Abstract: Poor system sealing has two main impacts on air conditioning: firstly, air can enter the system through leakage points, leading to reduced cooling performance; secondly, refrigerant leaks can result in decreased cooling efficiency, reduced compressor lifespan, and even environmental pollution issues. Research on the sealing performance testing methods of air conditioning outdoor units, in accordance with the national standards related to the sealing requirements of refrigeration and air conditioning equipment. Various methods such as gas tightness tests, vacuum tests, and halogen leak detection are employed to effectively identify air conditioning units with poor seal integrity, thereby preventing them from entering the market.

Key words: Refrigerant leakage, Environmental pollution, Sealing integrity testing, Air tightness test, Vacuum testing, Fluorine leak detection