Multi-connected air conditioner, multi-connected defrosting control system and multi-connected defrosting control method

Abstract

The present invention provides a multi-connection defrosting control method. Firstly, it is judged whether the indoor unit is in the power-on state, and when the power is turned on, it is judged whether the indoor unit executes the extremely fast defrosting function, and if so, the auxiliary electric heating function is turned on, and the fan of the indoor unit is controlled to work; If the fast defrosting function is not enabled, follow the normal defrosting method. When shutting down, judge whether the indoor unit is turned on to perform the ultra-fast defrosting function. If so, turn on the auxiliary electric heating function and control the fan of the indoor unit to work. If not, follow the conventional defrosting method. Through the above control method for multiple units, during the heating operation of the air conditioning system, if the outdoor unit meets the defrosting conditions, the system enters the ultra-fast defrosting operation mode. The frost time ensures the user's thermal comfort experience. The invention also provides a multi-line defrosting control system. The invention also provides a multi-connected air conditioner.

Description

technical field [0001] The invention relates to the technical field of air conditioners, and more specifically, to a multi-connected air conditioner, a multi-connected defrosting control system and a multi-connected defrosting control method. Background technique [0002] The multi-split unit is a refrigeration cycle system composed of one or more outdoor units connected to multiple indoor units. When the heat pump multi-split unit is heating at low temperature, the heat exchanger of the outdoor unit is prone to frost, and the heat exchange efficiency drops sharply. Affect the heat exchange effect. In order to avoid the continuous decline of the heating effect, the system will enter the defrosting mode at this time. During the defrosting period, the system operates in cooling mode, using the heat released by the high-temperature and high-pressure gas discharged from the compressor to melt the frost layer of the outdoor heat exchanger, and the refrigerant in the heat exchange...

AI Technical Summary

Problems solved by technology

During the defrosting period, the system operates as a cooling system, using the heat released by the high-temperature and high-pressure gas discharged from the compressor to melt the frost layer of the outdoor heat exchanger, and the refrigerant in the heat exchanger of the indoor unit evaporates and absorbs heat. The method is to turn off the indoor fan, but this operation will affect the heat exchange effect of the indoor heat exchanger, so that the defrosting time of the outdoor unit will be longer

[0003] At present, the defrosting process of the heat pump multi-connection will last (4-10) minutes. After the defrosting process is over, the system will return to the heating mode. Generally, it will take (3-5) Minutes, that is, during this (7-15) minutes, there is basically no heating effect on the indoor side, and the room temperature will continue to drop, seriously affecting the user's thermal comfort experience

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