SilentKnight SK-5208 Conventional FACP 10-30 Zone - Manual (Page 7)

Model SK-5208 Installation Manual 151204
1-2
1.3.1 Optional Accessories
Limitations of Fire Alarm Systems
Manufacturer recommends that smoke and/or heat detectors be located throughout a protected premise following
the recommendations of the current edition of the National Fire Protection Association Standard 72 (NFPA 72),
manufacturer’s recommendations, State and local codes, and the recommendations contained in Guide for the
Proper Use of System Smoke Detectors, which is made available at no charge to all installing dealers. A study by
the Federal Emergency Management Agency (an agency of the United States government) indicated that smoke
detectors may not go off or give early warning in as many as 35% of all fires. While fire alarm systems are
designed to provide 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. For
example:
• Particles of combustion or smoke from a developing fire may not reach the sensing chambers 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 returns before reaching the detector.
In general, smoke detectors on one level of a structure cannot be expected to sense fires developing on another
level.
• 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. Detectors that 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
Table 1-1: Compatible Modules Manufactured by Silent Knight
Model What It Does
SK-5217 Zone Expander Adds 10 zones to the SK-5208 for a total expansion of the system to 30 zones.
SK-2190 Accessory Cabinet Used for remote mounting of the SK-5217 Zone Expander.
Dimensions: 10-3/8”W x 10-3/16”H x 3”D (26.35 cm W x 25.88 cm H x 7.62 cm D)
5220 Direct Connect Module For direct alarming and trouble transmission from the SK-5208 to a supervising
station.
SK-5235 Remote Annunciator For remote annunciation, operation, and on-site programming.
SK-5280 The Model SK-5280 Status Display module provides outputs and control functions for
remote annunciation of alarm, trouble, and supervisories for each zone.
5824 Provides connectivity to a Serial or Parallel printer. (See Section 4.2.12 for
programming.)
SK-5499 Signal Power Expander Notification circuit power for additional notification appliances. Provides additional
9A of 24 VDC, supervised.
SK-5495 Signal Power Expander Notification circuit power for additional notification appliances. Provides additional
6A of 24 VDC, supervised.
SKSS Downloading Software
Model 5660 For remote programming of the SK-5208 using a personal computer.
PLEX-2 Optional door accessory for single button operation. (See Section 4.3 for
programming.)