Subaru SVX 1992 Manual page 966

4-7 [M5F2] AUTOMATIC AIR CONDITIONING SYSTEM
2. FAN SPEED CONTROL
Auto amp.
IGN
B
AUTO switch
I 1 I I
ECON switch
1 1
I OFF
I
1
relay 1 I
Fan switch
1
I
DEF switch C
a~
a
1
t ° - ' "
.
E "
In-Vehicle sensor
o
o
'
I
n
o
a o
5
= i
Blower
M
Ambient sensor 1
I
a
O a 1
1
motor
Sun load sensor I
1 I
Water temp . sensor
1
I
1
I
I Fan
Evaporator sensor I control
I
I
HI lamp.
I I
I ~ I
1 1
I 1
relay -
I _ 1
Temp . adjust switch
I
Temperature setting 1
L------------------------J
C4-430
Fig. 69
1) Ordinary automatic air flow rate control
The auto amplifier varies the base voltage of the fan
control amplifier corresponding to the overall signal T,
thus steplessly controlling the fan motor speed.
The LO voltage varies with the air outlet position as
shown below .
y. , .,
Air outlet position Air flow LO voltage
VENT, BI-LEVEL 4 .5V
HEAT, DEF/HEAT 5 .5V
DEF 8 .0V
2) Heater start control
(1) The heater start control is performed correspond-
ing to the air outlet position . (This control is not
performed when VENT switch or DEF switch is se-
lected .)
The heater start control changes the air outlet and
warm-up air flow rate .
(2) If the water temperature is below 30°C (86°F), DEF
position and zero air flow are selected .
(3) If the water temperature is greater than 30°C
(86°F), DEF/HEAT position is selected and the air flow
rate is linearly increased from LO to AUTO level.
If the blower motor voltage is greater than 7 volts, the
air outlet will change to the HEAT position .
AUTO switch
ON
Water temperature
Less than
30°C (86°F)
Over 30°C (86°F)
Blower motor voltage OV Below 7V Over 7V
Air outlet DEF DEF/HEAT HEAT
The DEF/HEAT mode door position is only set in case
of heater start control.
32