Method for judging proper amount of refrigerants for multi-united air conditioning unit

Abstract

The invention discloses a method for judging proper amount of refrigerants for a multi-united air conditioning unit, comprising the following steps of: after adjusting a four-way reversing valve (1) of the unit to a refrigeration mode and starting and running a compressor (2) of an outdoor unit for a period of time t, measuring an outdoor environment temperature T, the frequency f of the running compressor (2) and the exhaust pressure P0 of the compressor (2); and then comparing the exhaust pressure P0 of the compressor (2) with the standard region of an exhaust pressure corresponding to the outdoor environment temperature T and the frequency f of the running compressor (2), if the exhaust pressure P0 of the compressor (2) is positioned in the standard region, judging that the amount of the refrigerants is proper, if the exhaust pressure P0 of the compressor (2) is greater than the maximum of the standard region, judging that the amount of the refrigerants is too much, and if the exhaust pressure P0 of the compressor (2) is less than the minimum of the standard region, judging that the amount of the refrigerants is insufficient. The method is accurate, visualized and convenient.

Description

technical field [0001] The invention relates to a multi-connected air-conditioning unit, in particular to a method for judging whether the refrigerant of the multi-connected air-conditioning unit is appropriate. Background technique [0002] The multi-connected air conditioner unit in the prior art includes one or more outdoor units, a plurality of indoor units connected in parallel, and two refrigerant circulation main pipes connecting each indoor unit and each outdoor unit. If there is one outdoor unit, the outdoor unit is connected to multiple indoor units connected in parallel through two refrigerant circulation main pipes; if there are multiple outdoor units, multiple outdoor units are connected in parallel, and the parallel outdoor units pass through two refrigerant circulation main pipes Connect with the indoor units connected in parallel. [0003] Each outdoor unit includes compressor, oil separator, four-way reversing valve, outdoor heat exchanger (condenser in coo...

AI Technical Summary

Problems solved by technology

[0005] When the multi-connected air-conditioning unit is manufactured in the factory, refrigerant will be added according to the design requirements, but the amount of refrigerant added at this moment is an ideal value selected according to the design requirements. After the multi-connected air-conditioning unit is installed in a specific working environment, The customer may add or change the number of indoor units or outdoor units in the unit according to specific needs, or, due to the difference in the installation height of each indoor unit and outdoor unit in the working environment or even the change of the path and length of each refrigerant pipeline, the factory will be affected. The amount of refrigerant added in the air conditioner does not match the amount of refrigerant required for the actual operation of the air conditioning unit. Once there is more refrigerant, it is easy to liquid hit the compressor. If there is less refrigerant, the cooling and heating effect will not be good, and the compressor will be enlarged. , heat exchanger and other components of the load, wear, shorten the service life of the entire unit

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