[Browncrow]

I have a display case the system won't drop under 32 degrees discharge air temp. Sometimes it stalls at 33 and others times it went up a few degrees. Suction 63 # high side 255 # I fixed a leak on the receiver and charge it to clear sight glass I got a 7 degree superheat should be 6-8 . When I take the shelves out it pulls to 32 with shelves in it goes to 38. R/H of store is 65% ambient 74.
Anything I' should be looking for other than possibly its short cycling the condensing airflow from underneath I'll check that but ...
thanks for any input

 

[Browncrow]

Thanks for the reply it's a
Structural SB57543924
S # 0012152KQ257247
Air temp entering condenser is 74 but in the mornings it sits by 2 warming ovens so the air temp entering can get higher but it's been working since 2013 with this configuration.
Thanks

 

[Browncrow]

Yes sir i did that one first thing I closed the receiver valve which is how I found the leak in the cap bubbling oil when I took it off. It pumped down and shut off on the low pressure

 

[Browncrow]

Yes sir it is r404. I've worked on quite a few and usually only see the low side this high when it first starts that's why I'm stumped. Usually will throttle down to 45-50 low side. It's a high volume store and they had the front door open and it was raining off and on trouble is they have another display case SB5755 a little bigger at a right angle to this one and it pulls down to 22 degrees and cycles , this one I'm working on will pull down then actually raise temp

 

[Browncrow]

We need case manufacturer and model number. Else, we're running in circles guessing.

I'd guess it's low airflow due to dirty honeycombs and possible fan issues....or...it could be a weak compressor.

Get your compressor model, pressures, amps and incoming voltage and the manufacturer's performance data sheet. That will tell you right off the bat if you're compressor is doing what it's supposed to be doing.

Sorry for not being able to use quote before I'm kinda new to posting forum although I've been around a while lurking.
It's a STRUCTURAL CONCEPST SB5754
It's a open front chill with a top portion that has display case for pastries. The top Portion had baffles that can be turned allowing the pastries to be chilled once I turned them closed it started pulling down. I think with the warming ovens and the pastry door on backside was allowing heat inside every time they opened and it would mess with the chilled part. Thanks for all the support and responses