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  1. #1

    502 drop in replacement

    Is 408a a drop in for 502

  2. #2
    Join Date
    Jan 2008
    Location
    LEHIGH VALLEY, PA
    Posts
    162
    yes 408A is used as a replacement for 502 systems , cant mix the 2 gasses

  3. #3
    We have a tech on call and he has has a walkin that is flat with 502 on the txv and no other markings. We are trying to get them up and running tonite

  4. #4
    Thanks for the reply hope we can get them going

  5. #5
    Join Date
    Aug 2004
    Location
    Tucson, Az
    Posts
    337
    Hope it worked out for you.

    If running mineral oil you may run in to an issue.
    Jim
    Tucson, Az
    Keeping the Ice Cream Frozen!

  6. #6
    Join Date
    May 2013
    Location
    Utah
    Posts
    57
    MO-79, R-422A is worth looking into.
    We are having good success with MO-59 for R-22 sub on a similar note.
    Otherwise HP-80 is the best older substitute.

  7. #7
    Trouble is having the right jug on the truck. He found the leak on a solenoid valve so he had to go back

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