Overhead Console - freightliner cascadia Driver Manual

Natural Gas Vehicles
NOTICE
Silicone-based chemicals and cleaners will per-
manently disable the sensors. When cleaning the
vehicle, cover the sensors with a plastic cover-
ing. Keep the sensors covered until the area has
been cleared of any cleaning fumes.
Harsh chemicals, including some high alcohol
cotenant washer fluids, and extremely high tem-
peratures may damage the sensor.
Puncture of or damage to the seal located inside
the sensor housing will significantly shorten the
sensor life.
Frequent exposure to high concentrations of gas
will accelerate sensor deterioration.

Overhead Console

The overhead console consists of an alarm panel on
the right side and the control module on the left side.
The alarm panel has a green light, a red light, a
buzzer, and a sensor. See
within view from outside of the vehicle. The large
green light is continuously illuminated during normal
operating conditions.
Before entering the vehicle, always verify that the
green light is illuminated. If the green light is not illu-
minated, do not enter the vehicle. Complete the
alarm procedure previously outlined.
The alarm panel meets the California Highway Patrol
Title 13-2008 and NFPA 52 2010 requirements. All
drivers and technicians using it should be trained re-
garding the red and green lights, and the audible
warning.
The control module, located on the center of the
overhead console, contains the status lights and con-
trol buttons for the system. The areas that the sen-
sors monitor are defined as Zone 1 (cab), Zone 2
(engine compartment), and Zone 3 (sleeper, if
equipped). The control module has lights assigned to
each zone that will illuminate if a sensor detects a
trace level leak (between 20% and 30% LFL), a sig-
nificant level leak (above 50% LFL), or if a sensor is
disconnected or malfunctioning.
•
Trace Level: If either sensor detects gas fumes
at a concentration greater than 20% to 30%
LFL (1% gas in air by volume), the amber light
next to the Trace indicator for that zone will
25.7
Fig. 25.6. It is located
flash. There is no buzzer alarm for a trace
level detection, and the large green light on the
alarm panel will remain illuminated.
•
Significant Level: If either sensor detects gas
fumes at a concentration greater than 50% to
60% LFL (2.5% gas in air by volume), the
small red light next to the SIGNIFICANT indi-
cator for that zone will flash. After approxi-
mately 15 seconds, the large green light on the
alarm panel will switch off, the red light will illu-
minate, and the buzzer will sound. All alarm
indicators will remain on as long as fumes are
detected.
•
Sensor Fault: If the system detects that either
of the sensors has been disconnected or has
malfunctioned, an amber light next to the Sen-
sor Fault indicator for that zone will illuminate.
The control module also has buttons used to test or
reset the the control module after an alarm. Red
lights next to each button indicate when they are en-
gaged.
•
Shutdown Reset: If an alarm has been acti-
vated and the Relay Engaged light is illumi-
nated, the Shutdown Reset button will reset
the internal relay. Press the Shutdown Reset
button only after the gas has cleared, the
buzzer has turned off, and the alarm panel
light has returned to green.
•
Push To Silence: If an alarm has been acti-
vated, the Push To Silence button will silence
the buzzer.
See Table 25.2 for the functions of all lights and but-
tons on the overhead console.
Testing
Daimler Trucks North America strongly recommends
that all operators follow California Code of Regula-
tions (CCR) inspection requirements, regardless of
where the vehicle is operated. Per Title 13 CCR
935 (2), gas detection systems should be tested
three times per calendar year at equal intervals. The
testing procedure should simulate the same operat-
ing environment in which the vehicle is used, with the
same gaseous fuel.
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