Bosch FAS-420-TT Series - Page 49

Aspiration smoke detector LSN improved Planning | en 49
Bosch Sicherheitssysteme GmbH Operation guide 2020.04 | 6.1 | F.01U.029.275
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
A B C D E G
A B C D E G
U-pipe system for space protection
Limiting values Min. distance FAS-420 – T-fitting 4m
U-pipe system Max. distance FAS-420 – T-fitting 20m
Max. branch length
– With low fan voltage
– With high fan voltage
40m
50m
Max. overall pipe length per pipe system (Ø 25mm)
– With low fan voltage
– With high fan voltage
100m
120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 14
U-pipe system Air sampling opening Number of air sampling openings
2 4 6 8 10 12 14
Ø air sampling
opening in mm
a
A 5.2 3.6 3.4 3.2 2.5 2.5 2.0
B - 4.0 3.4 3.2 3.0 2.5 2.0
C - - 3.6 3.4 3.0 2.5 2.5
D - - - 3.4 3.2 3.0 2.5
E - - - - 3.2 3.0 3.0
F - - - - - 3.2 3.0
G - - - - - - 3.2
a
Punch diameter of the aspiration reducing film sheet