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What to replace R-22 with AB oil in compressor......walk in cooler

Butcher shop has a walk in cooler "bone" room....actually gut room....inside copper coil deteriorates from methane and ammonia gases of cow/pig guts IMO. (Cow & pig farts destroying the world BTW). Cooler full of barrels is emptied once a week.

12 year old coil has numerous leaks. Is currently R-22 system.
Compressor has AB oil. With change of TXV and new coil what gas could be used in this system for 40 degree operation. 6600 btu coil.....comp is RST55 C1 CAV-959 with 15 oz of AB oil.

Looking for less expensive gas as the new coil will start to leak within 10 years.


  • Ironman
    Ironman Member Posts: 7,399
    Here are a couple of charts that list the compatibility of AB oil and R22 replacements:

    This is what Copeland approves.

    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • pecmsg
    pecmsg Member Posts: 4,967
    Fix the leaks.
    Dump the AB and refill with POE
    Change the x-valve
    Install a suction filter for a day or 2
    Refill with R-404A
    JUGHNE Member Posts: 11,110
    Thank you to all.
    A new coil and TXV will take care of the obvious leaks.
    I will go back with R-22. It takes less than 7 LBS.
    This will be the quickest and most economical repair.

    The owner is 74 and would like to just lock the door.
    He has plenty of business; booked solid to march of 2021 and has bookings into Dec of 2021.
    The Covid has driven up the price of beef in the retail stores as the shortage of USDA processing output has gone down. (either real or created) so the rancher prices has gone down.
    People buy direct and have the processing done.
    Our last grass fed whole beef lasted my wife and I for 2 years.
    We just got the next one into the freezer.
    All butcher shops here who do kill/processing are booked up the same. Many are for sale. Too much work for most people.
    Hard to find good help....as of today NE has the lowest unemployment in the country...before Covid we were 3 or 4.

    Just to point out that the original coil went about 30 years with minimal leakage. The present leaker was installed 7 years ago.
    Perhaps thinner tubing in newer coils?

    Talking to another guy in the trade, he says the same problem in gut rooms and has spray painted the coil end return tubes that might get one a couple of years.....anyone else tried this??

    Thanks for all inputs.
    EBEBRATT-Ed Member Posts: 15,844
    You can get coils coated from the MFG. for extra$$
    JUGHNE Member Posts: 11,110
    Thanks ED, coated to protect against methane and ammonia?
  • mattmia2
    mattmia2 Member Posts: 9,970
    Aren't there manufacturers that will make you custom coils out of what they used 30 years ago, although that may cost more than replacing it again, but the loss of product might be far more than the cost of the equipment.
    JUGHNE Member Posts: 11,110
    You have to understand that there is no product to lose in the gut room......just the ripe smell and flies.
    Barrels full of guts and other unmentionables waiting for the pick up by the rendering truck.

    The cooler quit earlier this week. I could smell the result 1 block south of the box. Familiar with the situation, would have been a good time to be out of town and hand the job off to someone else.
    EBEBRATT-Ed Member Posts: 15,844

    I know we used coated coils in some applications...............not sure about your application. Have to inquire with a coil manufacturer. They use coils in sewage treatment plants that have the same issues