Bosch FAS-420-TT Series - Technical Data

Aspiration smoke detectors LSN improved Technical data | en 25
Bosch Sicherheitssysteme GmbH Quick installation guide 2020.04 | 5 | F.01U.029.274
2. To initialize the connected pipe system, press the S2 flow-init button on the detector
module concerned until the green operating LED on the unit starts to flash.
The initialization is complete after approx. 10 seconds. Following successful initialization, the
operating LED lights up permanently. No further modifications may be made to the pipe
system during or after initialization. The fan voltage must also remain unchanged following
initialization. Otherwise, the initialization procedure must be repeated.
Troubleshooting Using Flash Codes
Malfunctions and unit statuses are displayed using flashcodes:
– By means of an LED on the detector module
– By means of one or two LED(s) on the unit motherboard (one LED per detector module).
LED flash code on detector module
1 flash Airflow initialization active (flow-init)
2 flashes Airflow too small (obstruction)
3 flashes Airflow too large (pipe breakage)
4 flashes Unit upload (approx. 2min)
Permanently lit Detector faulty
LED flash code on the motherboard (LED1/LED2)
1 flash Error: internal voltage monitoring 1
2 flashes Error: internal voltage monitoring 2
3 flashes Error: fan voltage monitoring
4 flashes Error: air pressure correction voltage monitoring
5 flashes Software error
6 flashes Internal error 1
7 flashes Internal error 2
8 flashes Unit upload (approx. 2min)
5 Technical data
FAS‑420 Aspiration smoke detector series
Electrical
LSN power supply 15VDC-33VDC
Auxiliary power supply 14VDC-30VDC
LSN current consumption 6.25mA
Current consumption from auxiliary power supply
(at24V)
FAS-420-TP1
FAS-420-TT1
FAS-420-TP2
FAS-420-TT2
– Starting current, fan voltage 6.9V 400/400mA 400/400mA
– Starting current, fan voltage 9V 400/400mA 400/400mA
– On standby, fan voltage 6.9V 210/210mA 245/250mA