HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A–97
Overview of Construction, Movement
and Control of Major Parts of
Automatic Air Conditioner System
Automatic Heater/Air Conditioner Control
Unit
Equipped with the built-in micro-computer, this control
unit operates on signals from sensors and input signals
from switches to offer total control of the blower fan, and
actuators used for the mode door, intake door and air
mix door.
Its self-diagnosis function enables quicker access to a
failed part and its more accurate troubleshooting.
In Car Sensor
It is a sensor used for detecting room temperature of a
vehicle. This sensor converts a given room temperature
into a resistance value before entering the data to the
automatic heater/air conditioner control unit.
This in car sensor unites the power driven aspirator and
the motor fan so that a small amount of room air may be
constantly fed to the sensor.
This sensor is provided on the control panel.
865RX015
EndOFCallout
Ambient Sensor
This sensor is used for detecting temperature outside
the vehicle. It converts a given outside air temperature
into a resistance value before entering the data to the
automatic heater/air conditioner control unit.
Thermal effects from the condenser and radiator during
idling after a run can be measured and offset the
automatic amplifier.
This sensor is provided on the side plate situated at
upper right side of the condenser.
875RY00021
EndOFCallout
Duct Sensor
The duct sensor is the sensor to detect temperature
change of the side of evaporator blower coming by fresh
recirculation of intake door or “on" “off" of compressor.
The temperature is converted to resistant rate.
And it works as thermostat to control to prevent freezing
of evaporator.
This sensor is installed in the upper case of evaporator.
874RX014
EndOFCallout
Legend
(1) In Car Sensor
(2) Automatic Air Conditioner Control Unit
Legend
(1) Ambient Sensor
Legend
(1) Evaporator Core
(2) Duct Sensor
(3) Lower Case
(4) Upper Case