Bosch FAS-420-TM - U-Pipe System

FAS-420-TM Aspirating Smoke Detector Planning | en 45
Bosch Sicherheitssysteme GmbH Operation Guide F.01U.088.878 | 4.1 | 2010.11
I pipe system activation thresholds
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.
3.7.2 U-pipe system
I-pipe system Number of obstructed air
sampling openings
Number of air sampling openings
2345
Activation threshold 1 obstructed opening ± 30% ± 20% ± 15% ± 10%
2 obstructed openings 0 0 ± 30% ± 20%
3 obstructed openings 0 0 0 0
4 obstructed openings 0 0 0 0
5 obstructed openings 0 0 0 0
0 not practical
NOTICE!
When planning in accordance with EN 54-20, airflow monitoring must always be set to 20%.
1 pipe system
FAS-420-TM
FAS-420-TM-R
FAS-420-TM-RVB
Figure 3.8 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 25 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
ABCD
FAS / FCS