Bosch FAS-420-TM Operation Manual page 47

FAS-420-TM Aspirating Smoke Detector
Min. distance FAS-420-TM – 1st air sampling opening
Max. distance FAS-420-TM – 1st air sampling opening
Max. branch length
Max. total pipe length per pipe system
–
–
Max. total pipe length per pipe system for a fan voltage < 10.5 V
–
–
Min. distance between 2 air sampling openings (d)
Max. distance between 2 air sampling openings (d)
Max. number of air sampling openings (n) per pipe system
a
Punch diameter of the aspiration reducing film sheet
M-pipe system activation thresholds
Activation threshold
0 not practical
- not possible
Example:
If 1 of a total of 6 air sampling openings is found to be obstructed, airflow monitoring must be
set to ± 15% using the FAS-ASD-DIAG Diagnostic Software.
NOTICE!
When planning in accordance with EN 54-20, airflow monitoring must always be set to 20%.
Bosch Sicherheitssysteme GmbH
Pipe Ø 25 mm
Additional pipe Ø 12 mm
Pipe Ø 25 mm
Additional pipe Ø 12 mm
M-pipe system
Ø of air sampling
a
openings in mm
M-pipe system Number of obstructed air
per pipe system
2 obstructed openings
3 obstructed openings
4 obstructed openings
5 obstructed openings
6 obstructed openings
Air sampling
opening
A
B
sampling openings
1 obstructed opening
Operation Guide
Number of air sampling openings
3
5.0
-
Number of air sampling openings
3
± 30%
0
0
0
0
0
F.01U.088.878 | 4.1 | 2010.11
Planning | en 47
2 m
20 m
16.5 m
50 m
8 x 3 m
40 m
8 x 3 m
4 m
10 m
6 units
6
3.6
3.8
6
± 15%
± 30%
0
0
0
0