I have a reachin produce cooler that is shutting down. The high pressure control is shutting the compressor down. Here are the symptoms. The cooler is a r404 unit. It was 95 dg. Ambient.
High head pressure, should be 330 but was reading 380
High low pressure, should be 50 but was reading 68
High superheat, it was 20 dg to high
Low sub cooling, about 2 dg low.
The cooler should be around 38 dg but it keeps shutting down and warming up.
I'm thinking that there is air or non condensables in the system. I'm thinking I should recover the refrigerant, evacuate and change change the filter drier. Then recharge with virgin refrigerant.
Any opinions would help.