46
en | Planning
FAS-420-TM Aspirating Smoke Detector
F.01U.088.878 | 4.1 | 2010.11
Operation Guide
Bosch Sicherheitssysteme GmbH
U-pipe system activation thresholds
Example:
If 3 of a total of 8 air sampling openings are found to be obstructed, airflow monitoring must
be set to ± 25% using the FAS-ASD-DIAG Diagnostic Software.
3.7.3
M-pipe system
U-pipe system
Air sampling
opening
Number of air sampling openings
2
4
6
8
Ø of air sampling
openings in mm
a
A
6.0
4.2
3.4
3.0
B
-
4.4
3.6
3.0
C
-
-
3.6
3.2
D
-
-
-
3.2
a
Punch diameter of the aspiration reducing film sheet
U-pipe system
Number of obstructed
air sampling openings
Number of air sampling openings
2
4
6
8
Activation threshold
per pipe system
1 obstructed opening
± 25%
± 15%
-
-
2 obstructed openings
0
± 25%
± 20%
± 15%
3 obstructed openings
0
0
± 30%
± 25%
4 obstructed openings
0
0
0
± 35%
5 obstructed openings
0
0
0
0
6 obstructed openings
0
0
0
0
7 obstructed openings
0
0
0
0
0 not practical
- not possible
NOTICE!
When planning in accordance with EN 54-20, airflow monitoring must always be set to 20%.
1 pipe system
FAS-420-TM
FAS-420-TM-R
FAS-420-TM-RVB
Figure 3.9
M-pipe system for space protection
A
B
FAS / FCS
Summary of Contents for FAS-420-TM
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