I have a unit that is tripping occasionally on oil failure, this is a walk in freezer, with two seperate compressors running (each has two evaporator)and are totally independent of each other, oil pressure is fine, 70 pounds of oil pump pressure, (ie 110 - 40 suction)
when customer arrives at warehouse in the a.m. sometimes will find it off, hits reset and starts up,
they are loading meat in the morning after processing it and then taking it out following morning frozen to ship, this is a hot gas defrost system, and I put on a temp. recorder yesterday and found that is tripped at the 12:20 a.m. defrost cycle, hard to tell if it was during beginning or at end of it?
I have manually put it into defrost and goes through fine, oil level fine,