Abstract: A hand-transportable unit for transferring refrigerants between containers includes a pump to remove refrigerant from a first container The pump is driven by a pneumatic motor. The pump is capable of transferring refrigerant in liquid form, vapor form, or simultaneously in both forms. A condenser for cooling refrigerant is in fluid communication with the pump. The unit also includes a compressor for driving the pneumatic motor to operate the pump. Optionally, the pump may be powered from an external source of compressed gas. The other components of the unit are mounted to a handcart including a frame and wheels to facilitate movement of the unit. In a preferred embodiment, unit is configured for self-evacuation by use of the pump in order to avoid cross-contamination of different refrigerants during subsequent use of the unit.

Abstract: A hand-transportable unit for transferring refrigerants between containers includes a pump to remove refrigerant from a first container. The pump is driven by a pneumatic motor. The pump is capable of transferring refrigerant in liquid form, vapor form, or simultaneously in both forms. A condenser for cooling refrigerant is in fluid communication with the pump. The unit also includes a compressor for driving the pneumatic motor to operate the pump. Optionally, the pump may be powered from an external source of compressed gas. The other components of the unit are mounted to a handcart including a frame and wheels to facilitate movement of the unit. In a preferred embodiment, unit is configured for self-evacuation by use of the pump in order to avoid cross-contaimination of different refrigerants during subsequent use of the unit.

Abstract: A liquid refrigerant transfer system includes a low-pressure liquid refrigerant pump coupled by drain hoses between a refrigeration system liquid refrigerant service or drain fitting and a liquid refrigerant storage tank. Another hose couples the refrigerant storage tank with a vapor refrigerant service or fill fitting of the refrigeration system. Preferably, a quick disconnect coupling is provided at least between the drain hose and the refrigerant storage tank to facilitate the removal of the filled tank and the substitution of a second, empty tank to continue the transfer. The vent hose carries liquid refrigerant vapor and any liquid refrigerant overflow back into the refrigeration system, thereby permitting substantially unattended use of the system. The system can be used to transfer liquid refrigerant back from the storage tank back into the refrigeration system through the drain opening.