Aspiration smoke detector LSN improved Installing the Aspiration smoke detector | en 75
Bosch Sicherheitssysteme GmbH Operation guide 2020.04 | 6.1 | F.01U.029.275
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 (21.5V) and the lower operating voltage limits of the aspirating smoke detectors.
where
Lmax = Maximum line length in [m]
A = Strand cross-section in [mm²]
Ig = Total current of all connected aspirating smoke detectors in [A]
γ = Conductivity: Cu=57m/Ωmm²
ΔU = Charging current of the rechargeable batteries (80% of the nominal
capacity within 24hours) in [A]
To guarantee the impermeability of the housing, the corresponding cable bushing must be
selected for the existing cable:
– M25 cable bushing: ∅9-14mm
– M20 cable bushing: ∅8-12mm
The "Fire Alarm System Planning Software" enables case-specific calculations to be carried out
for planning the FPA-5000 Modular Fire Panel.
Refer to
– Technical specifications, page 27
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:
– 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 (230V/400V 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
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!
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