Multi-connected air-conditioning unit control method

Abstract

The invention discloses a multi-connected air-conditioning unit control method. A multi-connected air-conditioning unit comprises an air-conditioner main unit consisting of more than two outdoor units in parallel connection and an indoor unit, and the outdoor units include a main unit outdoor unit and an auxiliary unit outdoor unit which is used for precisely controlling power output of the outdoor units according to practical power requirements of the indoor unit. Alternation of the outdoor units and variable-frequency compressors of the outdoor units is complete by steps: firstly, judging whether system load Q is smaller than a set capacity Q2; secondly, judging whether the system load Q is larger than a set capacity Q1; and thirdly, judging whether the system load Q is larger than the set capacity Q2 and smaller than the set capacity Q1. By means of alternative control of full-variable-frequency compressors and automatic alternative control of the outdoor units, the outdoor units and the variable-frequency compressors of the outdoor units can be alternatively used while power output of the outdoor units is precisely controlled according to the practical power requirements of the indoor unit within a certain range of the system load, and thereby service lives of the multi-connected air-conditioning unit and the outdoor units are prolonged without adding any extra equipment.

Description

technical field [0001] The invention relates to a control method of a multi-connected air conditioner unit. Background technique [0002] In today's refrigeration and air-conditioning industry, the inverter multi-connected air conditioner is undoubtedly the mainstream product in the multi-connected market, and it is widely used. For frequency conversion multi-connected air conditioners, there are generally the following two deficiencies, which greatly shorten the service life of the unit. One is the long-term small load operation and the frequent start and stop of the indoor unit, which leads to the frequent start and stop of the frequency conversion compressor of the outdoor unit, which cannot return oil in time and is damaged, which directly shortens the service life of the unit; If one outdoor unit fails, the whole unit will stop working, which greatly reduces the reliability and stability of the multi-connected air conditioner outdoor unit. Therefore, it is necessary t...

AI Technical Summary

Problems solved by technology

One is the long-term small load operation and the frequent start and stop of the indoor unit, which leads to the frequent start and stop of the frequency conversion compressor of the outdoor unit, which cannot return oil in time and is damaged, which directly shortens the service life of the unit; If one outdoor unit fails, the whole unit will stop working, which greatly reduces the reliability and stability of the multi-connected air conditioner outdoor unit.

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