| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an air conditioning system capable of recovering oil into a compressor from a refrigerant circuit by connecting a plurality of outdoor units in parallel with each of one or more indoor units. <P>SOLUTION: A control device of the air conditioning system causes a four-way valve to switch a flow channel of each outdoor circuit element into a refrigerating channel, stops each indoor fan, and controls the opening of each indoor expansion valve, the rotation of each compressor, and the rotation of each outdoor fan to the predetermined pressure-reducing opening, the predetermined compressor rotation, and the predetermined fan rotation in step S5 as the start of oil recovery operation. The predetermined pressure-reducing opening, the predetermined compressor rotation, and the predetermined fan rotation are set to keep the refrigerant from each indoor heat exchanger to each compressor overheated steam which is similar to moist steam. <P>COPYRIGHT: (C)2013,JPO&INPIT |
