CONTROLLING METHOD AND CONTROL CIRCUIT FOR HOT WATER COCK AND AIR MIX DOOR IN AUTOMATIC AIR CONDITIONER

摘要

PURPOSE:To prevent a useless motion of an air mix door and also to always enable a comfortable air conditioning resulting from the elimination of the change in temperature, by a method wherein a hot water cock can be opened before the air mix door is opened. CONSTITUTION:A bridge circuit 15 detecting an electric potential V0 of an output terminal 15c varying with changes in temperature is located in a control circuit which controls a hot water cock 7, adjusting hot water fed to a heater core 4, and controls an air mix door 5 regulating an airflow and a bypass airflow fed to the heater core 4. The hot water cock 7 starts to be opened by the bridge circuit 15 at a point of time when an electric potential V0 is slightly higher than an electric potential produced at a time when the air mix door 5 begins to open. A set temperature is changed by changing a resistance value of a variable resistance 13 and by changing an opening degree, of the air mix door 5, provided at a time when the electric potential V0 of the output terminal 15c becomes equal to an electric value V1 of an output terminal 15d.