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

Abstract

The invention provides a multi-unit defrosting control method which comprises steps as follows: firstly, whether an indoor unit is in a starting up state is judged; whether the indoor unit executes a topspeed defrosting function is judged during starting up, if yes, an auxiliary electric heating function is started, a fan of the indoor unit is controlled to work, and otherwise, treatment is performed in a conventional defrosting manner; and whether the topspeed defrosting function is started and executed during shutdown is judged, if yes, the auxiliary electric heating function is started, the fan of the indoor unit is controlled to work, and otherwise, treatment is performed in a conventional defrosting manner. With the adoption of the control method of multiple units, when an air conditioning system operates for heating, if an outdoor unit meets the defrosting condition, the system enters the topspeed defrosting mode, heat is continuously obtained by starting electric heating and the fan, the defrosting time is shortened, and the thermal comfort experience of a user is guaranteed. The invention further provides a multi-unit defrosting control system and a multi-unit 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 for (4-10) minutes. After the defrosting process is over, the system will return to the heating mode. Generally, it will take (3-5) minutes from the start of heating to the normal operation of the heating system. 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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