| 摘要 |
PROBLEM TO BE SOLVED: To improve comfortability by preventing lowering of a physical feeling temperature before starting of defrosting operation. SOLUTION: When heating operation is started, a temperature Tno of an outdoor heat exchanger, a temperature Tni of an indoor heat exchanger, and the inclination angle of a wind direction plate is detected. When a direction of supply air in a room is other supply air direction than downward supply, and when the temperature Tno of the outdoor heat exchanger is decreased to a value lower than a first set temperature Ta, for example, -10 deg.C, defrosting of the outdoor heat exchanger is started. In case of a direction of supply air in a room being downward supply, the temperature of the outdoor heat exchanger is lower than a second set temperature, for example -5 deg.C, being higher by 5 deg.C than a first set temperature Ta and when the temperature of the indoor heat exchanger reaches temperature lower than a third set temperature Tc, for example, 38 deg.C, defrosting of the outdoor heat exchanger is started. |
