APPARATUS AND METHODS FOR PLACING AN ADDITIVE FLUID INTO A REFRIGERANT CIRCUIT
A supply canister (28) is partially filled with a refrigerant circuit additive liquid (10) and is partially evacuated. Additive liquid from the canister (28) may be placed into the refrigerant circuit (23) of an air conditioning system by (1) connecting the canister (28) to the circuit after it has been emptied and a vacuum pressure created therein, (2) connecting the canister (28) to the refrigerant circuit suction line (12a) during system operation, or (3) connecting the canister (28) to the suction line (12a) with the system off, to thereby force refrigerant from the circuit (12) into the canister (28), and then starting the system to cause the vacuum pressure in the suction line (12a) to draw the contents of the canister into the refrigerant circuit.