To use sight glass or not
ISo the other day I had a walk in cooler low on gas. R22 to be exact, I found and fixed two leaks. Had a coworker bring me some more r22. After installing a new fan cyce control begain charging the unit. Got the box to 42° with a 20° superheat and then box was down to 38° when I left.
Ive always been told to keep a full glass to ensure all liquid to txv. Manager says to charge to the correct superheat and not worry how full the glass is and coworker says only with R22 you should charge to a full glass