Have any of you guys worked on Kanto Seiki Oilmatic Oil Coolers. I am working on two of them now, Model # KTV-5C-HTMI. The first one had a tripped contactor overload for the compressor and the air cooled condenser and fluid submerged evaporator was very dirty. The condenser was packed with oil and dust and the evaporator had a ¾ layer of metal sludge over it. I removed the cooler from the reservoir tank, cleaned the coils and tightened all of the electrical connections. There is no access valves to connect gauges to, at least not Standard ¼ gauges. It does have some sort of access fitting on the suction line, but I have never seen one like this before. Put the unit back in place, wired it up, started it and it was cooling. Then I noticed that the cap tube was icing up where it connects to the evaporator coil, but the suction line was not. Looks like there may be an obstruction in the cap tube. Its not cooling the fluid very well either, the fluid was 91 deg. F and after 3 hours, came down to 88 deg. F. Is it normal for the cap tube to ice up on these units?
The other Oil Cooler was in the same condition, but also had a leak, I put a line tap valve in, recover about 8 ozs. of R-22 and installed braze in access valves on the liquid and suction lines. The Name Plate is messed up and I couldnt tell how much R-22 it holds, Looks like it may be 600 g. This is most likely a critically charged unit, so I would like to weigh in the refrigerant. Any idea how much it holds?