Bosch FCS‑320‑TM Series Operation Manual page 13

Conventional Aspiration smoke detector
FAS-420-TM series
Figure 3.2: Phase 2: Early fire detection
–
FAS-420-TM series
Figure 3.3: Phase 3: Blowing out
–
Figure 3.4: Phase 4: Identification of fire source by reversing the fan's direction of flow
Bosch Sicherheitssysteme GmbH
E
10
9
D
8
7
C 6
5
4
B
3
2
A
1
E 10
9
8
D
7
6
C
5
4
B 3
2
A 1
Phase 3
When the alarm is signaled, once the configurable internal alarm threshold is reached, the
aspiration fan switches off and a second fan blows all smoke particles out of the pipe
system in the opposite direction.
E 10
9
8
D
7
6
C
5
4
B 3
2
A 1
Phase 4
Once the pipe system has been blown out, the direction of flow is reversed again and the
time required for the smoke particles to penetrate into the detection module is
measured. On the basis of this time, the location of the smoke source can be accurately
traced to one of the monitored areas.
E 10
9
8
D
7
6
C
5
4
B
3
2
A 1
E 10
9
8
D
7
6
C
5
4
B 3
2
A 1
FAS-420-TM series
Operation guide
Technical specifications | en
2020.04 | 2.1 | F.01U.130.928
13