Abstract: The unopened stop valve of the air conditioner has a great impact on the reliability and safety of the equipment. In order to study the influence law of the unopened stop valve on the air conditioner and summarize the automatic detection method, an experimental study was carried out on the unopened stop valve. Through experimental research, the change rules of system parameters under different operation modes and the combination of four stop valve switching states is obtained. Based on this, an automatic detection method of unopened stop valve is proposed. Under the condition that the system hardware configuration remains unchanged, the unopened state of the stop valve can be determined by detecting the system state parameters. The results show that this method can effectively and accurately identify the unopened state of the stop valve, and significantly improve the reliability and safety of the system.

Key words: Stop valve, Unopened, Automatic detection, Safety