| 摘要 |
PURPOSE:To allow indoor units to selectively, individually perform cooling operation, and also permit some of them to perform cooling operation and the others to perform heating operation at the same time, by a method wherein a first pressure detector is provided between a first manifold and a second flow control valve, a second pressure detector is installed between the second flow control valve and a fourth flow control valve, and third and fourth flow control valves are controlled so that the difference between the detected pressures is kept within a specified range. CONSTITUTION:A first pressure detector 25 is installed between a first manifold 10 and a second flow control valve 13, and a second pressure detector 26 between the second flow control valve 13 and a fourth control valve 17. Third and fourth flow control valves 15 and 17 are controlled so that the pressure difference DELTAP32 detected by the first and second pressure detectors is kept between the first target value DELTAPmd that is previously set larger than DELTAP1 and the second target value DELTAPmu that is previously set smaller than DELTAP2. |
