PURPOSE: To ensure comfortable and safe operation of a heat pump type heat exchanger, by raising the operation speed of a fan for preventing over-heating when the temperature of air ejected into a room to be air-conditioned is higher than a set temperature at the time of heating operation of the air conditioner, and lowering the operation speed of the fan to the original speed when the temperature of air is lowered after passing of a prescribed time.
CONSTITUTION: By means of a reference clock 1, a timer reference time in a program, temperature detected by a sensor 2 for detecting the temperature of air ejected from an indoor unit, and a control signal of a control switch 3 are afforded to a micro-computer 5. As a fan 7, one whose operation can be switched in three steps of "strong", "medium" and "weak" is used. When the air temperature 2 afforded to the micro-computer 5 becomes higher than a preset, over-heating preventing temperature, the computer 5 gives a signal for raising the fan speed by one step to a fan driving circuit 6 and increases the fan speed. The computer 5 compares the temperature detected by the sensor 2 with the set temperature at the intervals of a reference time period and lowers the fan speed to its original speed when the temperature drops. With such an arrangement, it is enabled to ensure comfortable and safe operation of the air conditioner.
SATOU YASUO
KAISE TOSHIAKI
HONDA YOSHIYUKI
KAMIMURA KAZUO
FUJII MANABU
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