Subaru 1600 Service Manual page 561

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HEATING, VENTILATING AND AIR-CONDITIONING SYSTEM
2) Vacuum System
The vacuum system's composition
is shown below. It utilizes engine
vacuum to operate the lever of the
carburetor linkage (F.I.C.D.) and the
changeover shutter in order to intake
internal compartment or exterior air.
1) When the air conditioner switch
is turned on, the air valve commu-
nicates between the source and the
actuator sides to operate the actua-
tor (F.I.C.D.). This pulls the lever
I ntake manifold
4
®
Fig. 13-47
(F.I.C.D.), which causes idling speed
to increase until the set value (950 ±
50 rpm) is reached.
2) If the control lever is CIRC-A/C.
MAX., the vacuum switch closes be-
tween the source and actuator sides,
thus passenger compartment air alone
is drawn into the unit.
If the mode lever is in a different
position, the vacuum switch is open
between both sides, so the actuator
operates, and exterior air is intro-
duced.
1 Actuator (F.I.C.D.)
2 Lever (F.I.C.D.)
3 Air valve
4 Connector
5
Check valve
@
6 Vacuum switch
7 Control lever
8 Actuator
@
9 Shutter
10 Vacuum hose
®
Outside air
®
A26-Q22
13-16
3) Electrical System
1) When the mode (control) lever is
set at "CIRC-A/C. MAX", "A/C", or
"DEF", the air conditioner switch
(microswitch) will be turned on. In
this condition, when the blower switch
is turned on, the blower relay, air
conditioner relay, and sub-fan relay
will activate. This in turn causes the
blower motor, air valve (F.I.C.D.),
compressor clutch, and sub-fan to
activate.
2) In addition, activating the pres-
sure switch (main fan control) or the
thermo switch will cause the main fan
to activate.
3) With the main fan in operation,
turning on the headlights will cause
the condenser fan (sub-fan) to stop.
4) When either the low pressure
switch or the thermostat activates, all
air conditioner circuits except the
blower motor will deactivate. In this
condition, however, when the temper-
ature of the coolant in the radiator is
high enough and the thermo switch
turns on, the radiator fan (main fan)
will activate.