Another dumb question

[Wildcard]

The receiver/dryer is full of desiccant beads. The absorb moisture and filter out particles any major repair or extended length of time open to atmosphere warrant a replacement.

Best method of leak testing a system is 200psig of nitrogen, soap bubble test and stand test for pressure drop. Nitrogen is a noble and dry gas with little to no change in psi by temp.

Pulling a vacuum in a refrigeration system 26,27 30" is irrelevant. Microns are what's needed to be measured. A tight/dry system will pull to 400 microns and hold for 30 min. Moisture doesn't boil until certain conditions are met in a vacuum in relation to temperature...these are measure in microns. Moisture in a refrigeration system causes copper plating and acid to build in the oil.