FAS-420-TM Aspirating Smoke Detector
Installation of the Pipe System | en
71
Bosch Sicherheitssysteme GmbH
Operation Guide
F.01U.088.878 | 4.1 | 2010.11
5.4
Monitoring with Forced Airflow
5.4.1
Detection at Intake and Exhaust Openings
5.4.2
Detection in the Bypass
For details on connecting the air return, please see
Section 5.6 Air-return pipe, page 72
.
For FAS-420-TM planning in these applications, see
Section 3.9 Planning for forced airflow,
page 52
.
CAUTION!
If the smoke aspiration occurs in a forced airflow (fan, air-conditioning units), direct the air
sampling openings depending on the exhaust speed in the airflow (see
Figure 5.4
).
Figure 5.4
Positioning the air sampling opening depending on air
speed
1
Aspiration pipe with air sampling
openings
2
Exhaust speed < 0.5 m/s
3
Exhaust speed > 0.5 m/s
1
2
3
30°
Figure 5.5
Positioning the air-return pipe – example with an air-
conditioning duct (bypass)
1
Air-conditioning duct
2
Duct adapter
3
Aspiration
4
Air-return Pipe
b
Width of air-conditioning duct
1
2
3
4
b
1/2 b
Summary of Contents for FAS-420-TM
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