48 en | Planning FAS-420-TM Aspirating Smoke Detector
F.01U.088.878 | 4.1 | 2010.11 Operation Guide Bosch Sicherheitssysteme GmbH
3.7.4 Double U-pipe system
Double 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.
1 pipe system
FAS-420-TM
FAS-420-TM-R
FAS-420-TM-RVB
Figure 3.10 Double U-pipe system for space protection
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 12.5 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 8 units
Double U-Pipe
System
Air sampling
opening
Number of air sampling openings
48
Ø of air sampling
openings in mm
a
A4.4 3.0
B- 3.2
a
Punch diameter of the aspiration reducing film sheet
Double U-pipe system Number of obstructed air
sampling openings
Number of air sampling openings
48
Activation threshold
per pipe system
1 obstructed opening ± 15% -
2 obstructed openings ± 30% ± 15%
3 obstructed openings 0 ± 25%
4 obstructed openings 0 ± 35%
5 obstructed openings 0 0
6 obstructed openings 0 0
0 not practical / - not possible
BA
FAS / FCS
NOTICE!
When planning in accordance with EN 54-20, airflow monitoring must always be set to 20%.
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