| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a controlling device of defrosting of an air conditioner which is designed in consideration of a difference in the condition of freezing of an outdoor- side heat exchanger according to outdoor air temperature. SOLUTION: This device is equipped with a temperature sensor 7 detecting a piping temperature of an indoor-side heat exchanger, a maximum temperature detecting part 21 detecting the maximum temperature out of the piping temperatures detected by the temperature sensor 7, a reference temperature storage part 22 storing beforehand a plurality of reference temperatures for switching a heating operation over to a defrosting operation so that they correspond to the maximum temperatures detected by the maximum temperature detecting part 21, a reference temperature setting part 23 which sets one applicable reference temperature out of the reference temperatures in a plurality stored in the reference temperature storage part 22, on the basis of the maximum temperature detected by the maximum temperature detecting part 21, and an operation control part 24 which compares the reference temperature set by the reference temperature setting part 23 with the piping temperature detected by the temperature sensor 7 and switches the heating operation over to the defrosting operation at the time when the piping temperature becomes the reference temperature or below.</p> |
