| 摘要 |
PURPOSE:To obtain a defrosting control device capable of being simplified by a method wherein heating operation is effected after the temporary stop of the operation of a compressor from the restarting of the operation to a time when a predetermined time has elapsed while defrosting operation is controlled by a comparison between a boundary temperature in accordance with the memorized frequency of an power source and a detected temperature after the predetermined time has elapsed. CONSTITUTION:When an outdoor side heat exchanger 5 has not frosted yet, both of the suction refrigerant temperature Ts of a compressor 1 and the inlet pipeline temperature (t) of an indoor side heat exchanger 3 are high, however, these temperatures are reduced gradually and when the outdoor side heat exchanger 5 is frosted, heating capacity is reduced remarkably and the inlet pipeline temperature (t) of the indoor side heat exchanger 3 is reduced extremely. When the inlet pipeline temperature (t) has become lower than a set pipeline temperature (t1), the heating capacity is reduced and frosting is advanced, therefore, the heat exchanger 3 is defrosted. Generally, the inlet pipeline temperature (t) of the indoor side heat exchanger 3 is different depending on whether the titled machine is operated under 50Hz or 60Hz, therefore, the decision of a defrosting should be effected only by switching in accordance with the operating frequency of 50Hz or 60Hz to realize the heating capacity sufficiently. Accordingly, the proper decision of defrosting operation may be effected with the inlet pipeline temperature of the indoor side heat exchanger 3 under the operating frequency of 50Hz or 60Hz.
|
