Bosch FAS-420-TM Series Aspirating Smoke Detectors LSN improved version: System OverviewSetting the Detector AddressInstalling the Unit

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

en

27

Bosch Sicherheitssysteme GmbH

F.01U.088.879 | 4.0 | 2010.12

System Overview Setting the Detector Address Installing the Unit

Figure 1

, 

Page 3

FAS-420-TM Series Connections

1

Connection for aspiration pipe

2

Connection for air-return pipe

3

Pre-punched M 25 cable entries for connection to fire panel or power supply (input/

output)

4

Pre-punched M 20 cable entries for connection to fire panel or power supply (input/

output)

Figure 2

, 

Page 3

FAS-420-TM Series Displays

1

Operating LED

2

Main alarm LED

3

Pre-alarm LED

4

Fault LED

5

Infrared  port

6

Fire source identification displays for areas A-E

7

10-segment smoke level display

Figure 3

, 

Page 3

The aspirating smoke detector's address is set using the 8-pin DIP switches on the printed 

circuit board and a suitable sharp object. The default address is "0" (all DIP switches set to 

"off"). The DIP switch settings for all approved addresses are listed on pages 

5

-

6

 (0 = off, 

1 = on).

Address 

(A)

Operating mode

Network structure

Loop

Stub

T-tap

0

Automatic address assignment in "improved 

version" LSN mode

X

X

-

1 to 254 Manual address assignment in "improved 

version" LSN mode

X

X

X

255 = CL Automatic address assignment in "classic" 

LSN mode (address range: max. 127)

X

X

-

x = possible

- = not possible

NOTICE! 

It is not permitted to use different operating modes in one loop/stub/T-tap next to each other.

WARNING! 

The equipment may only be installed by authorized and qualified personnel!

Switch off the unit before carrying out any connection work!

NOTICE! 

-

When selecting the installation location, it must be ensured that the unit displays are 

easily visible.

-

Remember when planning that the unit fans generate a noise level of approx. 40 dB(A).

-

The air outlet on the unit must not be obstructed. The distance between the air outlet 

and adjacent objects, e.g. a wall, has to be at least 10 cm.

-

The aspirating smoke detector can be installed with the suction device upwards or 

downwards (to do this, the detection unit cover must be rotated through 180°). If the 

aspiration pipe points downwards, make sure no impurities enter the air-return pipe 

which then points upwards.