Arrived at location on 7/12/22 -Found evaporator froze up solid and could not remove cover. Had all product removed. And will need to return when coils are clear of ice. Returned to location on 7/13/22 - All ice was melted but the drain was clogged. I blew out the drain and all of the water drained out of the unit. I turned the unit back on and compressor fired up, condenser fan started, and both of the evaporator fans started. Unit started coming down to temp so I installed piercing valves to the high and low side of unit and hooked my gauges up. My pressures were perfect and there appeared to be no issues. The only way the unit could have froze up was from the drain line being clogged and the water pooling up the the evaporator and freezing on the evaporator. Now that I cleared the drain line there should be no further issues.