Defrosting control method for multi-split air conditioning unit

Abstract

The invention belongs to the technical field of air conditioning units, and aims at solving the problem that the defrosting judgment accuracy of an existing multi-split air conditioning unit is not high. The invention provides a defrosting control method for the multi-split air conditioning unit. The defrosting control method comprises the following steps: in the process of executing a heating mode by the multi-split air conditioning unit, acquiring the air pipe temperature and the liquid pipe temperature of an indoor unit; calculating the difference value between the air pipe temperature and the liquid pipe temperature of the indoor unit; judging whether the multi-split air conditioning unit meets the outdoor side preset defrosting condition or not; and selectively enabling the multi-split air conditioning unit to execute a defrosting mode according to the difference value and the judgment result of whether the multi-split air conditioning unit meets the outdoor side preset defrosting condition or not. According to the defrosting control method for the multi-split air conditioning unit, the false defrosting condition of the multi-split air conditioning unit can be avoided, the defrosting judgment accuracy is improved, the heating effect of the multi-split air conditioning unit can be truly reflected, defrosting is carried out in time when the heating effect is poor, and the influence on the use experience of a user is avoided.

Description

technical field [0001] The invention belongs to the technical field of air-conditioning units, and specifically provides a defrosting control method for multi-connected air-conditioning units. Background technique [0002] The multi-connected air conditioner unit is a type of user's central air conditioner, commonly known as "one-to-many", which means that one outdoor unit is connected to two or more indoor units through piping. A primary refrigerant air conditioning system in the form of direct evaporative heat transfer. Multi-connected systems are currently being increasingly widely used in small and medium-sized buildings and some public buildings. [0003] In the prior art, during the heating operation of the multi-connected air conditioner unit, the outdoor unit may be frosted, and the frosting of the outdoor unit will greatly affect the heating effect of the multi-connected air conditioner unit, so it is necessary to defrost the outdoor unit. The traditional defrosti...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned problems in the prior art, that is, to solve the problem that the defrosting determination accuracy of the existing multi-connected air-conditioning unit is not high, the present invention provides a defrosting control method for a multi-connected air-conditioning unit, the multi-connected air-conditioning unit Including an outdoor unit and a plurality of indoor units connected to the outdoor unit, the defrosting control method includes: obtaining the temperature of the air pipe of the indoor unit and the temperature of the liquid pipe of the indoor unit during the process of performing the heating mode of the multi-connected air conditioner unit; calculating the temperature of the indoor unit The difference between the air pipe temperature of the indoor unit and the liquid pipe temperature of the indoor unit; determine whether the multi-connected air conditioner unit meets the predetermined outdoor defrosting conditions; Make multi-connected air conditioner units execute defrosting mode

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