in the upper half of the underfloor space.
Do not mount detectors facing
upward.
a.
Ionization Detectors: Provide multiple chamber type which are
responsive to both invisible and visible particles of combustion.
Detector operation shall not be affected by changes in relative
humidity.
b.
Photoelectric Detectors: Provide detectors which operate on a
multiple cell concept using a light-emitting diode (LED) light
source. Failure of the LED shall not cause an alarm condition but
shall operate the detector indicating lamp.
2.6.3
Control Panel
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NOTE: Use for electrically operated systems.
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Provide a [modular type] control panel for electrically operated detection
and extinguishing systems for each [deluge] [preaction] valve; install in a
surface-mounted steel cabinet with hinged doors [and cylinder lock].
Control panels shall be a neat, compact, factory-wired assembly containing
components and equipment necessary to perform specified operating and
supervisory functions of the system. Provide a control panel with an
isolation switch that shall, when activated, allow testing of the system
without activating the [preaction] [deluge] valve. House batteries in a
lockable steel cabinet. Finish interior and exterior of cabinet with
enamel paint; attach prominent rigid plastic or metal identification
plates. Provide trouble lights on cabinet door, and provide trouble alarm
above cabinet top.
Provide 120 volts ac service, transformed through a
two-winding isolation type transformer and rectified to low-voltage dc for
operation of all system actuating, signal sounding, trouble signal, and
fire alarm tripping circuits. [Control panel shall be UL Fire Prot Dir
listed or FM P7825 approved as an extinguishing system releasing panel and
shall be separate from the building's fire alarm control panel.]
2.6.4
Secondary Power Supply
Provide nickel cadmium, lead calcium, or sealed lead acid rechargeable
storage batteries and battery charger. Dry cell batteries will not be
permitted.
a.
Storage Batteries: Provide rechargeable lead calcium or sealed
lead acid type with sufficient ampere-hour rating to operate the
system under supervisory [and trouble] conditions [, including
audible trouble signal devices] for [60] [_____] hours and audible
[and visual] signal devices under alarm conditions for an
additional [10] [_____] minutes and as required per the equipment
listing. Separate cells to prevent contact between terminals of
adjacent cells and between battery terminals and other metal parts.
b.
Battery
Charger: Provide solid state automatic two rate type,
capable
of recharging completely discharged batteries to fully
charged
condition in 24 hours or less. Locate charger within the
control
panel or within the battery cabinet.
SECTION 13945N
Page 18
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