Remote Annunciators; Smoke Detectors; Spacing; Application Limitations - Siemens FC2025 Manual

FS20 Marine Fire Detection Control Panel
22

Remote Annunciators

The U.S. Coast Guard does not require remote Annunciation when the main control
panel is located on the navigation bridge; however, when the main control panel is
located in a fire control station, which is not a constantly attended space, a
supervised complete system status annunciator is required.

Smoke Detectors

22.1
Smoke detector is the generic name for photoelectric detectors; it senses visible
smoke. The marine detectors must have a metal plate to protect it from the weather.

Spacing

22.2
For average area with smooth ceiling and normal air movement, the maximum
recommended spacing is 900 square feet or no more than 30 feet between centers
and 15 feet from a sidewall. In area with higher air movement, the detector spacing
should be reduced accordingly.

Application Limitations

22.3
Description and Functions
On ceiling heights below eight feet, the possibility of unintentional alarms from
tobacco smoke does exist, especially in area where people might congregate. It is
recommended that smoke detectors in such area have their zones wired through
alarm confirmation module.
Description and Functions
Smoke detectors should not be used in area where they could be subjected to
steam or moisture condensation such as in galleys, laundries, etc. Thermal
detectors should be used in such area.

Thermal Detectors

22.4
Description and Functions
All thermal detectors respond only to excessive heat, which is assumed to be
generated from a flaming fire. The detectors are designed with different operating
principles:
22.4.1
The air temperature has to exceed the set rating of the devices in order to activate it.
The settings are 135°F - 190°F (57°C - 87°C) and higher (on special order).
112
Siemens Industry, Inc.
Building Technologies Division

Fixed Temperature

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Rate Compensated
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Fixed Temperature
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