your poor planning does not constitute an emergency on my part!!!!

  9. #9
    Join Date
    Aug 2008
    Location
    Philadelphia
    Posts
    84
    thank you much, absrb! I wired a bypass switch in for 2sol on friday when i tried to decystalize the machine. I guess i didn't leave it on long enough, I was afraid to starve the refrigerant pump. I give it another go on monday, and let you all know how it goes.

    thanks again!

  10. #10
    Join Date
    Aug 2000
    Location
    USA
    Posts
    4,995
    Well???????
    Quote Originally Posted by bullgear420 View Post
    thank you much, absrb! I wired a bypass switch in for 2sol on friday when i tried to decystalize the machine. I guess i didn't leave it on long enough, I was afraid to starve the refrigerant pump. I give it another go on monday, and let you all know how it goes.
    thanks again!
    Your poor planning does not constitute an emergency on my part!!!!

  11. #11
    Join Date
    Aug 2008
    Location
    Philadelphia
    Posts
    84
    It has been cool here on the east coast the week, and the customer has been relying on other means to cool this building. I hope to get out there Friday as we should be having a nice warm day. I will be sure to give a proper update.

    Thank you all again for your help!

  12. #12
    Join Date
    May 2001
    Location
    Western Wa
    Posts
    1,856
    If the machine has a history of leaks, you've got a tiger by the tail.
    I inherited a sick Trane unishell and fought with it for a while, a few years back.
    It had a history of leaks, and you couldn't even see through the sight glass.
    When we scrapped it the solution heat exchanger was so full of crud that it was a wonder it worked at all. Stack up city.


    Abs. is probably the best guy around here on absorbers.
    Listen and learn. He da man.
    God Bless our Veterans

    God Bless the USA

  13. #13
    Join Date
    May 2010
    Location
    Springfield, MO
    Posts
    40

    Carrier 16JB Absorption Chiller Crystallization

    I'm currently fighting a crystallization on a single effect, steam fired 450 ton Carrier 16JB. I'm almost positive it's crystallizing in the lower solution heat exchanger, but I'm running out of ideas and can't get my water below 54 degrees. Any ideas, tricks or suggestions would be much appreciated.

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