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  1. #1
    I am requesting info on what y'all did for replacing R502 in low temp applications.

    Please list the refrigerant blend you switched over to, the oil you used and and issues you discovered in the process.

    Thank you

  2. #2
    Join Date
    Dec 2002
    Location
    peoples republic of maryland
    Posts
    956
    R-404a, R-408a. POE. Works well, never a retro, only new installation.
    "The meek shall inherit the earth"
    "he that's walking with wise persons will become wise, but he that is having dealings with the stupid ones will fare badly" Proverbs 13:20
    "Pressure is something people feel when they don't know what their doing". Peyton Manning-superbowl MVP

  3. #3
    Join Date
    Apr 2001
    Location
    Camel City, NC
    Posts
    6,233

    Retro 502

    HP 80 and ABO. No problems yet.
    Be safe not fast. body parts don't grow back

  4. #4
    Join Date
    May 2004
    Posts
    13
    For drop in's... HP80, sometimes HP81 for Ice machines. On larger stuff, I always do an oil change to POE and use either 404a or 507. I prefer 507 but most manufactures are using 404.

  5. #5
    Join Date
    Dec 2000
    Location
    oklahoma
    Posts
    85
    Like selfemployed, HP 80 and ABO. No problems ,has been changed over for several years.

  6. #6
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,318

    R502 retofits...........

    I'll try not to repeat myself from my R12 retrofit reply, but here goes.....

    DuPont's offerings for an "interim replacement service refrigerant" were basically HP80 (R402A) and HP81 (R402B). Whereas the HP81 was primarily for Manitowoc B-Series icemakers intending to achieve a higher discharge temperature for harvest than HP80, I'll just leave that one alone.

    HP80 has been a very good refrigerant. It's application, like MP39 initially required a minimum 50% AB/MO mix, but that was dropped later on for all but those systems with oil return issues.

    The only bad experience I've had with HP-80 is one where the system had a slow leak on the LP control bellows and the refrigerant fractionated to the point where when the system was topped off the head pressure went through the roof. Pulling the charge, evacuating and recharging with fresh juice and all was well again.

    As I said in the R12 retro thread, it's now come time that we have to look at each system for HFC retrofit more so than the HCFCs like HP80, et al. Let's face it, there haven't been any R502 systems made in well over ten years, and even those are getting a bit long in the tooth.

  7. #7
    Originally posted by polartech
    For drop in's... HP80, sometimes HP81 for Ice machines. On larger stuff, I always do an oil change to POE and use either 404a or 507. I prefer 507 but most manufactures are using 404.
    Hey Polar, why do you prefer 507?



  8. #8
    Join Date
    May 2004
    Posts
    13
    R12,
    I don't know really. From what i understand 404a is a slightly better refrigerant. Compression ratios, I'm going to get trouble for that , are a little lower and the enthalpy (at -20) is a little higher. I don't know how the discharge temps relate, and I haven't taken both gases to the Pressure-Enthalpy diagram to know for sure. 507 was just what we started using here first. The other thing that's nice with 507... no glide.



  9. #9
    Join Date
    Sep 2001
    Location
    East Stroudsburg, PA
    Posts
    13,215

    Red face

    404A, POE. Are you surprised????????????


  10. #10
    Originally posted by condenseddave
    404A, POE. Are you surprised????????????

    Nope




  11. #11
    Join Date
    Dec 2004
    Location
    NYC
    Posts
    8
    [QUOTE]Originally posted by R12rules
    I am requesting info on what y'all did for replacing R502 in low temp applications.

    Please list the refrigerant blend you switched over to, the oil you used and and issues you discovered in the process.

    Thank you
    [/QUOTE


    Hi 404 is my best working methood

  12. #12
    Join Date
    Dec 2004
    Location
    NYC
    Posts
    8
    [QUOTE]Originally posted by freezingair
    Originally posted by R12rules
    I am requesting info on what y'all did for replacing R502 in low temp applications.

    Please list the refrigerant blend you switched over to, the oil you used and and issues you discovered in the process.

    Thank you
    [/QUOTE


    Hi 404 is my best working methood
    in emerangcy cases 408 works wonder till -15

  13. #13
    Originally posted by freezingair

    Hi 404 is my best working methood
    in emerangcy cases 408 works wonder till -15 [/B]
    Thanks.


    genman ... is this helping you? got a good idea now on what the scoop is?


    I can dig up some old threads argueing the finer points of this. Let me know.

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