Multi-connected system and its mode switching control method

Abstract

The invention discloses a multiple on-line system and a mode switching control method thereof. The method includes the following steps that when any of a plurality of indoor units receives a mode switching instruction, the indoor unit sends the mode switching instruction to a flow distribution device; and when judging that the indoor unit is switched into a heating mode from a refrigerating mode according to the mode switching instruction, the flow distribution device controls a refrigerating control valve corresponding to the indoor unit to be closed, and before controlling a heating control valve corresponding to the indoor unit to be opened, the flow distribution device adjusts the opening degree of a throttling element in the indoor unit to be a first target supercooling degree so that the front and back pressure of the heating control valve corresponding to the indoor unit can be balanced. According to the method, when the indoor unit is switched into the heating mode from the refrigerating mode, the supercooling degree of the indoor unit is adjusted to be the first target supercooling degree by adjusting the opening degree of the throttling element in the indoor unit so that the front and back pressure of the heating control valve corresponding to the indoor unit can be balanced, and therefore noise generated during mode switching is lowered, and user experience is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a mode switching control method of a multi-connection system and a multi-connection system. Background technique [0002] For buildings using multi-connected systems, there are often situations where there are both cooling loads and heating loads. At the same time, due to changes in user needs, the operating mode of indoor units often switches from cooling mode to heating mode, or from heating mode Switch to cooling mode. [0003] When the mode is switched, when the cooling control valve (heating control valve) of the indoor unit is opened, it is inevitable that due to the difference in the pressure distribution in the system, there will be a problem of excessive pressure difference between the front and rear of the valve body, resulting in relatively large noise , affecting user experience. Contents of the invention [0004] The present invention aims to solve one o...

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Problems solved by technology

[0003] When the mode is switched, when the cooling control valve (heating control valve) of the indoor unit is opened, it is inevitable that due to the difference in the pressure distribution in the system, there will be a problem of excessive pressure difference between the front and rear of the valve body, resulting in a large noise , affecting user experience

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