Bosch FAS-420-TM, Operation Manual, Page: 80 / 104

80 en | Commissioning FAS-420-TM Aspirating Smoke Detector
F.01U.088.878 | 4.1 | 2010.11 Operation Guide Bosch Sicherheitssysteme GmbH
6.5 Checking Malfunction Transmission
Malfunction transmission occurs as part of checking the airflow monitoring system (as per
section below).
Check whether, when a pipe breakage and an obstruction are detected, the malfunction is
displayed at the aspirating smoke detector and at the fire panel.
6.6 Checking Airflow Monitoring
Pipe breakage
Check the breakage detection:
1. Detach the pipe from the connection to the FAS-420-TM or open the test adapter.
2. Check whether the fault indication on the smoke aspiration system is flashing and
whether the malfunction is displayed on the fire panel.
3. Alternatively, check the data of the airflow sensor using the diagnostic appliance and a
PC or laptop.
4. Check whether the malfunction is displayed on the fire panel.
5. Enter the result in the test log.
Obstruction
Check the obstruction detection:
1. Close – depending on the planned airflow monitoring – the corresponding number of air
sampling openings with some duct tape.
2. Check whether the fault indication on the aspirating smoke detector is flashing and
whether the malfunction is displayed on the fire panel.
3. Alternatively, check the data of the airflow sensor using the diagnostic appliance and a
PC or laptop.
4. Check whether the malfunction is displayed on the fire panel.
5. Enter the result in the test log.
Troubleshooting
If the airflow malfunctions are not correctly detected by the unit, proceed as follows:
Check whether…
1. All borings are free
2. The pipe system has breaks or fractures
3. All pipe connections are tight
4. The fan can blow out freely
5. The correct aspiration reducing film sheets were used
6. Any test adapters and air filters are closed
7. Any filter inserts are clean
8. Any ball valves and blowing-out valves are in the operating position.
NOTICE!
The steps below may only be carried out following an airflow calibration in accordance with
Section 6.3 Calibrating the Airflow Sensor .
NOTICE!
The steps below may only be carried out following an airflow calibration in accordance with
Section 6.3 Calibrating the Airflow Sensor .