| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of piping for transferring refrigerant, simplify piping construction work, and reduce consumption of piping, by connecting aggregated gas pipes of a plurality of outdoor units to one end of a common gas pipe, connecting the other end to indoor units, and permitting the plurality of outdoor units to be communicated with each other for keeping balance of oil supply amount between the outdoor units. SOLUTION: Individual liquid pipes 31 and gas pipes 41 of outdoor units 1a, 1b, and individual liquid pipes 32 and gas pipes 42 of indoor units 2a-2d are, respectively, connected to a common liquid pipe 3 and a common gas pipe 4. During cooling operation, a high temperature and high pressure gas discharged from a compressor of the outdoor unit 1a is subjected to heat exchange by an outdoor heat exchanger, and then, distributed to the individual liquid pipes 32 through the liquid pipe 31 and the common pipe 3. Further, a low pressure gas which has been subjected to heat exchange with indoor air by an indoor heat exchanger is merged into the common gas piping 4 through the individual gas pipes 42, and returned to the compressor of the outdoor unit 1a through the gas pipe 41. The outdoor units 1a, 1b are communicated with each other through a pressure equalizer 9 and an oil equalizer 10 thereby preventing unbalance of oil supply amount between the individual outdoor units 1a, 1b with respect to the compressors.
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