| 摘要 |
PROBLEM TO BE SOLVED: To perform defrosting operation when frosting on an outdoor heat exchanger happens upon heating operation of an air conditioner, and prevent drain water produced in the defrosting operation in the case of frequent frosting from being frozen. SOLUTION: At low fresh air temperature with the possibility of freezing and remaining frosting there is provided a time pattern for prohibiting defrosting where a set value of the next prohibition time of defrosting is shortened. There is further provided means for determining whether the time required for defrosting is long or short. If short, then the next prohibition time of defrosting is set with the foregoing pattern while if long, then the shortest time of the foregoing pattern is set as the next prohibition time.
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