| 摘要 |
PURPOSE:To control the unnecessary motion of a reheating device and to improve durability, by a method wherein, in an air conditioning device with an engine cooling water reheating device, a device for selecting introduction and shut off of cooling water to a heat exchanger before operation of a reheating device is provided. CONSTITUTION:From a chamber temperature 34, an open air temperature 36, a set temperature 38, a heat load is computed by a heat load calculating circuit 32 to control heating and cooling through comparison of the results with a reference value by means of comparators 40 and 42. When heating is needed, an output from the comparator 40 energizes a motor-operated pump 26 and an electromagnetic valve 28, with which a selecting device is formed, to circulate cooling water and drive a reheating device 30 through a delay circuit 46 and a gate 48. But, the gate 48 outputs an operating signal to the reheating device 30 only when a low temperature switch 50 is actuated and cooling water is needed to be reheated. This constitution enables control of unnecessary motion of the reheating device and improves durability. |
