Subaru SVX 1992 Manual page 955

AUTOMATIC AIR CONDITIONING SYSTEM [M4016] 4-7
15 . FAN CONTROL AMPLIFIER
The fan control amplifier is installed on the cooling unit .
It receives the base current from the auto amplifier, and
controls the voltage applied to the fan motor.
Evaporator
1 2
3
L- _
3
Fan control amplifier
C4-413
Fig. 52
16 . RELAYS
1) Max . HI relay
The MAX HI relay is installed on the blower unit case . It
is turned ON and OFF by the signal sent from the auto
amplifier. When the MAX. HI relay is turned ON, the fan
motor generates maximum air flow .
Normally, the air flow is controlled by the fan control
amplifier. Because the fan control amplifier itself causes
a small amount of voltage drop, the MAX HI relay is
turned ON when generating maximum air flow .
2) OFF relay
The OFF relay is installed on the blower unit . This relay
turns ON by the signal sent from the auto amplifier
when the control panel switch is pressed . When the OFF
relay is ON, the fan motor power supply is connected .
When OFF relay is OFF, the fan motor power supply is
disconnected .
p O / IGN B
P P
OFF relay OFF relay
14 14
33
- 4
2 1 2
I
Blower
M motor
Auto
amp.
I '
OFF relay
Fan
I
relay
-
control
amp.
HI relay
C4-414
Fig . 53
21