How To Check Superheat On A Walk In Cooler. See corrective steps for low suction pressure. If the box is really warm inside, don't quite clear the glass.
Verify temperature control settings, adjust if necessary. Compressor superheat is a temperature measured on the suction line six (6) to eight (8) inches from the compressor and subtracted from the suction pressure when converted to degree f. Set the defrost time and verify the defrost initiation settings.
If leakage has been found, it means your refrigerant has been not been enough.
I am not sure what you are saying about the drier and the sight glass. Is 42 degrees ok for refrigerator? In the case of the outdoor air there’s no latent heat involved. Excessive or high superheat is an indication of insufficient refrigerant in the evaporator coil for the heat load present.