| 摘要 |
PROBLEM TO BE SOLVED: To improve a reliability in operation of a compressor by a method wherein an operating frequency of the compressor is controlled in response to a time and a discharging temperature when the compressor is started to operate. SOLUTION: A compressor 6 of which number of rotation is made variable in response to an operating frequency, an indoor device side heat exchanger 1, a pressure reducing device 2 and an outdoor device side heat exchanger 3 are connected in a ring-form so as to constitute a heat pump type freezing cycle. When the compressor 6 is started to operate, the operating frequency of the compressor 6 is held by a timer means 8 in a stepwise manner for a predetermined time until a target frequency of the compressor 6 is attained. After elapsing a desired time, the operating frequency is increased and in the case that a discharging temperature 5 exceeds a discharging temperature set value within a predetermined time, the operating frequency of the compressor 6 is increased up to the target number of rotation even in the set time. |
