| 摘要 |
PURPOSE:To enable successive control of cooling temperature by interrupting operation of a heating heat-exchanger in an operation mode which presents cooling with a cooling heat-exchanger operated at a low efficiency and by placing the actuation and interruption of the cooling heat-exchanger under the intermittent control according to the adjusted position of a damper. CONSTITUTION:When a selection switch 20 is operated into the second operation mode E-A/C, a relay coil 23 will not be powered and a hot water valve 11 is therefore closed so that a heater 5 will not fulfill the heating function. Since a relay coil 24 is then powered, a contact point 24a is closed so that a potentiometer 28 is connected to a thermistor 25 in the series relation. A resistance between an input point Q of a voltage comparison circuit 26 and the earth corresponds to the temperature which is virtually lower than the actual temperature at the lower side of an evaporator 3, hence fluctuated according to the position of a temperature control damper 4. A control circuit 22 may control the synchronism of the intermittent operation of a refrigerant cycle 19 so that the temperature at the lower side of the evaporator 3 may be higher than the reference temperature. |
