Discussion Starter · #1 ·
I recently replaced the Copeland Scroll compressor on my 12 year old 12 seer 5 ton Rheem condensing unit. I purged the lines and coils with nitrogen, flushed with Quik-SF, evacuated, broke the vacuum with nitrogen, pressure tested with nitrogen, evacuated and charged. The liquid line drier was replaced and a suction line filter placed. The capacitor and contactor were replaced. On initial start-up the charge was too low and the compressor shuttered and stopped when the suction pressure dropped too low. I added R22, and the system operated appropriately, and cooled well. I planned on checking the system for acid and removing the suction line filter after a week, but after running well for 6 days, the a/c stopped cooling. The breaker (40 amp) had tripped. After resetting the breaker, the compressor will not start, although the fan runs. The breaker did not trip, but it did hum, suggesting high current draw, but I have not put a meter on it yet. Of note, I did not remove any oil from the new compressor, as I felt as though I removed most of the old oil with the flush. Could the compressor be locked from excess oil? Any ideas?