| 摘要 |
PROBLEM TO BE SOLVED: To properly start heating operation without impairing economic efficiency when the operation is performed by starting a part of a plurality of indoor units. SOLUTION: The temperature difference between supply air temperature and return air temperature to a use-side heat exchanger is calculated by a temperature difference calculating means 16 after starting the heating operation, the inability to start is judged when the temperature difference is not agreed with steady transition temperature difference which is judged to be a state transitable to a steady heating operation state, even after the lapse of a set time after the starting, a start inability signal is output from a start inability discriminating means 19, an indoor unit in a heating operation stop state is selected by a support indoor unit selecting means 20, and a start supporting signal is output to open an opening and closing valve 7 of the corresponding indoor unit. Thus the refrigerant liquid is released from a refrigerant gas pipe in an early stage by utilizing the indoor unit in the heating operation stop state, and the starting is performed and transited to the heating operation. COPYRIGHT: (C)2006,JPO&NCIPI |
