Manual de operación de tablero 640 de notifier

Fire Alarm Control Panel

NFS2-640/E

Operations Manual

Document 52743
1/18/2010
Rev:
P/N 52743:E

E
ECN 10-249

Fire Alarm System Limitations
While a fire alarm system may lower insurance rates, it is not a substitute for fire insurance!
An automatic fire alarm system—typically made up of
smoke detectors, heat detectors, manual pull stations, audible
warning devices, and afire alarm control panel with remote
notification capability—can provide early warning of a developing fire. Such a system, however, does not assure protection
against property damage or loss of life resulting from a fire.
The Manufacturer recommends that smoke and/or heat detectors be located throughout a protected premise following the
recommendations of the current edition of the NationalFire
Protection Association Standard 72 (NFPA 72), manufacturer's
recommendations, State and local codes, and the recommendations contained in the Guides for Proper Use of System
Smoke Detectors, which are made available at no charge to all
installing dealers. These documents can be found at http://
www.systemsensor.com/html/applicat.html. A study by the
Federal Emergency Management Agency (anagency of the
United States government) indicated that smoke detectors
may not go off in as many as 35% of all fires. While fire alarm
systems are designed to provide early warning against fire,
they do not guarantee warning or protection against fire. A fire
alarm system may not provide timely or adequate warning, or
simply may not function, for a variety of reasons:
Smoke detectors maynot sense fire where smoke cannot
reach the detectors such as in chimneys, in or behind walls, on
roofs, or on the other side of closed doors. Smoke detectors
also may not sense a fire on another level or floor of a building.
A second-floor detector, for example, may not sense a firstfloor or basement fire.
Particles of combustion or “smoke” from a developing fire
may not reach the sensingchambers of smoke detectors
because:
•

Barriers such as closed or partially closed doors, walls, or
chimneys may inhibit particle or smoke flow.

•

Smoke particles may become “cold,” stratify, and not reach
the ceiling or upper walls where detectors are located.

•

Smoke particles may be blown away from detectors by air
outlets.

•

Smoke particles may be drawn into air returnsbefore
reaching the detector.

The amount of “smoke” present may be insufficient to alarm
smoke detectors. Smoke detectors are designed to alarm at
various levels of smoke density. If such density levels are not
created by a developing fire at the location of detectors, the
detectors will not go into alarm.
Smoke detectors, even when working properly, have sensing
limitations. Detectorsthat have photoelectronic sensing
chambers tend to detect smoldering fires better than flaming
fires, which have little visible smoke. Detectors that have ionizing-type sensing chambers tend to detect fast-flaming fires
better than smoldering fires. Because fires develop in different
ways and are often unpredictable in their growth, neither type
of detector is necessarily best and a given typeof detector
may not provide adequate warning of a fire.
Smoke detectors cannot be expected to provide adequate
warning of fires caused by arson, children playing with
matches (especially in bedrooms), smoking in bed, and violent
explosions (caused by escaping gas, improper storage of
flammable materials, etc.).

2

Heat detectors do not sense particles of combustion and
alarm only whenheat on their sensors increases at a predetermined rate or reaches a predetermined level. Rate-of-rise
heat detectors may be subject to reduced sensitivity over time.
For this reason, the rate-of-rise feature of each detector
should be tested at least once per year by a qualified fire protection specialist. Heat detectors are designed to protect
property, not life.
IMPORTANT! Smoke...