Mounting/Installation; Mounting Principles - Siemens FDA241 Planning, Mounting

5 Mounting/Installation

5.1 Mounting principles

Building Technologies
Fire Safety
The pipe system should be completely planned before mounting and installing the
aspirating smoke detector and the electrical systems and equipment.
All piping must be installed according to local and national specifications and
guidelines.
The 'FXS2056 ASD Asyst Tool V2' software provides the following data of
relevance to installing the pipe system:
Position of the aspirating holes in the pipe system
Diameter of the aspirating holes
Diameter of the aspirating hole in every end cap
The air pressure at the aspirating smoke detector should be equal to or lower than
the air pressure in the room containing the aspiration system. Otherwise, pressure
equalization may occur as a result of the air being recirculated. You will find details
of the maximum monitored area in chapter 'Limits to planning [
The choice of topology affects the size of the monitored area. It is essential to
adhere to the authorized topologies and permissible dimensions. You will find
precise details in chapter 'Limits to planning [
– Branches and bends reduce the performance of the pipe system.
– Where systems involve multiple pipe branches, these branches should be
the same length if possible. This ensures a balanced airflow.
– Identical piping lengths and the number of aspirating holes are the key to
adjusting the airflow.
The size of the aspirating holes in the end caps can be used to control and
balance the airflow in the pipes.
Use the 'FXS2056 ASD Asyst Tool V2' software to calculate how to adjust the
airflow and what size the aspirating holes should be.
To prevent the pipes from sagging, they should be firmly secured at least once
every 2 m.
Use plastic pipes made from PVC or ABS with an inner diameter of 16...21 mm
(outer diameter 25 mm).
– An inner diameter of 16 mm is appropriate up to a pipe length of 20 m.
– An inner diameter of 20...21 mm is appropriate up to a pipe length of 60 m.
Use metal pipes if:
– Mechanical forces act on the pipe system
– Their use is stipulated by local regulations
– Heat, cold, or solvents would result in damage to a plastic pipe system
All pipe connections must be airtight.
The connection to the aspirating smoke detector must be detachable for
maintenance reasons and must not be glued.
If the climatic conditions in the monitored room change compared with what
was originally planned, the efficiency and reliability of the fire detection system
plus aspirating smoke detector will deteriorate. Such changes include:
– Different air pressure conditions in the room
– The installation of an air conditioning unit or ventilation system
– A change in the dust concentration
Mounting/Installation
Mounting principles
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2017-09-12
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