| 摘要 |
<p>A single outdoor unit has at least an inverter circuit, a compressor motor, a variable capacity compressor, and an outdoor heat exchanger. A plurality of indoor units each have at least an indoor heat exchanger and an air-conditioning load detector. A distribution unit couples the single outdoor unit to the plurality of indoor units in parallel by liquid-side refrigerant piping and gas-side refrigerant piping, to form a refrigerating cycle of a heat pump type. The liquid-side refrigerant piping includes a motor-operated flow regulating valve and pressure reducer, which are connected in series fashion. A pseudo-refrigerant superheating state detector detects a pseudo-refrigerant overheating state on the basis of the temperature of the refrigerant in the aggregated portion of gas-side refrigerant piping of the distribution unit. A first controller respectively controls the open factors of the motor-operated flow regulating valves. A second controller computes a total amount of the contents of the predetermined frequency data corresponding to a total air conditioning load of the indoor heat exchangers and controls the output frequency of the inverter circuit according to the total amount. A third controller incrementally controls the open factor of the motor-operated flow regulating valves to a value larger than the current value, on the basis of the detection result of the pseudo-refrigerant superheat state detector.</p> |
