Subaru SVX 1992 Manual page 959

AUTOMATIC AIR CONDITIONING SYSTEM [M5eol 4-7
5 . Automatic Climate Control
System
A: FEATURES
1 . ELECTRONICALLY CONTROLLED VARIABLE
DELIVERY COMPRESSOR
1) During the initial "cool-down" stage, air conditioning
is maximized to quickly bring the compartment to a
comfortable range .
2) During low ambient temperatures, compressor de-
livery is electronically controlled to effectively dehumid-
ify the compartment .
3) Compressor delivery is controlled to provide power-
saving when air conditioning is not required.
4) To maintain smooth engine operation when the A/C
switch is turned OFF, the compressor clutch is turned
OFF after compressor delivery is minimized .
5) When the engine coolant temperature is high, com-
pressor delivery is decreased with the A/C system in
operation to decrease the coolant temperature and thus
protect the engine .
2. AUTOMATIC COMPARTMENT TEMPERATURE
CONTROL
The air mix door is automatically controlled to maintain
an optimum compartment temperature regardless of
the ambient temperature, sunload or the number of
occupants .
3. AUTOMATIC SELECTION OF AIR OUTLET
The VENT, BILEVEL and HEAT mode doors are auto-
matically selected corresponding to the outlet air tem-
perature . Natural compartment ventilation can be
achieved by simply pressing the new VENT switch .
4. HEATER START CONTROL
To prevent cool air from discharging into the passenger
compartment during starts in cold weather, the air flow
rate is controlled between OFF and AUTO until the
heater water temperature increases. In this case, the air
outlet is controlled to change from DEF to AUTO
through DEF/HEAT in the AUTO mode .
5. COOLER START CONTROL
The cooler start control function controls the outlet air
quantity between OFF and AUTO levels until the evap-
orator cools down . This prevents blowing warm air into
the compartment when starting the air conditioner dur-
ing hot weather. (In AUTO mode operation)
6. SUN LOAD CORRECTION
The photo diode is adopted in the sun load sensor . This
provides accurate detection of sun load and ensures
proper correction of interior temperatures .
r B: SYSTEM CONTROL
I
Type of automatic control
Input unit
Output unit
AUTO switch, ECON switch, temperature adjust-
Room temperature control ment switch, in-vehicle sensor, ambient sensor, sun Air mix door actuating motor
load sensor, evaporator sensor
AUTO switch, ECON switch, temperature adjust-
Air flow rate control
ment switch, DEF switch, in-vehicle sensor, ambient
Blower fan motor fan control amplifier, HI relay
sensor, sun load sensor, water temperature sensor,
,
evaporator sensor, fan switch
AUTO switch, ECON switch, temperature adjust-
Mode door control
ment switch, DEF switch, in-vehicle sensor, ambient
Mode door actuating motor
sensor, sun load sensor, evaporator sensor, water
temperature sensor
AUTO switch, ECON switch, temperature adjust-
Intake door control
ment switch, DEF switch, CIRC switch, in-vehicle
Intake door actuating motor
sensor, evaporator sensor, ambient sensor, sun
load sensor, VENT switch
AUTO switch, ECON switch, temperature adjust-
ment switch, DEF switch, CIRC switch, in-vehicle
Solenoid actuator, compressor ON signal (output to
Compressor control sensor, ambient sensor, sun load sensor, evapora-
engine control unit)
for sensor, refrigerant temperature sensor, VENT
switch, ECU signal (Engine unit)
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