Multi-unit system and control method of heating indoor unit thereof

Abstract

The invention discloses a multi-unit system and a control method of a heating indoor unit thereof. The method comprises the following steps: a shunt device obtains the target opening and the target duration of a throttling element in an indoor unit according to a preset opening and duration table if the indoor unit which is not started or at a refrigeration mode receives heating mode commands when the multi-unit system is at a pure refrigeration mode or a main refrigeration mode, controls the throttling element in the indoor unit to be opened to the target opening to adjust the pressure in front and rear of the throttling element, and adjusts the opening of the throttling element to the maximum opening when the target opening is operated for the target duration; a refrigeration control valve corresponding to the indoor unit is controlled to be closed after time is delayed by a first preset time; a corresponding heating control valve is controlled to be opened after time is delayed by a second preset time. The method avoids scouring noise produced when refrigerant flows rapidly and the influence on the refrigeration capacity of other indoor units by performing pressure equalizing on the indoor unit receiving the heating mode commands.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method for controlling a heating indoor unit in a multi-connection system and a multi-connection system. Background technique [0002] In the multi-connected system, the refrigerant in the outdoor unit can be reasonably distributed to the corresponding heating indoor unit or cooling indoor unit through several control valves in the distribution device to achieve simultaneous heating and cooling. [0003] When the multi-connected system is in the pure cooling mode or the main cooling mode, when the indoor unit receives the heating mode command, in the related technology, the opening degree of the throttling element in the indoor unit is immediately adjusted to the maximum opening degree, and there is a delay After a certain time, control the cooling control valve corresponding to the indoor unit to close, and control the heating control valve corresponding to the indoor...

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Problems solved by technology

However, for a period of time before the cooling control valve is closed, since the opening of the throttle element of the indoor unit is adjusted to the maximum opening, a large amount of refrigerant will flow backward from the liquid pipe side (that is, flow along the cooling flow path) into the room machine, and then flow out to the low-pressure pipe through the refrigeration control valve, there will be a large refrigerant flushing sound in the liquid pipe, which seriously affects the noise quality of the product. At the same time, because a large amount of refrigerant flows out to the low-pressure pipe through the refrigeration control valve, it will affect other refrigeration The cooling capacity of the indoor unit during this period affects the comfort of the product

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