Air Conditioner Maintenance Procedure:

1. Comprehensive Inspection. When various air conditioners malfunction, a thorough check is required, first testing the machine's pressure and the operating temperatures at various system points; for split units, this must be done with the indoor and outdoor units connected; connect the pressure gauge to measure the compressor exhaust pressure, ensuring it's done when the machine is stationary to avoid high-temperature burns during operation; use your hand to feel the temperature of the compressor exhaust port to the condenser section, initially use your fingers to quickly test some temperatures to prevent injury.

2. Welding Operations. Prior to welding, the refrigerant Freon must be released from the system. When welding, wear protective eyewear first to prevent eye injury. During the release of Freon, operators must not face the process port or exhale towards others to avoid frostbite from the refrigerant. Adhere to the relevant welding operation requirements during welding to prevent poor installation or injury to others.

3. Power Operation. When repairing the outdoor unit of a split air conditioner separately, power operation is prohibited with the high-pressure or low-pressure valves closed to avoid accidents such as system burst due to excessive pressure or explosion accidents caused by the compressor running in a vacuum. When inspecting the outdoor fan system, power operation is required, and it must be ensured that the air conditioner panel and fan cover are properly installed.