Setting The Fan Voltage; Setting The Fan Voltage (Sl Variant); Number Of Detector Modules - Bosch FAS-420-TT Series Operation Manual

78 en | Installing the Aspiration smoke detector
5.3.2

Setting the fan voltage

The standard fan voltage setting is 6.9 V. In critical applications, the fan voltage may be
switched to 9 V. This increases the transport speed in the pipe system, thus achieving faster
detection with longer pipe lengths.
To switch to 9 V, pull out jumper BR4.
(See , page 77 )
Fan voltage
6.9 V
9 V
X = pin pair bypassed, O = pin pair open
Caution!
Re-initialize the airflow if you switch the fan voltage. Close or open jumper BR4 only when the
!
unit is switched off.
5.3.3

Setting the fan voltage (SL variant)

For FAS-420 systems, the standard fan voltage setting is 6.9 V.
Caution!
For SL variants, always remove jumper BR4 from the motherboard.
!
Close or open jumper the jumpers BR1 and BR2 only when the device is switched off.
Re-initialize the airflow if you have switched the fan voltage.
The fan voltage on the fan activation circuit board on SL devices is set using the jumpers BR1
and BR2. The default setting is marked in bold.
Fan voltage with FC‑2
6.5 V
6.9 V
9 V
X = pin pair bypassed, O = pin pair open
5.3.4

Number of detector modules

The number of populated detector modules is factory set depending on the model variant
(jumper BR1 on the motherboard).
See , page 77 )
Variant
FAS-420-TP1 / FAS-420-TT1
FAS-420-TP2 / FAS-420-TT2
X = pin pair bypassed, O = pin pair open
2020.04 | 6.1 | F.01U.029.275
Jumper BR4, pin no. 1+2
X
O
Jumper BR1, pin no. 1+2
O
X
O
Number of detector modules Jumper BR1, pin no. 1+2
1 detector module
2 detector modules
Operation guide
Aspiration smoke detector LSN improved
Jumper BR2, pin no. 1+2
X
O
O
X
O
Bosch Sicherheitssysteme GmbH