Auto

Control Unit:

Introduction - Auto Air Conditioner

The automatic temperature control (ATC) system provides automatic regulation of the discharged air temperature and the discharged air volume (Blower speed).

The air outlet door, intake door and compressor magnet clutch are controlled by the manual operation of each switch.

Features - Auto Air Conditioner

Air mix door control (Automatic temperature control) The air mix door is automatically controlled so that in-vehicle temperature will reach, and be maintained at the operator selected "set temperature". For a given set temperature, the air mix door position will depend on: Ambient temperature, in-vehicle temperature, amount of sunload, set temperature and A/C switch signals.


Fan Speed Control

When the fan control switch is in the Auto position, the blower speed is automatically controlled, depending on: Ambient temperature, in-vehicle temperature, amount of sunload, set temperature, and A/C switch signals. It is also controlled by the manual operation of the fan control switch.


Starting Fan Speed Control

When engine coolant temperature is low, the air outlet door position is detected by the microswitch and if this is set in B/L, FOOT or FOOT/DEF blower speed is controlled to prevent a large amount of cold air from being discharged into the floor area.


Outlet Door Control

This can be selected by operation of the mode switch.


Intake Door Control

This can be selected by changing the REC switch position.


Compressor Magnet Clutch Control

When the A/C switch is ON, the thermistor detects evaporator temperature. The thermo control amplifier controls clutch ON/OFF operation depending on the evaporator temperature.