Installing The Aspiration Smoke Detector; General - Bosch FAS-420-TT Series Operation Manual

Aspiration smoke detector LSN improved
Line calculation
The maximum line length is derived from the permissible voltage drop on the supply line. The
permissible voltage drop is the difference between the end-point voltage of the backup
battery (21.5 V) and the lower operating voltage limits of the aspirating smoke detectors.
L
max
where
Lmax
A
Ig
γ
ΔU
To guarantee the impermeability of the housing, the corresponding cable bushing must be
selected for the existing cable:
–
–
The "Fire Alarm System Planning Software" enables case-specific calculations to be carried out
for planning the FPA-5000 Modular Fire Panel.
Refer to
–
5

Installing the Aspiration smoke detector

5.1

General

The regulations, guidelines and provisions described in Regulations apply.
The following must be observed when installing the FAS-420 Aspirating Smoke Detector:
–
–
–
–
Warning!
Installation must only be performed by authorized and specialized personnel!
!
Switch off the unit before carrying out any connection work!
Do not connect or disconnect the detector module while switched on!
Bosch Sicherheitssysteme GmbH
A
. .
γ
∆U
=
I . 2
g
= Maximum line length in [m]
= Strand cross-section in [mm²]
= Total current of all connected aspirating smoke detectors in [A]
= Conductivity: Cu=57 m/Ω mm²
= Charging current of the rechargeable batteries (80% of the nominal
capacity within 24 hours) in [A]
M 25 cable bushing: ∅ 9-14 mm
M 20 cable bushing: ∅ 8-12 mm
Technical specifications, page 27
Do not interfere with, modify or convert the equipment. If adjustments cannot be
avoided, consult with the operator, the unit manufacturer and/or the supply company.
All changes to the house mains (230 V/400 V supply) and to third-party systems must be
executed by the builder. This includes e.g.
Primary connection of the mains charger
Carrying out any potentially essential lightning and surge protection measures in
compliance with relevant standards
Installing the Aspiration smoke detector | en
Operation guide
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2020.04 | 6.1 | F.01U.029.275