Indoor unit control method in multi-connected system and multi-connected system

Abstract

The invention discloses a multi-split air conditioning system and an indoor unit control method thereof. The multi-split air conditioning system comprises an outdoor unit and a plurality of indoor units. The indoor unit control method includes S1, acquiring the actual superheat degree of every indoor unit and acquiring the low-pressure-side pressure and return air superheat degree of the outdoor unit; S2, after continuous preset times of acquiring, when the acquired actual superheat degree of any one of the indoor units and the return air superheat degree of the outdoor unit satisfy a first preset condition, or the acquired actual superheat degree of any one of the indoor units and the lower-pressure-side pressure of the outdoor unit satisfy a second preset condition, stopping superheat degree control of the corresponding indoor unit, and performing throttle valve mistuning prevention on the corresponding indoor unit. The indoor unit control method in an embodiment has the advantage that user experience under running conditions of high temperature refrigerating and low temperature refrigerating of the multi-split air conditioning system is improved greatly.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method for controlling an indoor unit in a multi-connection system and the multi-connection system. Background technique [0002] In the field of multi-connected central air conditioning, the throttling component is one of the four core components of the refrigeration system, and its necessity and importance are self-evident. As the most widely used throttling component, there are many control methods for electronic expansion valves, especially the superheat control method basically adopted by mainstream air-conditioning companies. The superheat control method can not only adaptively balance the flow of each indoor unit, but also avoid the liquid return of the outdoor unit. In addition, the superheat control also has certain advantages in terms of noise control and refrigerant charging volume. Despite the above-mentioned advantages, superheat control in some operating...

AI Technical Summary

Problems solved by technology

Despite the above-mentioned advantages, superheat control in some operating states, such as high-temperature refrigeration and low-temperature refrigeration, still cannot take into account the special requirements of the system in some actual operating states due to its hysteresis, resulting in poor user experience

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