Bosch FAS-420-TM Operation Manual page 53

FAS-420-TM Aspirating Smoke Detector
Aspiration
To achieve optimal detection results, the pipe system should be organized into the areas v
to v
Installation location of the pipe system
The exhaust duct should be selected as the installation location of the pipe system, as far as
possible away from the sound dampers, air baffles and bends. The distance from obstacles of
this kind should be at least three times the smallest duct diameter.
If it is absolutely essential to install the pipe system directly behind air baffles, sound
dampers or bends; the main speed ranges must be monitored (see Figure 3.16/Figure 3.17).
Figure 3.16 Direction change of the duct without air baffles
1
Figure 3.17 Sound dampers in a duct
When installing a pipe system in air-conditioning ducts, the following must be observed:
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Bosch Sicherheitssysteme GmbH
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2 3 4
Since the FAS-420-TM and the pipe system are located in different pressure ranges, an
air return pipe (see Figure 3.18) must be provided.
The pipe entries into the duct must be airtight.
The portion of the pipe system that is outside the duct must be sealed airtight.
3 x d
min
2 3
5
Operation Guide
Planning | en
1 Main speed range
2
Exceptional arrangement of the
pipe system (if distance of
3 x d cannot be observed)
min
Typical pipe system
3
arrangement
Smallest duct diameter
d
min
1 Smoke aspiration pipe
2 Air-conditioning duct
3 Main speed range
4 Sound dampers
5 Bore
F.01U.088.878 | 4.1 | 2010.11
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