| 摘要 |
PROBLEM TO BE SOLVED: To eliminate some defects found in the prior art that although a pre-defrosting operation is forcedly carried out before performing a defrosting operation until a room temperature becomes a higher value than a set temperature, if the room temperature does not drop well during defrosting operation, electrical power is consumed in a useless manner.SOLUTION: In the case where a defrosting operation in a previous time is operated within a prescribed operating time, frost generated at an outdoor heat exchanger is hardly removed and it is expected that an indoor air temperature is also decreased, so that a pre-defrosting operation is carried out before a defrosting operation of this time is performed and the room temperature is increased in advance to enable a loss of heating feeling to be prevented and at the same time in the case where the defrosting operation of the previous time is less than the prescribed time, the pre-defrosting operation is not carried out to enable a useless consumption of electrical power to be reduced.SELECTED DRAWING: Figure 2 |
