Due to environmental concerns, when the air conditioning system is drained, the refrigerant must be collected using refrigerant recovery/recycling equipment. Federal law requires that refrigerant be recovered into appropriate recovery equipment and the process be conducted by qualified technicians who have been certified by an approved organization, such as MACS, ASI, etc. Use of a recovery machine dedicated to the appropriate refrigerant is necessary to reduce the possibility of oil and refrigerant incompatibility concerns. Refer to the instructions provided by the equipment manufacturer when removing refrigerant from or charging the air conditioning system.
Do not operate the A/C compressor without enough refrigerant in the system. If there is not enough refrigerant in the refrigerant system oil lubrication will be insufficient and compressor burnout may occur. Do not open the high pressure manifold valve while the compressor is operating. If the high pressure valves opened, refrigerant flows in the reverse direction and could cause the charging cylinder to rupture, so open and close the only low pressure valve. Do not overcharge the system with refrigerant. If refrigerant is overcharged, it causes problems such as insufficient cooling, poor fuel economy, engine overheating etc.
Do not handle refrigerant in an enclosed area or near and open flame. Always wear eye protection. Take care not to get liquid refrigerant in your eyes or on your skin.