Bosch FAS-420-TM - Page 47

FAS-420-TM Aspirating Smoke Detector Planning | en 47
Bosch Sicherheitssysteme GmbH Operation Guide F.01U.088.878 | 4.1 | 2010.11
M-pipe system activation thresholds
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.
Min. distance FAS-420-TM – 1st air sampling opening 2 m
Max. distance FAS-420-TM – 1st air sampling opening 20 m
Max. branch length 16.5 m
Max. total pipe length per pipe system
– Pipe Ø 25 mm 50 m
– Additional pipe Ø 12 mm 8 x 3 m
Max. total pipe length per pipe system for a fan voltage < 10.5 V
– Pipe Ø 25 mm 40 m
– Additional pipe Ø 12 mm 8 x 3 m
Min. distance between 2 air sampling openings (d) 4 m
Max. distance between 2 air sampling openings (d) 10 m
Max. number of air sampling openings (n) per pipe system 6 units
M-pipe system Air sampling
opening
Number of air sampling openings
36
Ø of air sampling
openings in mm
a
A5.0 3.6
B- 3.8
a
Punch diameter of the aspiration reducing film sheet
M-pipe system Number of obstructed air
sampling openings
Number of air sampling openings
3 6
Activation threshold
per pipe system
1 obstructed opening ± 30% ± 15%
2 obstructed openings 0 ± 30%
3 obstructed openings 0 0
4 obstructed openings 0 0
5 obstructed openings 0 0
6 obstructed openings 0 0
0 not practical
- not possible
NOTICE!
When planning in accordance with EN 54-20, airflow monitoring must always be set to 20%.