Multi-split air conditioner control method and system thereof

Abstract

The invention relates to a multi-split air conditioner control method and a system thereof. The method comprises the following steps that 1, the inlet water temperature T 1 and the outlet water temperature T2 of a water heat exchanger are detected in real time; 2, the T1 and the T2 are compared with the set first low temperature t1; when the inlet water temperature T1 or the outlet water temperature T2 is smaller than or equal to the first low-temperature t1, the operation state of an air conditioner system is detected; 3, when the condition that the air conditioner system is in an off state is detected, a water pump connected with the water heat exchanger and a water tank is started; 4, when the condition that the air conditioner system is in an operation state is detected, the air conditioner system is automatically switched into a heating standby mode, and a throttling component of a heat recovering device of the air conditioner system is opened. The method and the system have the advantages that the influence on the operation reliability of the system since the water in the water heat exchanger of the heat recovery device is frozen under the low-temperature condition can be effectively prevented.

Description

technical field [0001] The invention relates to the technical field of air-conditioning equipment, in particular to a control method and system for a multi-connected air-conditioning system. Background technique [0002] At present, in order to improve the comfort of air conditioners, there may be different demands for cooling and heating in transitional seasons. For a single set of multi-connected air conditioning system, it must be able to meet the cooling and heating demands at the same time. In the prior art, three The controlled multi-connected air-conditioning system can meet this demand, and multiple indoor units can simultaneously turn on two different modes of cooling or heating. [0003] In the repeated refrigeration cycle of the air conditioner, the refrigerant will generate a lot of heat. If this part of the heat is fully utilized, it will have great significance in the field of energy saving in daily life. The existing practice is to add a heat recovery device ...

AI Technical Summary

Problems solved by technology

The existing practice is to add a heat recovery device to the three-pipe multi-connected air-conditioning system, and use the waste heat of the air conditioner to make hot water. At present, the water-side heat exchangers used in the heat recovery device are mostly plate heat exchangers and casing heat exchangers. However, in some cold areas in the north, when the ambient temperature is lower than 0 degrees, the residual water in the water side heat exchanger may freeze, block the pipeline, and affect the reliability of the system operation at the next startup

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