| 摘要 |
PURPOSE:To permit the cooling operation or the heating operation of each indoor machines selectively and simultaneously by a method wherein the amount of ventilation of a heat source machine side fan, solenoid opening and closing valves at both ends of a plurality of heat source machine side heat exchangers and the solenoid opening and closing valve of a heat source machine side bypass passage are controlled so that the detecting pressure of a fourth pressure detecting means, provided between the heat source machine side heat exchanger and a four-way valve, becomes a predetermined target pressure. CONSTITUTION:Upon principally heating operation, in simultaneous cooling and heating operation, the amount of ventilation of a heat source machine side fan 20 is regulated so that the detecting pressure of a fourth pressure detecting means 18 becomes a predetermined target pressure, a heat transfer area is regulated by opening and closing first, second, third and fourth solenoid opening and closing valves 44, 45, 46, 47 at both ends of first and second heat source machine side heat exchangers 41, 42 and the flow rate of refrigerant, conducted through the first and second heat source machine side heat exchangers 41, 42, is adjusted by opening and closing the solenoid opening and closing valve 48 of a heat source machine side bypass passage 43 whereby the arbitrary amount of heat exchange can be obtained in a heat source machine side heat exchanging unit 3. |
