Limits To Planning - Siemens FDA241 Technical Manual

4.5
Building Technologies
Fire Safety

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]
FDA221 0.14...20
FDA241 0.03...20
Branched pipes (symmetrical and asymmetrical U-topology)
Detector Sensitivity
[%/m obs]
FDA221 0.14...20
FDA241 0.03...20
Detector Sensitivity
[%/m obs]
FDA241 0.03...20
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]
Monitored
surface
Length of pipe
system
≤500 m ≤30 m
2
≤800 m ≤60 m
2
Monitored
surface
Length of pipe
system
≤500 m ≤2x 25 m
2
≤800 m ≤2x 60 m
2
Monitored
surface
Length of pipe
system
≤800 m ≤4x 30 m
2
Planning
Limits to planning
I-topology
Number of
aspirating holes
(Class A)
≤12
≤16
U-topology
Number of
aspirating holes
≤24
≤34
Double U-topology
Number of
aspirating holes
≤34
A6V10334410_h_en_--
2015-09-29
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