Air Conditioning Maintenance Procedure:

1. Comprehensive Inspection. In case of failures in various air conditioners, a thorough inspection is required. First, check the machine's pressure and the operating temperatures at various points in the system; for split systems, this must be done with the indoor and outdoor units connected; connect a pressure gauge to measure the compressor exhaust pressure, ensuring it's connected when the machine is stationary to avoid high temperatures and burns during operation; use your hand to feel the temperature of the compressor exhaust port to the condenser section, 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 before welding 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 individually, power operation is prohibited when the high-pressure or low-pressure valves are closed to prevent overpressure and potential system burst accidents, or compressor vacuum operation leading to explosions. When inspecting the outdoor fan system, power operation is required, and it must be ensured that the air conditioner panel and fan grille are properly installed.