| 摘要 |
PURPOSE:To quickly eliminate a draft condition of room air conditioning due to a reduction in the blow air temperature by controlling the capacity of a room unit heat exchanger by controlling the opening of a room unit powered expansion valve in proportion to the difference between the set temperature and the intake air temperature, and reducing the room fan speed if the set temperature is lower than the predetermined value and the opening of the room unit powered expansion valve is smaller than the predetermined value. CONSTITUTION:During the operation under a heating mode, the opening of a room unit powered expansion valve is controlled by an opening control means 40 that receives signals from an intake air detecting means TH1 in proportion to the difference between the set temperature and the intake air temperature, and the capacity of a room unit heat exchanger 12 is controlled in response to the state of air conditioning in the room. If the set room temperature becomes lower than the predetermined value, the opening of the room unit powered expansion valve 13 is reduced. If it becomes smaller than the predetermined opening amount, the speed of a room fan 12a is reduced so as to reduce its air blowing rate by means of an air flow rate control means 41, causing the heat exchanging capacity of the room unit heat exchanger 12 to be reduced. This way, the draft condition can be prevented without causing a reduction in the blown air temperature.
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