A proper oil control system is essential to ensuring compressor lubrication and energy efficient cooling. Excessive oil in a refrigerating system can lead to oil slugging to the compressor. This can damage a compressor in the same manner as liquid refrigerant slugging.
Removing or reducing the amount of oil that enters the intake line increases the yield of the refrigeration plant. Large amounts of oil in a refrigeration or air conditioning system reduce the yield of the system since the oil film that deposits on the internal walls of the evaporator and condenser, reduce the heat exchange.