Structure and function
Overview
3
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Building Technologies
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Fire Safety
2016-02-09
3 Structure and function
3.1 Overview
Figure 1: View of the FDS221
The alarm sounder FDS221 serves to provide an acoustic alarm in an addressed
fire detection system FS20/FS720.
The loud sound of the alarm sounder can be clearly heard as a danger signal when
a fire alarm sounds.
Eleven tones are programmed in the alarm sounder. Two tones can be activated
for different events (e.g. alarm and evacuation).
The alarm sounder is available in various colors:
FDS221-R with red hood
FDS221-W with white hood
Features
Addressed in FDnet/C-NET
Communication with the control panel via the detector loop
Supply via detector loop
Compatible with
– Addressable detector base FDB221/FDB221-AA
– Flat, addressable detector base FDB222
– Base attachment FDB291
– Base attachment wet FDB295
Integrated line separation function
Self test function
Sounds are synchronized with all alarm sounders and sounder bases
FDSB291 on the same detector line (product version 30 and higher)
