Removing oil from a compressor with only an oil fill plug is performed using the following general guidelines:
1. If possible, run the compressor fully loaded. Then, close the suction service valve and reduce the crankcase pressure to 0 psig. Note that the low pressure switch may have to be bypassed.
2. Stop the compressor and isolate it from the system by closing the discharge service valve.
3. Remove the oil fill plug. Use the refrigeration oil pump with the siphon kit to remove the oil from the compressor. Continue to remove the oil in this manner until the oil is lowered to the proper level in the compressor, or if applicable, all the oil is removed. Replace the plug.
NOTE: If all the oil was removed from the compressor, make sure to refill the compressor with new oil. Use the closed system method for charging oil previously described in this section.
4. To remove any moisture that may have entered the compressor, evacuate the compressor to 500 microns (29.92 inches of mercury) as described in SP-3.
5. Open the suction and discharge service valves. Restart the compressor.
6. Run the system for about 20 minutes fully loaded and then recheck the oil level at the sightglass.
