1. If the system is depressurized, for example, during installation or repair, it must be evacuated from the system using a system for draining, recycling and charging with R-134a refrigerant. (If the system has been open for several days, it is necessary to replace the receiver-drier and evacuate the air for several hours).
2. Connect drain, recycle and refill system (A) R-134a refrigerant to the high (IN) and low (WITH) pressure according to the manufacturer's instructions.
3. After about 10 minutes, verify that the low pressure gauge shows a vacuum below 93.3 kPa. If vacuum cannot be obtained, this indicates a leak in the system. Partially charge the system and test it for leaks.
4. Remove the low pressure valve from the low pressure service port.