Testing
Daimler Truck North America strongly recommends that all operators follow California Code of Regulations (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 operating environment in which the vehicle is used, with the same gaseous fuel.
Table 1, Control Module Functions
|
Control Module Functions |
|||
|
Item |
Display |
Function |
Action Required |
|
Green Power Light |
Illuminated |
System is on. |
None required. |
|
Unlit |
Detection system is not functioning. |
Ensure the batteries are connected and replace any blown fuses. If the gas detection system is still not functioning, replace the system immediately. |
|
|
SIGNIFICANT Gas Concentration Lights |
Red (illuminated) |
Dangerous gas concentration detected. |
Suspend vehicle operation immediately and follow alarm procedures. |
|
Trace Gas Concentration Lights |
Amber (flashing) |
Minor gas concentration detected. |
Use caution and monitor the system. |
|
Sensor Fault Lights |
Off |
Sensor is functioning properly. |
None required. |
|
On |
Sensor has malfunctioned. |
Replace the sensor immediately. |
|
|
Shutdown Reset Button |
— |
Resets the system after an alarm activation. |
Press to reset the system only after the gas has cleared, the buzzer has turned off, and the alarm panel light has returned to green. |
|
Relay Engaged Light |
On |
Relay is engaged and test or alarm is being cleared. |
Press the Shutdown Reset button. |
|
Off |
Normal condition. |
None required. |
|
|
Test Button |
— |
Tests the overhead console operation and circuitry. |
Press and hold for one minute to to activate a test of all overhead console components. |
|
Silence Button |
— |
Silences the alarm buzzer. |
Press to silence the alarm buzzer. |
|
Silence Engaged Light |
On |
Indicates the buzzer is active but silenced. |
Suspend vehicle operation immediately and follow alarm procedures. |
|
Off |
Normal condition. |
None required. |
|
Table 1, Control Module Functions
Test results validating the performance of the gas detection system within the parameters established by the component manufacturer and NFPA 52 2010 should be maintained as a permanent part of the vehicle service records. Use of alcohol, propane, and other harsh liquids or gases are not acceptable methods for testing.
Always test the system and sensors after any component has been replaced, or if the vehicle has been involved in an accident or fire. Ensure that the gas detection system is wired directly to the battery.
It is recommended that the highest level of safety validation be utilized if there are multiple validation requirements in the state or locality where the vehicle is operated or domiciled.
Overhead Console Test
Press and hold the Push To Test button for one minute. The system will proceed with a self-diagnostic test that will include illumination of the Trace and SIGNIFICANT gas concentration lights, and the sensor fault lights. Verify the large red light and buzzer activate, and that all lights illuminate or flash to ensure that all bulbs are operational.
Sensor Test
The gas detection system sensors must be tested regularly by a trained technician, using certified test equipment that satisfies CCR § 935 (2) or NFPA 52 regulations.