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

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

F.01U.088.879 | 4.0 | 2010.12

Bosch Sicherheitssysteme GmbH

1.

First, clearly mark the fixing points on the installation position provided on the 

equipment. To guarantee a safe and low-vibration hold, the housing base must be 

secured with four screws (? max. 4 mm).

2.

Fix the housing base to the surface by means of four screws in accordance with the 

mounting type. Make sure that the housing base is not fixed under mechanical tension 

and that the screws are not tightened too much. Otherwise, the device might be 

damaged or undesirable secondary noise may arise.

3.

Using a screwdriver, carefully punch out the required cable entries from the housing 

base.

4.

Carefully fit the cable entry/entries as required with M20 or M25 glands (1 x M25 and 

2 x M20 included in the delivery) by inserting them into the corresponding cable entry/

entries.

5.

Punch out the cable entries using a sharp object.

Caution: Do not cut the cable entries with a knife!

6.

Feed the connection cable(s) (max. cable cross section 2.5 mm²) through the suitable 

cable entry/entries into the device and cut to the required length inside the device.

7.

Wire the unit according to the connection information described below.

Connecting the FAS-420-TM Series

NOTICE! 

The units are usually connected to an additional power supply. When connecting to a Bosch 

fire panel LSN improved version, the voltage is supplied via the AUX outputs of the battery 

charger module. Alternatively, an external mains unit (e.g. FPP-5000 or UEV 1000) can be 

used.

Figure 4

, 

Page 4

Designation

Cable

Function

V+

Red

Additional power supply, incoming

V-

Black

V+

Red

Additional power supply, outgoing

V-

Black

a1-

White

LSN a, incoming

b1+

Yellow

LSN b, incoming

a2-

White

LSN a, outgoing

b2+

Yellow

LSN b, outgoing

Shield

-

Shield wire

Data+

-

Data line connection for digital external detector alarm 

display*

Data-

-

*Digital external detector alarm displays for the FAS-420-TM Series must be ordered 

separately.