Question about Beverage-Air MT27 Beverage Cooler Commercial

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Bev air cooler

I have a mt 27 beverage air cooler. I thing it is a little low on freon. it is a 134a unit. What should the pressures be at 75F degrees atomospheric temp? Thanks Bill Ashbrook

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  • billas Aug 13, 2007

    Thanks solutionGuy.

    I had cleaned the coils. The condenser fan evaporator fan and compressor were all running the temperature in the box was warm.

    This box has had a compressor change and has hi pressure and suction taps. The low side pressure was just about nill and the hig side was 100 psig. I added a litlle 134a and the box began to cool. I just dont know where to set the pressures.

    It calls for a 10oz charge, but it has some in in to begin with so I dont know where I am on the weight.

    I know tha car ACs run about 30 to 36 psig on the suction, and House airs run about 60 to 80 depending on the load on the system.

    I am looking for a ballpark number to set the suction pressure to.

  • billas Aug 13, 2007

    Thanks KOakaKo

    Thats about where I am. I have recovery equipment for 134a and about 80 pounds of new 134a, Sooooo. I would be best off recharging it and the write doun the readings for that temperature.

    Thanks again

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Bill, the main reason I've noticed for higher than normal temps in these boxes is filthy condenser coils (this will affect pressures in your sealed system). Remove the front lower panel and inspect your coils. Use a coil brush or a dust broom to thoroughly clean them up, don't use water. You can also pick up some condenser coil cleaner in a spray can from your local appliance parts store, but it's not necessary (the fumes are strong and may be objectionable to your customers... it gets 'em really clean, though!) After cleaning the coils, allow 24 hours for temps to stabilize. If they don't, here is a site for Beverage-Air, contact your local servicer with you exact model and serial number for pressure specifications. http://www.beverage-air.com/technical.service.html Hope this helps! Let us know, will ya?

Posted on Aug 13, 2007

  • Tracy Farrell
    Tracy Farrell Aug 14, 2007

    Bill, with ambient air at 75 degrees, you should get a static (compressor not running) pressure of 78.8 lbs. The running temp of the coolant on the high side will shoot up to about 140 degrees. At this temperature, your high side pressure will rise to about 229 psi.

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Here's the Beverage-Air website that shows technical and repair videos for your model: http://www.beverage-air.com/repair.videos.html The videos are basic, and don't have the answer to your question. I can't access the "Customer Support" link on that site, because it asks for a serial number to continue. If you go to that link and give it the correct serial number, I'm sure that they will have that information SOMEWHERE on their support site. If not, then you will have to contact the company at 1-800-845-9800 and ask them directly what the proper R-134a pressures should be. If you need more help in answering this question, then just let us know. Hopefully this will be helpful enough to get you the answer you need. ;)

Posted on Aug 13, 2007

  • Kevin Omel
    Kevin Omel Aug 13, 2007

    This number may be more helpful in finding that answer...

    Technical Service Department: 800-684-1199

  • Kevin Omel
    Kevin Omel Aug 13, 2007

    If you're looking for just a ballpark figure, rather than an exact number, then that's different...

    I've seen them from 20 to 60, because different manufacturers make their systems differently. (Or the fridges I was checking were worn to different stages.)

    Do you know how close you are to 10 oz. right now? Given the cost of R-134a, I would say just empty the system again, inject a measured 10 oz. and call it good.

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