| 摘要 |
PURPOSE:To improve the space heating ability of the air conditioner at the time of a low temperature space heating by detecting the temperature of an outdoor heat exchanger at the time of space heating and controlling the operational frequency of a compressor so that an outdoor heat exchanger does not frosted. CONSTITUTION:At the time of starting the space heating operation, a timer circuit contained in an LS 19 is turned ON, and counts the pulse of the frequency of a frequency oscillator 10 to compare a detected temperature (t) detected from a thermistor 6 with a set temperature T set by a resistor 8. If t>=T, a compressor 1 is operated at a frequency f1 by an output de ice using a power transistor 11, and a timer n becomes n + 1. Thus, counting advances. When the external air temperature is lowered and the outdoor heat exchanger becomes frosting and t<T, the compressor 1 is operated at a low frequency f2 to suppress the ability of the compressor 1 and increase the evaporation pressure. As a result, frost attached to the outdoor heat exchanger is molten. |
