Bosch FAS‑420‑TP Series - Page 52

52 en | Planning Aspiration smoke detector LSN improved
2020.04 | 6.1 | F.01U.029.275 Operation guide Bosch Sicherheitssysteme GmbH
Double U-pipe system - single-hole monitoring
1 pipe system
FAS-420-TP1
FAS-420-TT1
2 pipe systems
FAS-420-TP2
FAS-420-TT2
FAS / FCS
FAS / FCS
C
C
B
B
A
A
Double U-pipe system for space protection
Limiting values Min. distance FAS-420– last T-fitting 4m
Double U-pipe Max. distance FAS-420 – last T-fitting 20m
Max. branch length
– With low fan voltage
– With high fan voltage
20m
30m
Max. overall pipe length per pipe system (Ø 25mm)
– With low fan voltage
– With high fan voltage
100m
140m
Min. distance between 2 air sampling openings 4m
Max. distance between 2 air sampling openings 12m
Max. number of air sampling openings (n) per pipe system 12
Double U-pipe Air sampling opening Number of air sampling openings
4 8 12
Ø air sampling
opening in mm
a
A 4.0 3.0 2.5
B - 3.4 3.0
C - - 3.0
a
Punch diameter of the aspiration reducing film sheet
Double U-pipe system activation thresholds per pipe system
Activation
thresholds
Number of openings 4 8 12
1 obstructed opening I — —
2 obstructed openings II I —
3 obstructed openings 0 II I