Bosch FAS-420, Инструкции по эксплуатации

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Aspirating Smoke Detector Planning | en 39
Bosch Sicherheitssysteme GmbH Operation Guide 2018.04 | 2.0 | F.01U.130.926
The maximum total monitoring area, the maximum total pipe length and the maximum number
of air sampling openings depend on the selected planning. They are also dependent on the
restrictions imposed by national regulations.
Depending on the planning selected, some restricted values may apply.
The values for the maximum number of air sampling openings, the maximum pipe length and
the maximum overall monitoring areas apply for each pipe system. Two pipe systems can be
connected to aspirating smoke detectors FCS-320-TP2 and FCS-320-TT2, each with two
detector modules.
4.6 Standard Pipe Planning
In order to plan in accordance with the EN 54‑20 or ISO 7240-20 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.
4.6.1 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
– Detonation safety barrier
See Section Smoke Aspiration System Components, page 29 .
See also
– Smoke Aspiration System Components, page 29
– Smoke Aspiration System Components, page 29
4.6.2 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.
Procedure
In the following example , a plan with air filter with 8 openings, not fitted with any other
accessories, should satisfy class B. The red shaded areas show the potential plans with
different pipe shapes and fan voltage.