Its been awhile, but I'd like to submit these questions for the experts.
R-22 split system, med temp application. Large warehouse cooler. Box temp to maintain 37F.
Evaporator frozen, bottom 1/3 of coil.
1 As the level of refrigerant decreases due to a leak, can it be said the increased pressure drop across the T.E.V. will in fact make the coil colder for a period of time and begin the process of coil icing?
2 Once the coil is frosted over, the ice continues to build, getting thicker due to the lack of airflow across evaporator.
3 One would expect the sight glass to flash or be half full. If the lower third of the coil is frozen have we actually decreased the size of the evaporator? If this is tue then we have decreased the total charge necessary to clear the glass.
4 If the above statement is true, even though the system is low on refrigerant, the sight glass will or can be full due to the above condition. True or False?
Untill enough regfrigerant has escaped, most techs will de ice the coil, write up the ticket and collect the cash. (none on this forum OfCourse) Only to be called out the next night cause the box is still warm.