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Thread: ICOR Nu 22

  1. #1
    Join Date
    Aug 2007
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    Question ICOR Nu 22

    Any one out there using ICOR's Nu 22? I am just wondering if it is effective in replacing R-22 and being used in the commercial refrigeration industry.

  2. #2
    Join Date
    Jan 2001
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    So.Cal
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    Have never used this refrigerant but ran into a Bakery that converted to Nu-22. They had an oil return problem.

  3. #3
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    Sep 2008
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    I've seen 422d, but not 422b (Nu-22).

    Oil return problems with that stuff are the least of the worries.

    I swear it eats o-rings and seals.

  4. #4
    Join Date
    Jul 2000
    Location
    Guayaquil EC
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    R422A, R422B and R422D typically shrink elastomeric O-rings and seals which have swelled a bit from the original R22.....they don't "eat" them

    Here's a short thread with an answer from RobY on the subject:
    http://hvac-talk.com/vbb/showthread....ighlight=seals

  5. #5
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    Sep 2008
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    Western PA
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    Technically correct.

    I have never done much post-mortem exam on the parts I have replaced on those systems.

    End result is the same, isn't it? Leaks after leaks after leaks...

  6. #6
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    Nov 2000
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    Memphis TN USA
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    Quote Originally Posted by jpsmith1cm View Post
    I've seen 422d, but not 422b (Nu-22).

    Oil return problems with that stuff are the least of the worries.

    I swear it eats o-rings and seals.
    Manufactors data says to change the seals.
    If the superheat ain't right it ain't charged right.

  7. #7
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    Sep 2008
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    We did all the serviceable seals. Schraeders and caps, EPRs etc. Still have TONS of leaks.

    Some seals cannot be changed easily

  8. #8
    Join Date
    Mar 2008
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    Banana Republic,Florida
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    Quote Originally Posted by jpsmith1cm View Post
    We did all the serviceable seals. Schraeders and caps, EPRs etc. Still have TONS of leaks.

    Some seals cannot be changed easily
    thats why my company offers a full rehaul when ever we do that type of a job to prevent a problem down the road replace all the valve,gaskets to all the suction and discharge and oil pots etc cause they all start to leak after 1-2 months
    Mastic its whats for dinner!

  9. #9
    Join Date
    Feb 2004
    Location
    Medford Oregon
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    807
    R-407C much better, it does require an oil change to POE, other than that it's almost a drop in and cheaper than Icor Junk (R422), plus approved by all Compressor mfrs.

  10. #10
    Join Date
    Nov 2005
    Posts
    386
    So what really makes these gaskets and seals leak? Is it old oil or refrigerant in the system that mixes with this new stuff? the bulliten at dupont doesn't really give a ture explanation. they just advise you to change out above mentioned.

  11. #11
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    Sep 2008
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    Western PA
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    Quote Originally Posted by icemeister View Post
    R422A, R422B and R422D typically shrink elastomeric O-rings and seals which have swelled a bit from the original R22.....they don't "eat" them

    Here's a short thread with an answer from RobY on the subject:
    http://hvac-talk.com/vbb/showthread....ighlight=seals
    Answer is here.

  12. #12
    Join Date
    Nov 2005
    Posts
    386
    I love answers

  13. #13
    Join Date
    Dec 2006
    Location
    Goodyear, AZ
    Posts
    197

    Oil return

    If a system cannot maintain at least a minim velocity of 1500 fpm to 1850 fpm in the suction line the mineral oil will have a oil return problem with a HFC refrigerant. In an R-22 retrofit to R-407C, R-22C or R-22D that falls below that 1500 fpm will have to have the oil changed to Ester oil. So if a compressor unload or an system cannot maintain the velocity will have oil return problem.

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