I have a R-22 walk-in cooler at the camp that isn't keeping temp.
The temp now is 50° and I need to get the temp down to 35°to 38°.
The compressor is pot type and air cooled.
There is no t-stat,it runs off a dual pressure control.
There are three cold pack style gravity evaporators with one TXV feeding them.
The suction pressure is 25 psig and I can't seem to get the king valve to break free on the high side.
It has a receiver and sight glass and the sight glass was'nt clear when I first looked at the unit.
I tried to clear the sight glass by adding refrigerant slowly,but the glass would clear and after awhile it would go back to the way it was when I first looked at it with barely any in the sight glass.
The pressure switch's are set at cut-in=30psig and cut-out=10psig.
Two out of the three cold packs(evaps)where froze and one was not.
The suction pressure was remaining steady at 25 psig .