MO99 and semi hermetics
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  1. #1
    Join Date
    Jul 2012
    Location
    Chicago, IL
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    20

    MO99 and semi hermetics

    Anybody tried this conversion from r22 to MO99 yet on a semi hermetic?? Carrier M# 48EJE034-610DB
    Ive talked to Carrier and they tell me it can only be done by their techs for commercial equipment as of now and isnt for field use yet for commercial equipment. I understand we have to replace the driers, shrader cores and gaskets and this is the replacement that carrier is backing so far. Any input??

  2. #2
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
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    3,699
    Go to a supplier that peddles DuPont refrigerants and ask them . I see no issues with it.

  3. #3
    Join Date
    Jul 2012
    Location
    Richland, WA
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    248
    On the the stores that we take care of has a semi on the walkin cooler that is running MO99 and not having problems. Been there for a year now.


    Sent from my iPhone using Tapatalk

  4. #4
    Join Date
    Jul 2012
    Location
    Chicago, IL
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    Quote Originally Posted by caheiman30 View Post
    On the the stores that we take care of has a semi on the walkin cooler that is running MO99 and not having problems. Been there for a year now.


    Sent from my iPhone using Tapatalk
    Did you change anything special on the semi besides schraders, driers, suction and discharge gaskets when you were doing the conversion?

    Sent from my iPad using Tapatalk HD

  5. #5
    Join Date
    Jul 2012
    Location
    Richland, WA
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    248
    Quote Originally Posted by MsiHvac View Post
    Did you change anything special on the semi besides schraders, driers, suction and discharge gaskets when you were doing the conversion?

    Sent from my iPad using Tapatalk HD
    Nope.


    Sent from my iPhone using Tapatalk

  6. #6
    Join Date
    Jul 2012
    Location
    Richland, WA
    Posts
    248
    Have a total of 6 systems with MO99 in it, 1 walkin cooler, 1 trane RTU AC, and 4 York RTU AC's. always just changed out the drier, schraders, and flushed the system every direction possible with nitrogen, to get as clean as possible in the coils.


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  7. #7
    Join Date
    Jul 2012
    Location
    Chicago, IL
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    Thanks guys!!

  8. #8
    Join Date
    Sep 2011
    Location
    BC, Canada
    Posts
    34
    Heres a link to duponts pdf on retrofitting with mo99 http://www2.dupont.com/ISCEON/en_US/...guidelines.pdf

    I also spoke with a dupont rep at a recent trade show and was told that only issues they know about is the slight capacity loss with mo99 compared to r22 so in systems that were poorly designed and were borderline undersized there could potentially be issues.

  9. #9
    Join Date
    Jun 2003
    Location
    Chicago, IL
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    4,306
    Quote Originally Posted by MsiHvac View Post

    Did you change anything special on the semi besides schraders, driers, suction and discharge gaskets when you were doing the conversion?

    Sent from my iPad using Tapatalk HD
    You do not need to change any fiber or metal gaskets. Only rubber ones

  10. #10
    Join Date
    Jul 2012
    Location
    Chicago, IL
    Posts
    20
    Thats right, because the rubber ones swell with r22 and dont with MO99 if im not mistaken.

  11. #11
    Join Date
    Nov 2003
    Location
    Montreal, Qc.
    Posts
    775
    Has anyone needed to replace semi hermetic service valves due to leaks?
    I have a Carrier 52 ton which has an empty circuit due to a leak on the distributor.
    I don't want to trade one problem for another.
    It serves operating rooms for a few dentists and I can't afford the downtime.

    I may just go with R-22 on this one.

  12. #12
    Join Date
    Nov 2004
    Location
    up in the hizzy
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    1,375
    Quote Originally Posted by thump_rrr View Post
    Has anyone needed to replace semi hermetic service valves due to leaks?
    I have a Carrier 52 ton which has an empty circuit due to a leak on the distributor.
    I don't want to trade one problem for another.
    It serves operating rooms for a few dentists and I can't afford the downtime.

    I may just go with R-22 on this one.
    I've replaced leaky service valves a few times, in some cases the valve could be re-packed.
    The instructions tell us to loosen the packing nut every time we use the valve, about 99.9% of us ignore it.
    As far as MO99 goes, I wouldn't use it in anything other that a junk unit on its way out.

  13. #13
    Join Date
    May 2013
    Posts
    119
    we just had a class put on by DuPont about mo99. i haven't used it yet but with the lower discharge temps i think it is a better option than 22. i never understood when people get hesitant about using a new refrigerant, there are tons of blends.

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