Air Conditioning Maintenance Procedure:

1. Comprehensive Inspection. When air conditioning units from various sources malfunction, a thorough inspection is required. First, check the machine's pressure and the operating temperature values at various points in the system; for split units, this must be done with the indoor and outdoor units connected. Connect a pressure gauge to detect the exhaust pressure of the compressor when the machine is stationary to avoid high temperatures and burns during operation. Use your hands to feel the temperature of the compressor exhaust to the condenser section of the piping. Use your fingers to quickly test the temperature first to prevent injury.

2. Welding Operations. Prior to welding, release the refrigerant from the system. Always wear protective eyewear during welding to prevent eye injury. Avoid facing the process opening or releasing gas towards others while emptying the refrigerant to prevent frostbite. 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, do not operate it with power when the high-pressure valve or low-pressure valve is closed to prevent overpressure causing a system explosion or the compressor running at vacuum leading to an explosion. When inspecting the outdoor fan system, power operation is required and it must be ensured that the air conditioning panel and fan grill are properly installed.