U-Pipe System - Bosch FAS-420-TM Operation Manual

FAS-420-TM Aspirating Smoke Detector
I pipe system activation thresholds
I-pipe system
Activation threshold
0 not practical
Example:
If 2 of a total of 5 air sampling openings are found to be obstructed, airflow monitoring must
be set to ± 20% using the FAS-ASD-DIAG Diagnostic Software.
NOTICE!
When planning in accordance with EN 54-20, airflow monitoring must always be set to 20%.
3.7.2

U-pipe system

1 pipe system
FAS-420-TM
FAS-420-TM-R
FAS-420-TM-RVB
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
Bosch Sicherheitssysteme GmbH
Number of obstructed air
sampling openings
1 obstructed opening
2 obstructed openings
3 obstructed openings
4 obstructed openings
5 obstructed openings
Figure 3.8 U-pipe system for space protection
Pipe Ø 25 mm
Additional pipe Ø 12 mm
Pipe Ø 25 mm
Additional pipe Ø 12 mm
Operation Guide
Number of air sampling openings
2
± 30%
0
0
0
0
FAS / FCS
A B
Planning | en
3 4 5
± 20% ± 15% ± 10%
0 ± 30% ± 20%
0 0 0
0 0 0
0 0 0
C D
2 m
20 m
25 m
50 m
8 x 3 m
40 m
8 x 3 m
4 m
10 m
8 units
F.01U.088.878 | 4.1 | 2010.11
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