Working the other day on a walkin freezer, R22, and I saw something strange on the compressor. a control of sorts, what its function is I'm not sure. This s on a Copeland Semi hermetic. From the King valve along with the liquid line is a 3/8" lline that goes thru a check valve I think, then it goes up an acros and through a sight glass then a right angled electri solenoid valve the the tube goes Ito the compressor above the oil sight glass by about a foot, into the compressor just under the head by about 2". The liquid line just goes to the building as it normally does, just mentioning it is a common connection on the King valve.
Now when the unit was running (ambient 73) I noted the short line between the Sov and the compressor was frosted. I just finished charging the unit and it was a hot pill down. Any ideas what it is?
Mike