Air Conditioner Maintenance Procedure:

1. Comprehensive Inspection. When any air conditioning units encounter malfunctions, a thorough check is required. Initially, inspect the machine's pressure and the operating temperature values at various system points; for split systems, this must be done with both 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 pipeline, first use your fingers to quickly test some temperatures to prevent injury.

2. Welding Operations. Prior to welding, release the refrigerant from the system. Wear protective eyewear first to prevent eye injury. During the refrigerant release, operators should not face the process port or release 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 system independently, do not operate it under power with the high-pressure valve or low-pressure valve closed to avoid overpressure causing a system burst or the compressor running at a vacuum leading to an explosion. When inspecting the outdoor fan system, it must be powered on, ensuring that the air conditioner panel and fan grille are properly installed.