Environmental Influences; Blowing-Out Unit - Siemens FDA241 Technical Manual

Planning
4

Environmental influences

4.6
4.7
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Building Technologies
Fire Safety
Environmental influences
If the devices are used in industrial applications, consultation with the project
manager is required, since plastics do not withstand certain environmental
conditions.
The following factors must be taken into consideration:
Chemicals

Temperature

Moisture

Fluctuations in air pressure, e.g. in well aerated rooms


Blowing-out unit

Deposits at the aspirating holes affect air aspiration and have the potential to
trigger an alarm. The pipe system should be blown out to purge it. To do this,
compressed air is introduced into the pipe system. The compressed air clears
deposits from the aspirating holes and capillary tubes. The aspirating smoke
detector features an output for the purpose of controlling a blowing-out unit.
Always ensure that the blowing-out unit used for blowing out is suitable.
Find out about any local regulations.
Blowing out unit requirements
The blowing-out unit must be approved in accordance with local regulations.

The aspirating smoke detector must not be subject to pressure.

– No compressed air is permitted to enter the aspirating smoke detector
during blowing out.
– The blowing-out unit must feature suitable valves.
– For blowing out purposes, it must be possible to disconnect the pipe
system from the aspirating smoke detector.
Once blowing out has been performed, it must be possible to reconnect the

pipe system to the aspirating smoke detector.
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2015-09-29