Bosch FCS‑320‑TM Series Operation Manual page 39

Conventional Aspiration smoke detector
–
–
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
U‑pipe system
Ø of air sampling
openings in mm
a
Punch diameter of the aspiration reducing film sheet
U-pipe system activation thresholds
U‑pipe system
Activation threshold
per pipe system
0 not practical
- not possible
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.
Notice!
When planning in accordance with EN 54‑20 or ISO 7240-20, 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
Air sampling
opening
A
a
B
C
D
Number of obstructed
air sampling openings
1 obstructed opening
2 obstructed openings
3 obstructed openings
4 obstructed openings
5 obstructed openings
6 obstructed openings
7 obstructed openings
Number of air sampling openings
2
6.0
-
-
-
Number of air sampling openings
2
± 25%
0
0
0
0
0
0
Operation guide
Planning | en
50 m
8 x 3 m
40 m
8 x 3 m
4 m
10 m
8 units
4 6
4.2 3.4
4.4 3.6
- 3.6
- -
4 6
± 15% -
± 25% ± 20%
0 ± 30%
0 0
0 0
0 0
0 0
2020.04 | 2.1 | F.01U.130.928
39
8
3.0
3.0
3.2
3.2
8
-
± 15%
± 25%
± 35%
0
0
0