Patent ID: 8047009

Claim:
A method of providing additive to a refrigerant circuit, the method comprising: connecting a pre-pressurized supply device to the refrigerant circuit at a portion of the refrigerant circuit where a circuit pressure is less than a supply device pressure that is a positive pressure above ambient pressure, the pre-pressurized supply device having an outer container with an inner bag therein and a valve interconnected with the inner bag, one end of the valve is in contact with the inner bag and a portion of the valve is engaged with a rim of the outer container, a volume of pressurized gas within an interior area of the pre-pressurized supply device (1) between the outer container and the inner bag, and (2) substantially surrounding the inner bag, being pre-pressurized to the supply device pressure using an under-the-cup gassing process to increase pressure within the supply device, the inner bag being filled with a refrigerant system additive through the valve and the outer container being a rigid container with a single opening to an exterior of the rigid container; and actuating the valve of the supply device to allow the volume of pressurized gas within the interior area of the pre-pressurized supply device between the outer container and the inner bag to act upon the inner bag and force the refrigerant system additive to flow from the inner bag through the valve engaged with the single opening to the exterior of the rigid container and into the refrigerant circuit, wherein the refrigerant system additive is not pre-mixed with refrigerant prior to the refrigerant system additive exiting the inner bag and entering refrigerant circuit, such that a performance of the refrigerant circuit is maintained at a satisfactory level.