Method for controlling indoor machine during heating of multi-connected central air conditioner

Abstract

The invention discloses a method for controlling an indoor machine during the heating of a multi-connected central air conditioner, which comprises a starting and heating stage, a detection stage, an operation stage and a stopping stage. After heating, the exhaust temperature of a compressor of an outdoor machine is detected, and when the exhaust temperature of the compressor is smaller than a first set value, an electronic expansion valve is opened for a normal opening; when the exhaust temperature of the compressor is larger than the first set valve, an indoor electronic expansion valve without participating in the heating is controlled to open from the normal opening up to an opening of 130 degrees; the exhaust temperature of the compressor is detected again, and when the exhaust temperature of the compressor is smaller than a second set value, the electronic expansion valve is opened to the normal opening; and when the exhaust temperature of the compressor is larger than the second set value, the indoor electronic expansion valve is opened within the range of the normal opening. The method has the advantages that the opening of the indoor electronic expansion valve is controlled by detecting the exhaust temperature of the compressor so as to effectively restrain cooling media from accumulating in the indoor machine which is not operated and ensure that the air conditioner is operated with high performance, thus the heating efficiency can be greatly improved.

Description

technical field [0001] The invention relates to a multi-connected central air conditioner, in particular to a method for controlling indoor units of the multi-connected central air conditioner during heating, which can prevent refrigerant from accumulating in unoperated indoor units. Background technique [0002] Generally, an air conditioner is composed of a heater, a refrigerator, a purifier, etc., which can cool, heat or purify indoor air, and create a suitable indoor environment for users. [0003] Multi-connected central air conditioners can be effectively applied when two or more air conditioners need to be installed in a home, or when one air conditioner is installed in each office in a building with multiple offices. The multi-connected central air conditioner has an outdoor unit and multiple indoor units connected to the outdoor unit, and its effect is the same as that of setting multiple split type air conditioners respectively. [0004] When the air conditioner i...

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Problems solved by technology

[0006] However, when the existing multi-connected central air conditioners operate in the heating mode, not all indoor units have heating requirements. When the indoor units in some rooms do not work, the opening degree of the electronic expansion valve of the non-operating indoor units is at 30 Left and right, as the compressor works, refrigerant will flow into the indoor unit. When the refrigerant accumulated in the indoor unit is large, it will affect the heating effect of other indoor units.

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