Siemens XC10 Series Operation - Page 14

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Extinguishing system overview

3.1

Extinguishing process

Building Technologies

Fire Safety

The automatic activation of extinguishing can be blocked as a precaution for

maintenance work. In this instance, in the event of fire, it is possible to press the

Manual Release Button for activation of extinguishing.

Mechanical blocking

For the safety of the people, the extinguishing can be blocked mechanically by

actuating the mechanical blocking device.

The following diagram describes the sequence of an extinguishing process under

normal conditions, i.e. without blocking device actuation and with factory settings.

Fig. 2

Extinguishing process sequence

An automatic extinguishing is enabled after the control unit has run through two

alarm levels - "Fire alarm" and "Activated".

If a detector detects a fire in the extinguishing area (zone 1 or 2), it triggers a "Fire

alarm". The alarm horn sounds slow pulsating and it can be silenced and the

system reset. The fire detectors from zone 3 monitor as a rule the areas adjacent

to the extinguishing area. Zone 3 can also be unused.

If yet another detector of the detector zones detects a fire outbreak in the

extinguishing area (one detector from each of zones 1 and 2) or if the manual

release button is activated (zone 4), the control unit goes over to the "Activated"

state. The alarm horn changes from slow to a pulsating tone. During this time, it is

not possible to silence / re-sound the sounders and all people must evacuate the

area to be flooded. The pre-warning time can be set to between 5 to 60 seconds.

After expiry of the pre-warning time, the releasing element (actuator) is triggered

and the flooding time begins. At the same time the illuminated warning panel is

activated, and the alarm horn changes from pulsating to a continuous sound. After

several seconds, the pressure switch at the cylinder bank reports the release of

extinguishing agent. From this point on, the alarm sounder(s) can be silenced. The

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2012-06