Abstract: A refrigeration system including a coalescent oil separator for removing oil from a refrigerant gas and oil mixture discharged from a compressor. Upon a pressure condition being exceeded a directional flow valve opens to allow the refrigerant gas and oil mixture to bypass the coalescent oil separator. There is included a method for servicing the coalescent oil separator without having to resort to shutting down the refrigeration system or removing the refrigerant material.

Abstract: A purge system operable to remove lubricant from a liquid refrigerant material removed from an evaporator of a mechanical refrigeration system. The contaminated liquid refrigerant is delivered to the purge system by gravity and the separated lubricant is returned to the compressor sump by force from a pressurized fluid. Refrigerant vapor is separated from the contaminated liquid refrigerant by heating and returned to the evaporator of the mechanical refrigeration system.

Abstract: An improved system for recovering and charging refrigerant of a refrigeration system. The system includes a series arrangement of two gas compressors that boost the pressure of the recovered refrigerant to a high enough level for storage in a DOT-3AA type cylinder. The recovered refrigerant is not condensed to the liquid state during recovery, nor is the cylinder chilled. The second high-pressure compressor includes a free-floating piston within a cylinder. The piston is hydraulically actuated. The system includes microprocessor control. The system is well suited for recovery of refrigerants such as R-13, R-23, R-503, and SUVA-95.

Abstract: A portable apparatus for recovering high-pressure CFC refrigerants in vapor form includes a removable tank for receiving and storing the liquefied refrigerant to be recovered and two refrigeration circuits. The first refrigerant circuit processes the refrigerant to be recovered and includes a compressor and a condenser. The removable tank acts as the evaporator of the first refrigeration circuit. The second refrigeration circuit is included to cool both the condenser of the first refrigeration circuit and the removable tank. This second refrigeration circuit includes a compressor, a condenser and an evaporator, and contains a second refrigerant physically isolated from the refrigerant to be recovered. Both the condenser of the first refrigeration circuit and the evaporator of the second refrigeration circuit are preferably coil shaped, with the condenser coil preferably coaxially arranged within the evaporator coil.

Abstract: An auxiliary purge unit to be retrofitted to the existing purge unit of a low pressure refrigeration system includes a double-walled condenser portion, a pneumatic pressure chamber and a discharged-refrigerant tank. The double-walled condenser portion includes inner and outer walls with a chilled condensing coil disposed between the two walls, a stand pipe to create a reservoir of condensed refrigerant between the stand pipe and the inner wall, and an exhaust port for exhausting non-condensibles from the system. The pneumatic pressure chamber pressurizes the gas to be purged from the refrigeration system and delivers it to the chilled condensing coil. The discharged-refrigerant tank includes a float valve to prevent fluids from exiting the tank unless the valve is in the open position, and allows the elevated pressure of the system to be maintained.