R-22 TO 407C
Page 1 of 3 123 LastLast
Results 1 to 13 of 34

Thread: R-22 TO 407C

  1. #1
    Join Date
    Dec 2009
    Location
    Fort Worth, Texas
    Posts
    150

    R-22 TO 407C

    I am working on a ycas0330 York screw chiller. Has any one converted over to 407c.
    TXV is 22 or 407c. Anything need to done out of the ordinary. Thanks for any help

  2. #2
    Join Date
    Feb 2010
    Location
    Calgary, Alberta
    Posts
    1,078
    I think the oil needs to be changed to POE.
    And you're gonna lose capacity!

  3. #3
    Join Date
    Aug 2012
    Location
    Tennessee
    Posts
    67
    Oil change/flush is required. Use ISCEON MO99. Only need replace driers and shredder valve cores. Pressures very similar
    2nd generation commercial technician

  4. #4
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,334
    With a change like this, you'll need to change all of the o-rings in the system in addition to the oil change that is required.

    R-22 causes the o-rings to swell up and the R-407c doesn't. The lack of that "swelling factor" causes the o-rings to try to revert to their original size. If they've been in for any length of time, they'll leak REAL bad.

    You may want to check with the manufacturer, but this is a common component of this change-out.

  5. #5
    Join Date
    Dec 2009
    Location
    Fort Worth, Texas
    Posts
    150
    system is already poe. i knew that you would lose capacity, but manufacture said that you could freeze up the cooler barrel ? Wondering if anyone has done this to a ycas.

  6. #6
    Join Date
    Dec 2008
    Location
    Dixiana, AL
    Posts
    2,609
    I can tell you that the R22 barrels are 4 pass refrigerant and the R407C barrels are 1 pass on the YCAS's. Not positive about the reasoning for the difference. Probably has to do with oil return or refrigerant density/thermal property characteristics. I can't hardly see that you'd freeze a barrel doing this. I'd have to see some empirical data that showed why it was possible.

    I know some folks have used Isceon MO99 in the DX chillers and had reasonable success with it, and it's a blend, also. If you do the job, let us know if it works. Probably open some doors for us all.

  7. #7
    Join Date
    Dec 2009
    Location
    Fort Worth, Texas
    Posts
    150
    The reason for the change was to lower the expense of r-22. MO99 is also expensive. From what I am hearing true or false ? Looks a little risky. I believe I will just keep on going with what I have.

    Thanks for all the input.

  8. #8
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,222
    so you are changing it because R22 is to expensive? are you losing a lot of refrigerant? you should not be losing much. perhaps the money should be spent on figuring out why it is leaking so much and fix that part.

    if you convert it, all of the old problems and any new ones will all be yours even if those old problems are not your fault.
    You either love bacon or you are wrong.

    4 gallons of gas, 2 miles of travel, teaching my daughters how to drive in the high school parking lot...priceless!

  9. #9
    Join Date
    Nov 2004
    Location
    up in the hizzy
    Posts
    1,375
    So how it go? one of my clients wants to change an RTAA to 407c, we are in the middle of ironing the process, my plan is to leave the mineral oil in and monitor the results, the oil separator should return 98% of the oil back to the compressor, time will tell if the rest of the oil comes back or logs in the evaporator, I'm looking forward to do the job.

  10. #10
    you are going to create more problems in my opinion. you will not be able to get 100% of the oil removed that will be required to change to poe. that along with capacity decrease and orings that will leak should make you think twice.

  11. #11
    Join Date
    Jun 2013
    Location
    Central Florida
    Posts
    451
    I am unaware if the manufacturers have changed their tune, but back in the early 90's it was stated that oil logging was a potential problem in LOW TEMP applications.

    I personally agree with the 407C, but strongly suggest POE oil change if possible.

  12. #12
    Join Date
    Nov 2004
    Location
    up in the hizzy
    Posts
    1,375
    I converted the RTAA to 407c without changing the oil, its been running without problems for over a month.

  13. #13
    Join Date
    Sep 2011
    Location
    Northwest Louisiana
    Posts
    272
    York produced several YCAS units that was shipped with 407c. The only differences I remember seeing was they had a liquid line to suction line heat exchanger, The micro-processor has option built into it to run on either R22 or R407c with just a push of the button. If circumstances warranted it I wouldn't hesitant to convert to R407 including a couple of oil changes.
    A LITTLE BIT OF STUPID GOES A LONG WAY!

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
  •  
Comfortech Show Promo Image

Related Forums

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