Emergency Air Fill Valves And Quick Coupling Fittings - PREVOST X3-45 Commuter 2020 Operating Manual

Starting The Vehicle After A Fire Alarm
The vehicle may be started after a fire alarm
without resetting the system. Refer to ignition
switch sequence below. This will not reset the
system; rather it will instruct the vehicle's
multiplex system to ignore vehicle interface
outputs. This feature is intended to be used only
in emergencies that require the vehicle to be
restarted and moved a short distance prior to
system reset. It should not be performed if the
cause of the fire has not been clearly identified
and corrected.
To start the vehicle, perform these actions in
sequence.
Reset the AFSS from the AFSS panel.
l
Reset manual switch in rear junction box
l
(curb side of engine compartment).
Perform this switch sequence ON - OFF -
l
ON (within 2 seconds) then START the
vehicle.
FIGURE 11: IGNITION SWITCH SEQUENCE
EMERGENCY AIR FILL VALVES AND
QUICK COUPLING FITTINGS
The vehicle is equipped with three (3) air system
emergency fill valves to supplement the air
system when air pressure is low and the engine
cannot be operated.
Air system emergency valves are fitted with either
standard tire valve
pneumatic quick coupling fitting.
Air fill valves are as follows:
1- One quick coupling fitting and one air fill valve
fitted with standard tire valve stem located near
DOB 1300-1556
stem (Schrader) and
PA-1639 Operator's Manual 2020 X3-45 Commuter
Safety Features and Equipment 7-9
the engine air filter supply air for all systems
through the wet tank.
FIGURE 12: AIR FILL VALVE NEAR THE ENGINE AIR
FILTER
2- One air fill valve fitted with standard tire valve
stem located in the front service compartment
supplies air for the accessories, secondary, wet,
kneeling and parking brake overrule tanks.
FIGURE 13: AIR FILL VALVE IN FRONT SERVICE
COMPARTMENT
3- One quick coupling air fill fitting identified AIR
SUPPLY located behind the flip down hatch on
the front bumper supplies air from a tow truck for
all systems through the air dryer.
One quick coupling fitting identified BRAKE
located behind the flip down hatch on the front
bumper supplies air for the operation of the
vehicle service brake from the tow truck.