Air Conditioning Maintenance Procedure:

1. Comprehensive Inspection. In case of failure in various air conditioning units, a thorough check is required, initially detecting parameters such as machine pressure and running temperatures at various system points; for split units, this must be done with the indoor and outdoor units connected; connect a pressure gauge to detect the compressor exhaust pressure, ensuring it's done when the machine is stationary to prevent burns from high temperatures during operation; feel the temperature of the compressor exhaust port to the condenser section of the piping with your hand, first quickly testing with your fingers to avoid injury.

2. Welding Operations. Prior to welding, the refrigerant in the system must be released. Always wear protective eyewear during welding to prevent eye injury; during the release of refrigerant, operators should not face the process opening or direct the gas towards others to avoid frostbite from refrigerant. Adhere to welding operation requirements 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 when the high-pressure valve or low-pressure valve is closed to avoid accidents such as system burst due to excessive pressure or explosion due to the compressor running in a vacuum. When inspecting the outdoor fan system, it must be powered on and the air conditioner panel and fan grill must be properly installed.