Airflow Monitoring; Malfunction Transmission; Maintenance Intervals - Bosch FAS-420-TT Series Operation Manual

108 en | Maintenance
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Caution!
It is essential that you adhere to the calibration type (air-pressure-dependent or air-pressure-
!
independent) and, if necessary, the values for air pressure, height above sea level, and set
voltage in the test log.
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Notice!
The diagnostic software can be used to save in file format all the stored and current data for
the device, as well as any settings made. To be able to compare the data read out, save each
file under a different file name.
8.6

Airflow monitoring

A pipe break or pipe obstruction is indicated for each detector module via the flash code of an
LED on the motherboard. Check the airflow monitoring in accordance with Checking Airflow
Monitoring.
8.7

Malfunction Transmission

A malfunction is indicated on the FAS-420 and on the fire panel, where applicable.
Proceed in accordance with Checking Malfunction Transmission.
8.8

Maintenance intervals

Maintenance comprises regular inspections and maintenance routines. The smoke aspiration
systems should be checked when commissioned and then quarterly. At each fourth check,
more comprehensive checks should be made, as described below:
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Inspection
Measure
Visual check
Detector module and alarm
transmission
Check the pipe system
Check the airflow sensor calibration
Checking Malfunction Transmission
Empty water separator (if necessary)
2020.04 | 6.1 | F.01U.029.275
If, during troubleshooting, the pipe network has been changed, the original configuration
of the pipe network must be restored after the troubleshooting has been completed and
the airflow must be recalibrated.
Observe the current airflow value during ongoing maintenance or check it at the latest
during the next inspection.
If the target value is similar to the previous one, disruptive environmental influences are
the cause of the deviation. If these negative influences on the airflow monitoring cannot
be suppressed, increase the airflow range.
Quarterly test/inspection
Annual test/maintenance + 4th annual inspection
Further information can be found in...
Visual check, page 102
Detector Module and Alarm Transmission, page
105
Pipe system, page 106
Check the airflow sensor calibration, page 106
Malfunction Transmission, page 108
FAS‑ASD‑WS Water Separator
Operation guide
Aspiration smoke detector LSN improved
Bosch Sicherheitssysteme GmbH