Bosch FCS-320-TM Operation Manual page 14

14 en | Technical Specifications
Figure 2.6 Phase 2: Early fire detection
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Figure 2.7 Phase 3: Blowing out
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F.01U.130.928 | 1.0 | 2009.11
E
D
C
B
A
E
D
C
B
A
FAS-420-TM series
Phase 3
When the alarm is signaled, once the configurable pre-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
D
C
B
A
FAS-420-TM series
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 unit is measured.
On the basis of this time, the location of the smoke source can be accurately traced to
one of the monitored areas.
Operation Guide
FCS-320-TM Aspirating Smoke Detector
Bosch Sicherheitssysteme GmbH