Siemens FDA221, Technical Manual

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Planning
4
Limits to planning
43
Building Technologies A6V10334410_h_en_--
Fire Safety 2015-09-29
4.5 Limits to planning
Observe local regulations and specifications for the limits of the detection range of
the aspirating holes. The local regulations and specifications take priority over all
other information in this document.
The following limits are set for planning the pipe system depending on the
aspirating smoke detector used.
Single pipe
Detector Sensitivity
[%/m
obs]
Monitored
surface
I-topology
Length of pipe
system
Number of
aspirating holes
(Class A)
FDA221 0.14…20 ≤500 m
2
≤30 m ≤12
FDA241 0.03…20 ≤800 m
2
≤60 m ≤16
Branched pipes (symmetrical and asymmetrical U-topology)
Detector Sensitivity
[%/m
obs]
Monitored
surface
U-topology
Length of pipe
system
Number of
aspirating holes
FDA221 0.14…20 ≤500 m
2
≤2x 25 m ≤24
FDA241 0.03…20 ≤800 m
2
≤2x 60 m ≤34
Detector Sensitivity
[%/m
obs]
Monitored
surface
Double U-topology
Length of pipe
system
Number of
aspirating holes
FDA241 0.03…20 ≤800 m
2
≤4x 30 m ≤34
Adherence to the planning limits is verified by the ' FXS2055 ASD Asyst Tool'
software.

The maximum number of aspirating holes depends on the sensitivity and
whether it is a question of class A, B, or C. You will find these details in the
' FXS2055 ASD Asyst Tool' software (see also the table above).

In rooms where there is an increased risk (rooms with ventilation systems), the
size of the monitored area drops to 270…540 m² with the FDA241
(170…340 m² with the FDA221).
The maximum monitored area depends on the topology selected and the overall
maximum pipe length.
See also

Technical data for FDA241, FDA221 [➙ 105 ]