Parts Replacement Precautions

WHEN REPLACING PARTS ON A/C SYSTEM




1. Never open or loosen a connection before discharging the system.
2. Seal the open fittings with a cap or plug immediately in disconnected parts to prevent intrusion of moisture or dust.
3. Do not remove the sealing caps from a replacement component until it is ready to be installed.
4. Before connecting an open fitting, always install a new sealing ring. Coat the fitting and seal with refrigerant oil before making the connection.
5. Because of the differences in the physical properties and characteristics between R12 and R134a refrigerants, the compressor oil for lubricating the air compressor and other system parts are not interchangeable between the R12 and R134a systems. Use the utmost care to avoid using the wrong ones. The compressor oils and some other materials are not visually distinguishable. To avoid any misuse, be sure that the materials for the R12 system and those for the R134a system are separately controlled.
- If an 0-ring usable only for the R12 system is used for the R134a system by mistake, the O-ring will foam and swell, subsequently causing the refrigerant to leak.
- If the compressor oil specified for use in the R12 system is inadvertently used for the R134a system, the compressor will lock.

WHEN INSTALLING CONNECTING PARTS




FLANGE WITH GUIDE PIN TYPE
Check the condition (damages or missing) of the O-ring and lubricate using compressor oil. Hand tighten the nut by pushing the one side pipe. Tighten the nut to specified torque.