| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To securely determine the opening/closing state of operation valves during installation work regardless of the state of a heat exchange temperature sensor on the indoor unit side and the communication state between an outdoor unit and indoor units. <P>SOLUTION: In this multi-type air conditioner, the outdoor unit X and the indoor units A-C are interconnected via connection pipes 380-430. The outdoor unit X includes: liquid pipe temperature sensors St5, St7, St9 detecting temperatures of branch liquid pipes 200-220; gas pipe temperature sensors St6, St8, St10 detecting temperatures of branch gas pipes 290-310; and an operation valve opening/closing state determinator 440 calculating each of detected temperature differences between the temperatures of the branch liquid pipes 200-220 and the temperatures of the branch gas pipes 290-310 based on each detected temperature by the liquid pipe temperature sensors St5, St7, St9 and the gas pipe temperature sensors St6, St8, St10 during operation, and determining that the operation valves 260-280, 320-340 are closed when the respective detected temperature differences are a reference value or lower. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
