Air Filter; Installing The Air Filter Box; Air-Return Pipe - Bosch FAS-420-TM Operation Manual

72 en | Installation of the Pipe System
5.5

Air filter

5.5.1

Installing the Air Filter Box

Figure 5.6 Boring distances of holes in base of FAS-ASD-WS air filter box
Filter box
1.
2.
3.
4.
Installation material
Cylinder or flathead screws are suitable for wall mounting:
–
–
5.6

Air-return pipe

Figure 5.7 Installing the air-return pipe
Feed the air-return pipe into the designated pipe connection of the FAS-420-TM. The air-
return pipe fits perfectly in the connection and guarantees a firm hold.
NOTICE!
The pipe must be fixed immediately in front of the unit so that the pipe does not pull out of
the pipe connection due to any change in length that occurs (see Section 5.1 Length Change of
the Pipe System, page 68).
F.01U.088.878 | 4.1 | 2010.11
To use the filter box in the pipe system, use the two PG29 filter screw connections
supplied.
Install these cable glands in precisely the same way as for the pipe adapter, for example.
When installing the filter, note the throughflow direction, which is specified on the type
plate on the side of the lower part of the housing.
Screw the air filter housing directly onto the wall with the lower part of the housing.
Maximum thread diameter: 4 mm
Head diameter: 5 to 7 mm.
Operation Guide
FAS-420-TM Aspirating Smoke Detector
90
1 Air-return pipe (aspiration pipe)
1
Bosch Sicherheitssysteme GmbH