I am working on a Trane rooftop condensing unit. I found the oil pressure switch jumpered out (no by me). The switch was bad, so I replaced. At the same time, I saw no oil in the site glass, but this system is know for its "oil traps", due to poor piping installation. I went ahead and added almost a half gallon of oil, just to be safe. There are no apparent leaks in the system, so the oil should be "out there somewhere".

Refrigerant pressures look fine as well, but the compressor locks out after 10-15 seconds, on amperage overload. It runs about 100-115 amps at startup w/a lockout of 107.

I'm guessing that I have some mechanical issues inside the compressor, but I am stumped. Is there an internal oil pump? Would the high amperage be a result from this if there is one?

Any advice is greatly appreciated.


Specs:
Trane
M# RAUCD104BC032BD1
RLA = 77 amps