7-8 Safety Features and Equipment
DOB 1300-1556
PA-1639 Operator's Manual 2020 X3-45 Commuter
System Operation
Optical and thermal detectors are installed in the
vehicle engine compartment. When a fire is
detected, the system sends a fire alarm signal to
the display panel located in the driver’s overhead
area next to the destination sign control panel.
The display panel immediately turns on the fire
ALARM screen (an audio alarm and the vehicle
electric horn will also be heard). After a 15-
second time delay the engine is automatically
shut down and the fire extinguisher is discharged.
NOTE
The system monitors system integrity in real
time and displays the information via the
display panel screen. During normal operation,
a SYSTEM OK icon will be displayed to inform
the operator that all AFSS components are
working properly.
NOTE
The Manual Activation Switch is used when
immediate discharge of the fire extinguisher
and engine shutdown is desired.
Operational Sequence (Fire)
1. A fire optical or thermal detector detects a
fire in the engine compartment and sends a
signal to the Display Panel located in the
driver’s overhead area.
2. The fire alarm is activated; The Display
Panel screen turns red, the Fire Detection
icon is displayed and an audible beeping
alarm is heard (vehicle horn will also be
activated).
3. The HVAC shutdown activates immediately
(including defrost / defogger blower).
4. The
15
seconds
engine
shutdown
countdown starts and the time remaining
appears on the screen (the alarm sound will
accelerate as the timer approaches 0). The
SILENCE and DELAY buttons also appear
on the screen.
5. Unless advanced or delayed by the operator,
the system automatically shuts down the
vehicle
engine
and
discharges
the
extinguisher into the engine compartment at
the end of the countdown.
WARNING
The engine will stop 15 seconds after the fire
alarm starts. The operator must be prepared to
bring the vehicle to a safe stop as soon as the
alarm sounds.
l
If more time is required to stop the
vehicle, the operator can press the Delay
button on the panel display OR the
Engine Stop Override switch on the
dashboard to delay the engine shutdown
and
extinguisher
discharge
by
an
additional 15 seconds.
l
The delay function can only be activated
three times for a 45 seconds maximum
extension.
l
When one of the delay switch is pressed,
a new 15 second countdown will start
immediately.
To
use
the
maximum
allowable running time, activate the new
countdown at the very end of the current
one.
WARNING
At any time, the operator can press the Manual
Activation Switch located on the left window
pillar to terminate the countdown and proceed
to
the
immediate
engine
shutdown
and
extinguisher discharge.
WARNING
The extinguisher discharge may cause an
obscuring cloud behind and near the vehicle.
Summary of Contents for X3 Commuter
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