Abstract: This paper introduces in detail the circuit principle, data sampling and processing methods and implementation steps of air-conditioning delay protection technology, the process of establishing and calculating table-looking data, and the methods of improving timing accuracy. It overcomes the key technology that the indoor unit cannot get the power-off time when the outdoor unit power-off time exceeds the given value, so that when the outdoor unit power-off time exceeds the given value, it immediately provides 220V AC for the outdoor unit and starts the work of the air conditioner; when the outdoor unit power-off time is lower than the given value, it only needs to wait for a certain time. After subtracting the time value of power off from the given value, the power supply is provided for the outdoor unit, which can make the outdoor unit run normally as soon as possible and shorten the possible waiting time for power supply. It not only protects the pressure balance of the system, but also plays the role of rapid refrigeration and heating.

Key words: Sichuan Changhong Electric Co., Ltd. Mianyang 621000