Bosch FAS-420-TM Series Aspirating Smoke Detectors LSN improved version: LSN Configuration

FAS-420-TM | FAS-420-TM-R | FAS-420-TM-RVB

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Bosch Sicherheitssysteme GmbH

F.01U.088.879 | 4.0 | 2010.12

LSN Configuration

Once the aspirating smoke detector has been connected to the LSN, the detector and 

detector unit are configured using the fire panel programming software via a laptop connected 

to the fire panel. Information on the LSN configuration can also be found in the Online Help of 

the programming software.

Notes on diagnostics data for the fire panel are contained in the operation guide for the fire 

panel.

Parameter Settings via the Programming Software

The parameters for each detection unit are specified in the relevant "Sensor" dialog window 

via drop-down fields. The default settings are marked in bold below (see tables).

You can set the following parameters:

Detector module

Fire source identification

With the device variants FAS-420-TM-R and FAS-420-TM-RVB, it is possible to assign each of 

the five monitored rooms a designation. To do this, click the corresponding room and enter 

the designation for this room in the "Label" field. The designation can be a maximum of 31 

characters. In the event of a fire, this designation is displayed on the fire panel's operating and 

display unit, making it possible for the fire source to be clearly pinpointed.

Settings via the FAS-ASD-DIAG Diagnostics Software

The settings described below only refer to the device variants FAS-420-TM-R and 

FAS-420-TM-RVB.

NOTICE! 

The DM-TM-50 Detector Module is installed as standard in all FAS-420-TM Series devices and 

appears as a default setting. Please do not change this!

Sensitivity

Further Sensitivity

0.5%/m

A second sensitivity can be set, e.g. for day/

night mode. For adjustable sensitivity levels, 

see left.

1%/m

2%/m

Programmable*

Threshold for Airflow fault

Alarm delay

20%

10 sec

30%

30 sec

50%

60 sec

Programmable*

Programmable*

Airflow Fault Delay

Fan Voltage

LOGIC⋅

SEN

S Filter

30 sec

9 V

On

100 sec

10.5 V

15 min

12 V

Off

Programmable*

Programmable*

* Programmable

 = Choose this option to select further settings via the FAS-ASD-DIAG 

Diagnostics Software.

NOTICE! 

When the fire panel is in revision operation, the LOGIC⋅

SENS

 is temporarily deactivated, 

allowing the detector modules to be checked quickly and directly.

The default threshold for airflow fault is set to a change of airflow volume of 20%. Higher 

values are not allowed for installations according to EN 54-20.