products of combustion. Ensure detectors are not susceptible to operation
by changes in relative humidity.
2.8.1.2
Photoelectric Detectors
Operate on a multiple cell concept using a light-emitting diode (LED) light
source.
2.8.2
Spot Heat Detectors
Provide detectors for [surface] [flush] outlet box mounting. Support
detectors independently of conduit, tubing, or wiring connections. Use
completely metal-enclosed, [combination fixed temperature and rate-of-rise]
[fixed temperature and rate compensated] [______] type detectors. Contacts
shall be self-resetting after [response to rate-of-rise] actuation.
[Operation under fixed temperature actuation shall result in an indication
which may be noted by external visual inspection of the detector, or the
detector shall be the self-resetting type.] Provide fixed temperature type
detectors in areas subject to abnormal temperature changes. [Furnish a
portable electric device suitable for testing detectors.]
2.8.3
Detector Spacing and Location
NFPA 72, manufacturer's recommendations, and requirements stated herein.
Spacing and location of detectors shall take into account airflow into room
and supply diffusers. Do not place detectors within 1.50 meters 5 feet of
discharge grilles. [Spacing of detectors under raised floors shall not
exceed [23.25 square meter] [250 square feet] [_____] per detector.] Mount
detectors installed beneath raised floors with detector base within 50 mm 2
inches of underside of raised floor framing, and with detector facing
downward. Where space under raised floor is less than 305 mm 12 inches in
height, mount detectors with their bases in upper half of underfloor space.
Do not mount detectors facing upward under any circumstances.
2.9
INHIBIT SWITCH
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NOTE: Do not use for Navy projects.
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Provide one switch where indicated. Activation of switch shall delay only
time delay countdown, equipment shutdown, and agent discharge. Switch
shall be guarded, spring-loaded type which operates only when manually
applying pressure to switch. Upon release of manual pressure, switch shall
deactivate allowing delayed functions to resume. After start of agent
discharge, switch shall have no effect. Activation of switch during normal
(non-alarm) conditions shall cause activation of system trouble signals.
2.10
ALARM SIGNALLING DEVICES
Provide each protected area with audible and visual alarms located as
shown. Alarm circuits shall be electrically supervised. Provide separate
and distinct audible and visual pre-discharge and discharge signals. Where
building is equipped with a separate fire evacuation alarm system,
discharge signals shall be distinct from those used by the building fire
evacuation system. Each signal device shall be provided with a rigid
plastic or metal identification sign with lettering a minimum of 40 mm 1.5
inches high. Pre-discharge alarm shall be labelled "FIRE" and discharge
alarm shall be labelled "CARBON DIOXIDE DISCHARGE." [Locate post-discharge
SECTION 13962N
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