Bosch FAS-420-TM, Operation Manual

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FAS-420-TM Aspirating Smoke Detector Planning | en 39
Bosch Sicherheitssysteme GmbH Operation Guide F.01U.088.878 | 4.1 | 2010.11
3.6 Standard Pipe Planning
In order to plan in accordance with the EN 54-20 standard, certain factors must be known,
such as the system sensitivity requirements, the number of air sampling openings and the
accessories needed for the application concerned. These factors can be used to determine
the appropriate standard-compliant construction of the pipe system using the following
chapter and the planning table in the appendix.
3.6.1 Determining the Necessary Accessories
As accessory components, e.g. filters, have a particular effect on the dimensions of pipe
planning, the appropriate accessory must be selected for the application concerned in
advance. Retrofitting an accessory, e.g. a fine filter, is largely only possible if a certain reserve
is planned in advance.
The following components must be taken into account in this regard:
– Air filter
– Water separator
– Three-way-tap
See 2.8.3
3.6.2 Pipe Planning with Pipe Accessories
For the purpose of pipe system planning, the following planning table is available for all
selected pipe accessories.
– Planning without air filter
– Planning with FAS-ASD-FL air filter
NOTICE!
In order to improve the detection quality of a smoke aspiration system, an area can be
monitored with more detection points than required by national guidelines. However, to
calculate the necessary sensitivity of an aspirating smoke detector, the number of aspiration
points required by the standard must be used.