| 摘要 |
PURPOSE: To lower high refrigerant pressure and continue a heating operation by decreasing the capacity of a compression mechanism. setting heat source side fans to low air quantity and setting the opening of an expansion valve so as to lower evaporation capacity when high refrigerant pressure rises abnormally during a heating operation. CONSTITUTION: The high refrigerant pressure of a main refrigerant circuit 14 through which a heat source side unit A is connected to a using side unit B is detected by a pressure detecting means P1. At a prescribed time, a command for lowering the high refrigerant pressure of the main refrigerant circuit 14 is output from a command means 61. Further, when the high pressure controlling command is output from the command means 61, an executing means 62 sets a compression mechanism 1 to prescribed low capacity, respective heat source side fans 6a and 6b to prescribed low air quantity and the opening of an expansion valve 8 so as to lower evaporation capacity. Then, when the high refrigerant pressure reaches a low pressure state and a heating operation state reaches a high pressure completion state, a completion signal for high pressure control is output from a completion means 63 to the executing means 62. |
