My system was inspected by the technician today, and we confirmed that indeed the shaft seal (carbon, with spring) was now leaking (having passed pressure and vacuum testing originally). Also would not hold 30" vacuum - slumped to 24 in about 10-15 minutes. He pressure tested with nitrogen gas, and (only) on my insistence we checked the oil level in the compressor after degassing the system. Initially he said he would need to take it to the work shop to do this so he could drain it to measure what came out..... I pointed out that the service
manual details an exact and easy method of measuring via dipstick, in situ.
The dipstick came back up with a tiny drop at the end, and was wet only a few mm up. The manual specifies 25-37mm in the sump (vertical install).
The tech wrote this off to oil migrating in to the system, and normal behaviour as it'd return.....wow.
When the system was charged with oil, it was done so via the suction line. The manufacturer CCI has since got back to me and said this is definitely not a method they condone, and could result in damage to compressor. A large local automotive/industrial outfit made the same comment.
I'm having them assess the compressor, but unsure if their findings can clarify cause of seal failure, though under lubrication is obviously looking likely in my eyes.
I can't understand where the oil went though. When the RV went off, only maybe a couple of table spoons worth came out.
Where would you suggest going from here?