power units shall cause activation of building fire alarm control panel
trouble signals.
Electrical supervision of wiring used exclusively for air-handling unit
shutdown is not required provided a break in wiring would cause shutdown of
the associated unit. Equipment and devices shall be compatible and operable
in all respects with, and shall in no way impair reliability or operational
functions of, the existing building fire alarm system. The existing fire
alarm control panel was manufactured by [_____].
Smoke control and exhaust systems shall have provisions for [automatic and]
manual operation by means of a key-operated switch to override any other
shutdown features and shall be located [adjacent to the fire alarm system
control panel] [as indicated].]
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NOTE: Regarding the text below: Use this paragraph
only with specific approval of the Engineering Field
Division Fire Protection Engineer. Approval will
normally be granted only if the building has no fire
alarm system and none is required. When in doubt,
contact the Fire Protection Engineer.
**************************************************************************
[Provide in each air-handling system with supply air capacity greater than
944 L/s 2000 cfm in accordance with NFPA 90A. Locate downstream of the
supply air filters and prior to any branch connection in accordance with
NFPA 72. Provide in each air-handling system, serving more than one story,
and having a return air capacity greater than 7079 L/s 15000 cfm in
accordance with NFPA 90A. Locate at each story prior to connection to
common return and at return connection to air handler prior to any fresh
air inlet connection and prior to any recirculation connection in
accordance with NFPA 72.
Design for detection of abnormal smoke densities by the [ionization] [or]
[photoelectric] principle, responsive to both invisible and visible
particles of combustion, and not susceptible to undesired operation by
changes in relative humidity. Provide UL listed or FM approved detectors
for duct installation. Provide duct detectors with an approved duct
housing, mounted exterior to the duct, and with perforated sampling tubes
extending across the width of the duct.
Provide 115 Vac power supply unit integral with duct housing. Obtain power
from [the source to the air-handling unit or air-handling unit controls]
[the location indicated]. Detectors shall have test port or test switch.
[Provide remote alarm indicator [and keyed test] device at [_____] [the
location indicated].] Provide each detector with a visible indicator lamp
that lights when the detector is activated.
Activation of duct detector shall cause shutdown of the associated
air-handling unit [and closing of dampers] [and shall sound an alarm bell,
with minimum 152 mm6 inch diameter, in a normally occupied area] located
[as directed] [as indicated]. [Provide a separate bell with an engraved
plastic or metal label indicating which unit each bell annunciates for each
air-handling unit.]]
SECTION 15901N
Page 21
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