Compressed air mixed with R-134a forms a combustible vapor. The vapor can burn or explode causing serious injury. Never use compressed air to pressure test R-134a service equipment or vehicle air conditioning system.
Air conditioning refrigerant or lubricant vapor can irritate your eyes, nose, or throat. Be careful when connecting service equipment. Do not breathe refrigerant or vapor.
- Connect a R-134a refrigerant recovery/recycling/charging station to the high-pressure service port and the low-pressure service port, following the equipment manufacturer's instructions.
- Open pressure valves to charge the system to the specified capacity, then close the supply valve, and disconnect the charging station fittings.
- Check the system for leaks using a R-134a refrigerant leak detector with an accuracy of 14 g (0.5 oz) per year or better.
- If you find leaks that require the system to be opened (to repair or replace hoses, fittings, etc.), recover the system.
- After checking and repairing leaks, the system must be evacuated.