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MODIFICATIONS TO THE ELECTRICAL INSTALLATION
Modifications to the electrical installation from chassis number 0E473500
3-30
20. HEATER FAN/ AIR-CONDITIONING SYSTEM
A voltage is applied to the heater fan switch
(C588) through the heater fan fuse (E031).
Depending on the position of this switch, the fan
will start operating.
The switch has five (5) positions:
Off:
Heater fan (B015) off.
Position 1:
Fan at lowest speed setting
(wire 4650), supply of heater
fan (B015) through three (3)
resistors.
Position 2:
Fan at somewhat higher
speed setting (wire 4651),
supply of heater fan (B015)
through two (2) resistors.
Position 3:
Heater fan in next to highest
speed setting (wire 4652),
supply of heater fan (B015)
through one (1) resistor.
Position 4:
Heater fan in highest speed
setting (wire 4653), relay
G065 now activated. This
relay connects the supply
(wire 1201) to wire 4654 and
the heater fan. The relay is
only activated in position 4 (full
supply voltage of heater fan
B015).
AIR-CONDITIONING SYSTEM
SHORT DESCRIPTION OF THE
RECIRCULATION VALVE
If switch C802 (air-conditioning recirculation
valve) is activated, a voltage is applied to point 1
of relays G257 and G258. As a result, pin 2 of
recirculation-valve motor B252 is connected to
earth and simultaneously pin 1 of B252 is
connected to the positive voltage. This will
activate motor B252 and close the recirculation
valve.
If C802 is not activated, no voltage is applied to
both relays G257 and G258. As a result, the
direction of flow of the current through motor
B252 is reversed and the recirculation valve will
open.
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