u/Wooden_Direction5040

Hi, I'm a pretty new apprentice, and I wanted to hear from folks how you pump down a rack compressor. I was shown what I'm fairly sure is the wrong way to do it. We were replacing a gasket on the high side of the compressor and the journeyman valved off the suction, oil lines and discharge in whatever order and blew off the high side. We replaced the gasket, then he opened the suction, cracked and blew out the air via the discharge (blow and go?), then opened everything up.

I'm replacing another gasket on Monday and want to learn what the right way is.

Hi, I'm pretty new and wanted to know what you think. I was just at a store, 404a rack, hot gas defrost. Some circuits showed that defrost peak temp on the cases/WI are below 32 degrees. A few 31s, one WI was 27. That walk-in had the front of the coil iced up, not the back, which seems unusual.

Hot gas defrost is set to time only, about 15-20min. Pressure drop across defrost differential valve is 35lbs.

Envirogard III rack. Also condensrt head pressure setpoint is really low for some reason at 120psi. It did measure around 175 when I was there.