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actech 03-12-2014 12:45 PM

R-22 beer cooler
 
I am working on a 5 -ton R-22 beer cooler in a gas station. It trip on high pressure last night. When I checked the pressures they were low

low side 39.8
high side 193.5
low temp was 52.5
highr side temp was 94.3
Super heat was 38.2 and subcool was 4.8

Sounds low on charge to me. but what keeps tripping the high limit?

What Vsat should a beer cooler be run at? I was thinking maybe around 25 degrees?

WyrTwister 03-12-2014 04:47 PM

Quote:

Originally Posted by actech (Post 1320923)
I am working on a 5 -ton R-22 beer cooler in a gas station. It trip on high pressure last night. When I checked the pressures they were low

low side 39.8
high side 193.5
low temp was 52.5
highr side temp was 94.3
Super heat was 38.2 and subcool was 4.8

Sounds low on charge to me. but what keeps tripping the high limit?

What Vsat should a beer cooler be run at? I was thinking maybe around 25 degrees?



Is air flow at the condensing coil OK ?

God bless
Wyr

beenthere 03-12-2014 06:00 PM

What was the outdoor temp when you were checking it. If it was below 70 you may have a restriction in the refrigerant circuit.

actech 03-12-2014 08:39 PM

yes air flow is great at the outside coil 2 new fans. It was about 70 degrees outside. Why would you say restriction, low head pressure or high super-heat? I did add a little r-22 to get a better super heat, but when I did of course the vsat went up to 32 or so. I would think the coil definitely needs to stay below freezing. I can get it to 15 degrees superheat and 10 subcool, but that cant be right for a beer cooler the vsat would be 40 - 50?

beenthere 03-12-2014 09:04 PM

Your head pressure is up high enough for temps of 70 degrees or less outside. You have a high SH. Indicates that the refrigerant isn't being fed to the evap as much as it should.

actech 03-13-2014 09:36 AM

I have 3 evaporator circuits with two fans on each. Do I need to check the supreheat at the backside of each individual evaporator to find out which one is restricted?

yuri 03-13-2014 10:02 AM

What turns on the condenser fans? A relay or contactor? Either way that could be intermittently sticking off and you have no fans.

actech 03-13-2014 11:01 AM

Fans run 24/7 it's med temp cooler

beenthere 03-13-2014 05:36 PM

Quote:

Originally Posted by actech (Post 1321388)
I have 3 evaporator circuits with two fans on each. Do I need to check the supreheat at the backside of each individual evaporator to find out which one is restricted?

Yes. Anyone of them could be starved, while the other 2 are feeding as much as they can to maintain walkin temp.


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