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R12 replacement

Discussion in 'Refrigeration' started by MNHVAC, Oct 5, 2017.

  1. MNHVAC

    MNHVAC Man on a mission

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    Location:
    MN
    What's the best R12 replacement for a medium temperature capillary tube system and why?
     
  2. Rather B Riding

    Rather B Riding Behind bars

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    I always used 409 but it doesn't always work on cap tube systems. Runs too high head, high amp load on the compressor. I hate hot shot but it does work. 414B I think. There maybe something better by now.
     
  3. coldsnap

    coldsnap -20 on the money

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    4,507
    Location:
    Wisconsin
    We use R420a because the head pressure runs lower than MP39
     
    Texas-Tech and R/HVAC like this.
  4. mike1020

    mike1020 entitled millennial

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    on the roof of target
    They are all crap and for the most part they're all expensive.

    It's a cap tube system that probably holds less than a pound.

    Just put r12 in, you can still get it.
     
    frozensolid and pecmsg like this.
  5. HMD

    HMD does it matter?

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    r11 is cheaper, by 1
     
  6. doc havoc

    doc havoc A cunning linguist

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    It's a Hobart glass door cooler. 4 half doors. Needs a compressor.

    I forgot I have a tank of 12 when I told @MNHVAC to post here.:tard:
     
    jpb2 and knave like this.
  7. MNHVAC

    MNHVAC Man on a mission

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    Location:
    MN
    I think we need to determine its future before proceeding..
     
  8. doc havoc

    doc havoc A cunning linguist

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    I'll get you a compressor to put in it.
     
    knave and MNHVAC like this.
  9. knave

    knave Undeterred

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    8,324
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    NWWI
    If a new compressor, why not 134a?
     
  10. doc havoc

    doc havoc A cunning linguist

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    45.780245, -91.731582
    I don't know. Would the existing cap tube work? I don't want to put any more than I have to into this old beast. It had a new compressor put in back in 2002. Was changed to MP-39 then.
     
  11. mike1020

    mike1020 entitled millennial

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    on the roof of target
    No longer allowed for retrofits
     
  12. knave

    knave Undeterred

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    NWWI
    Looked on epa. Still ok for new, where does it say n/a for retrofit?
     
  13. knave

    knave Undeterred

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    NWWI
    Makes no sense. R12 ok to use. 134a no, no.
    pffft... 134a has 0 ODP, and very low GWP. Doesn’t work that well as a low temp gas but should’ve fine for med.
     
    Zman likes this.
  14. MOFO the psychic gorilla

    MOFO the psychic gorilla sitting on two achers

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    1,944
    Seen posted before 12 doesn't play well with POE but couldn't tell ya if that's true or not.

    I'd say 134 with a new pump but don't know about the rules either :dunno:. Any gas you pick would technically not be compatible with the cap tube size though.

    134 works better than any blend I've used.
     
    knave likes this.
  15. MOFO the psychic gorilla

    MOFO the psychic gorilla sitting on two achers

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    1,944
    How bout 410 and a AXV :popcorn:
     
    Texas-Tech likes this.
  16. frozensolid

    frozensolid Psychologist's Dream

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    Earth
    And its relatively cheap and headache free.
     
  17. coldsnap

    coldsnap -20 on the money

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    Location:
    Wisconsin
    Where does it say that?
     
  18. Rather B Riding

    Rather B Riding Behind bars

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    616
    Is this for a customer? R12 units are at least 25 years old. It had a compressor failure it 02. It time to let this one go.
     
  19. MOFO the psychic gorilla

    MOFO the psychic gorilla sitting on two achers

    Messages:
    1,944
  20. doc havoc

    doc havoc A cunning linguist

    Messages:
    9,524
    Location:
    45.780245, -91.731582
    Not for a customer. School is throwing it away so I thought what the hell. If I can get a compressor for $130 it will be a good experience for MNHVAC. He already diagnosed the faulty windings. The condenser is packed with grease and dust. We'll clean it up and maybe sell it for a few hundred.
     
    Rather B Riding, Catpower and knave like this.