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  1. #1
    Join Date
    Jun 2009
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    converting from r12



    just been to my dads pub as he has a walk in fridge in the cellar that was not working. After diagnosing it has having no gas i then leak checked the unit and repaired the leak but found it to be running on r12. should i chrge unit with r134a and will i have to change the expansion valve as it is a danfoss tx2 r12. not up on these fridges as i normally work on trasport stuff. your help would be much appreciated cheers eddie



  2. #2
    Join Date
    Mar 2008
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    United Kingdom
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    Re: converting from r12

    You can get R409a as a drop in replacement for R12 with no changes. A long term soloution would be R134a but yes you would have to change the TEV and also change the oil and flush the system. Hope this helps

  3. #3
    Join Date
    Jun 2008
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    gloucester
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    Re: converting from r12

    you could try r413a, make sure you change the drier. hope this helps, make sure you vac out before charging

  4. #4
    Join Date
    Dec 2004
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    U.K
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    Re: converting from r12

    I tend to use R413A as well, or sometimes called isceon 49.

    works good as a drop in, might have to adjust the superheat a bit, generally charge 10% less than recommended charge and expect flashing in the sight glass.

  5. #5
    hot chilly's Avatar
    hot chilly Guest

    Re: converting from r12

    best choice is the long term retrofit with r134a and poe oil but this takes time and about 3-4 oil changes to get less than 5% mineral oil in the mix also have to change expantion device and dryer

  6. #6
    Dieppert's Avatar
    Dieppert Guest

    Re: converting from r12

    I have converted many systems from r-12 to 134a, as mentioned above you must change the oil to POE, and change the oil at least 4 to 5 times to get the mineral oil down below the 5 % mark, a refractometer is good for this, it will tell you when your safe , change your driers, POE will break loose particles in the system, as far as your TXV, leave it alone, the same txv will work with the 134a , do check your txv for a removable inlet screen, if so, clean it after system runs a few days, set your super heat

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