I have a customer with a True reach in that had the CPR valve fail closed. The resulting low flow rates caused the compressor to run out of oil and ruin the rods and pistons.
When I tore down and rebuilt the compressor it was missing about half the oil. Since there was no leaks, I'm assuming the oil must be in the coils and piping.
I can easily blow out the condenser, but is there a way to clear out the evaporator without removing the cap tube?
I know the oil will return once everything is working right, but then the compressor will be overfilled. Additionally I wanted to switch it to POE and R-404a (it had a 502 drop in in it.) so I don't want all that mineral oil in the system.