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

48 en | Planning
3.7.4

Double 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
a
Punch diameter of the aspiration reducing film sheet
Double U-pipe system activation thresholds
Double 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, airflow monitoring must always be set to 20%.
F.01U.088.878 | 4.1 | 2010.11
Figure 3.10 Double U-pipe system for space protection
Pipe Ø 25 mm
Additional pipe Ø 12 mm
Pipe Ø 25 mm
Additional pipe Ø 12 mm
Double U-Pipe
System
Ø of air sampling
a
openings in mm
Number of obstructed air
2 obstructed openings
3 obstructed openings
4 obstructed openings
5 obstructed openings
6 obstructed openings
B A
Air sampling
opening
A
B
sampling openings
1 obstructed opening
Operation Guide
FAS-420-TM Aspirating Smoke Detector
FAS / FCS
Number of air sampling openings
4
4.4
-
Number of air sampling openings
4
± 15%
± 30%
0
0
0
0
Bosch Sicherheitssysteme GmbH
2 m
20 m
12.5 m
50 m
8 x 3 m
40 m
8 x 3 m
4 m
10 m
8 units
8
3.0
3.2
8
-
± 15%
± 25%
± 35%
0
0