User Manual

11
Siemens Switzerland Ltd
Building Technologies Division
2.2.2. Elements
Figure 2.2.2-1 Setup of a fire detection system
Periphery Fire-related information is collected from all parts of the building by the input
periphery (automatic detectors, manual call points and input contacts) and
transmitted to the control unit.
The intelligent, automatic fire detectors detect and analyze the different fire
phenomena and automatically report the current hazard levels to the control
unit. When selecting the correct fire detector for each location (together with its
settings and placement), it is also crucial to consider the type of fire to be
expected, the room height, ambient conditions such as air changes and possible
deceptive phenomena.
Manual call points enable direct alarm activation by people who recognize an
incipient stage fire or smoke in their vicinity.
Contacts (e.g. from the activation of a sprinkler extinguishing system) report a
fire alarm indirectly.
Control unit The system is monitored, controlled and operated by the fire detection control
unit, which evaluates the hazard messages from the peripheral devices and
activates audible alarm warnings and fire control installations.
Actions The actions initiated by the control unit include alarming, activating the fire
controls and alerting the fire brigade. Optical and acoustic alarm devices warn
the people in the building. The activation of the preprogrammed fire controls
causes fire doors to be closed, and smoke and heat extraction
systems to be
activated, in certain cases extinguishing systems may also be activated.