| 摘要 |
PURPOSE:To make a single water temperature switch alone serviceable enough, by constituting a blower motor so as to be selected to automatic control after making the blower motor rotate at low speed for the specified time long, when reflux water temperature rises and thereby a water temperature switch operates. CONSTITUTION:Even if an ignition switch IG is turned to ON, a heat mode select switch 13 is opened and a blower switch 20 is set to automatic control, temperature in inflow water to a heater 12 is low, and each of normally opened switches 51 and 92 of a water temperature switch 70 is in a state of being opened whereby a blower motor M is being stopped, thus cooling water is no longer blown off. When the water temperature switch 70 is closed as cooling water temperature rises with the heater 12, closing the normally opened switch 51 and operating a timer circuit 80 which comes into a state of interposingly installing a blower resistor 30, thus the blower motor M is made to rotate at low speed. After the elapse of time of the timer 80, a switch 92 is closed whereby a program switch 40 comes into a state of being operated and is selected to the automatic control. Thus, it makes a single water temperature switch alone serviceable enough in consequence. |
