[For local application systems, discharge time shall be [30 seconds]
[[_____] minute(s)].] At the completion of the timed discharge, the system
shall automatically recycle and again be ready for actuation.
2.7.3
Sequence of Operation
Smoke detection system shall be [cross-zoned] [or priority matrix]. If a
cross-zoned system is used, each protected area shall contain two smoke
detection circuits (zones), with each circuit having an equal number of
detectors connected thereto and no two adjacent detectors connected to the
same zone. Upon activation of any smoke detector, the system shall
simultaneously activate pre-discharge alarms in the protected areas, signal
the building fire alarm control panels to activate the building fire
evacuation alarms, and send a signal to the base fire department via the
base fire alarm system. Upon activation of a second detector (on the
opposite zone of a cross-zoned system), systems shall immediately shut down
[computer] [_____] equipment and air conditioning power, close fire dampers
[and fire doors] [and windows], activate discharge alarms, and initiate an
adjustable zero to 60 second discharge time delay. At end of time delay,
[computer power shall shut down, and] carbon dioxide shall discharge into
protected area [, and post discharge visual alarms shall activate].
2.7.4
Pressure-Operated Fire Alarm Switch
Provide switch to actuate the building interior fire alarm system upon the
discharge of carbon dioxide.
2.7.5
Pressure-Operated Equipment Switch
**************************************************************************
NOTE: Omit if there is no air handling system
serving the protected areas.
**************************************************************************
For each protected space, provide pressure switches to automatically shut
down the air handling equipment [and close dampers] [and close room doors
[and windows]] upon the discharge of carbon dioxide.
2.7.6
Control Panel
**************************************************************************
NOTE: Use only when electrical actuation is
specified.
**************************************************************************
Provide complete electrical supervision of control circuitry. Provide
modular type panel in a [flush] [surface] mounted steel cabinet with hinged
door and cylinder lock. Ensure control panel is a neat, compact,
factory-wired assembly containing all parts and equipment required to
provide specified operating and supervisory functions of the system. Loss
of ac power or a ground fault condition which prevents the required
operation of the system or a single break in a control circuit shall result
in the activation of a system trouble bell. Trouble bell shall sound
continuously until the system has been restored to normal at the control
panel. Provide a silencing switch, which transfers trouble signals to an
indicating lamp, in accordance with requirements of NFPA 72. In addition
to the normal system trouble bell, provide a remote 100 mm 4 inch system
trouble bell with a rigid plastic or metal identification sign with the
words "CARBON DIOXIDE SYSTEM TROUBLE." Provide lettering on identification
SECTION 13962N
Page 18
Previous Page
