| 摘要 |
An outdoor unit (A) has a compressor (1) and an outdoor heat exchanger (3). Each of a plurality of indoor units (B1, B2) has an indoor heat exchanger (12, 22). A plurality of gaseous flow adjustment valves (13, 23) are provided to the gaseous sides of the indoor units (B1, B2), respectively. A plurality of liquid expansion valves (11, 21) are provided to the liquid sides of the indoor units (BI, B2), respectively. A refrigerant super-heat degree detector (32-38) detects a refrigerant super-heat degree of the outdoor heat exchanger (3) or the indoor heat exchangers (12, 22). A controller controls a capacity of the compressor (1), optimally controls opening degrees of the gaseous flow adjustment valves (13, 23) in accordance with required capacities of the indoor units (B1, B2), and optimally controls the liquid expansion valves (11, 12) in accordance with a detection output from the refrigerant super-heat degree detector (32 - 38) such that the refrigerant super-heat degree becomes a predetermined value. The controller may include fuzzy logic. Further features relate to preventing refrigerant being quickly drawn by vacuum into the compressor (1), to recovering refrigerant from a stopped indoor unit, and to gradually increasing the opening degree of a flow adjustment valve when the number of operating indoor units is increased to eliminate noise. <IMAGE>
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