Multiple-connecting air conditioner and control method thereof

Abstract

The invention relates to a multi-unit air conditioner and the controlling method thereof, in particular to that in a multi-unit air conditioner consisting of a plurality of outdoor units which are only provided with a compressor with variable capacity for each, the required capacity of the indoor unit can drive an outdoor unit alone through a low load dealt with by an outdoor unit, while in high load, all the outdoor units work by distributing the required capacity of indoor unit evenly, thereby minimizing the damage caused by changing and unloading of the minimum running capacity; even when the outdoor temperature is very low and the required capacity of indoor units is under a certain level, the reliability can be also be raised and the noise of outdoor units can be reduced.

Description

technical field [0001] The present invention relates to a multi-connected air conditioner and its control method, in particular to a multi-connected air conditioner using multiple outdoor units with variable capacity compressors and constant capacity compressors and its control method. Background technique [0002] In general, multi-type air conditioners are used to perform air conditioning for multiple indoor spaces, and are generally configured to connect multiple indoor units to one outdoor unit. However, recently, due to the trend of increasing the size of buildings, multiple indoor units are required at any time. Therefore, if you want to use one outdoor unit to cope with the cooling / heating load required by all indoor units, you must have a large-capacity and expensive compressor, which will cause an economic burden. [0003] For this reason, recently, multiple outdoor units are installed to automatically respond to changes in the load required by the indoor unit, and ...

AI Technical Summary

Problems solved by technology

[0009] However, in the case of operating at the minimum operating capacity, a decrease in electrical efficiency or mechanical efficiency is unavoidable compared to the case where both types of compressors are operating at the rated operating capacity

All outdoor units can operate at the minimum operating capacity when the required capacity of the indoor units is below a certain level, but in this case, the problem of lower overall electrical or mechanical efficiency is more serious

[0010] Also, when a cooling request is made when the outside air temperature is low, if the capacities of all the compressors are distributed, an appropriate high pressure for the refrigerant cycle cannot be formed, and it may happen that the refrigerant cannot be circulated normally

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