Copeland™ Semi-hermetic Compressor Copeland Discus™ Compressor with Unique ‘Discus’ Valve Design Reliability High Energy Effi ciency Modular Components Replacement Serviceability Positive Displacement Oil Pump Application Flexibility Low Profi le More Cooler Space, Fewer Stockouts, Application Flexibility. Run hot and the compressor will not pump enough oil to properly lubricate the compressor bearing. Running in this condition can cause bearing damage and or a compressor burn out. Low Oil: Low oil may be caused by either an excessive amount of liquid refrigerant that washes out the oil in the sump of the compressor, and/or low oil charge.
Hi everyboby!! My very first post
According to the Copeland manuals available to me, the net oil pressure ( pump discharge pressure minus suction pressure) must be not less than 9 psi for an effective compressor lubrication. On new compressors, I remember watching the pump discharge pressure go up to 50 - 60 psi (low temp systems), with suction pressures 20´s and below.
As the oil was getting kinda dirty in the sight glass, I changed oil and cleaned up the screen mesh and pump in this low temp compressor. Now, as I put the pump back in service, I read pump discharge pressures in the 30´s with suction pressures in the 10´s. That means about 20 psi of net oil pressure (well above the 9 psi recommended value). Even so, the PENN 545 electronic oil pressure controls keeps shutting down the system. This didn´t happen before I serviced the pump. What´s wrong here?