provide 2-wire detectors. For additions to existing
4-wire systems, or when detector auxiliary contacts
are used for critical control functions (such as
elevator recall or air handler shutdown) edit this
specification to require the Contractor to provide
4-wire detectors only.
For further guidance, consult with the EFD/EFA Fire
Protection Engineer.
**************************************************************************
Provide detectors designed for detection of abnormal smoke densities by the
[ionization] [or] [photoelectric] principle. Detectors shall be [4-wire]
[or] [2-wire] type. Provide necessary control and power modules required
for operation integral with the control panel. Detectors and associated
modules shall be compatible with the control panel and shall be suitable
for use in a supervised circuit. Malfunction of the electrical circuits to
the detector or its control or power units shall result in the operation of
the system trouble signals. Each detector shall contain a visible
indicator lamp that shall flash when the detector is in the normal standby
mode and shall glow continuously when the detector is activated. [Remote
indicator lamp shall be provided for each detector that is located above
suspended ceilings, beneath raised floors, or otherwise concealed from
view.] Each detector shall be the plug-in type with tab-lock or
twist-lock, quick disconnect head and separate base in which the detector
base contains screw terminals for making all wiring connections. Detector
head shall be removable from its base without disconnecting any wires.
Removal of detector head from its base shall cause activation of system
trouble signals. Each detector shall be screened to prevent the entrance
of insects into the detection chamber(s).
[2.2.4.1
4-Wire Smoke Detectors
Detector circuits shall be of the 4-wire type whereby the detector
operating power is transmitted over conductors separate from the initiating
circuit. Provide a separate, fused, power circuit for each smoke detection
initiating circuit (zone). Failure of the power circuit shall be indicated
as a trouble condition on the corresponding initiating circuit.
][2.2.4.2
2-Wire Smoke Detectors
Detector circuits of the 2-wire type whereby the detector operating power
is transmitted over the initiating circuit are permitted, provided the
detectors used are approved by the control panel manufacturer for use with
the control panel provided and are UL listed or FM approved as being
compatible with the control panel (copies of the UL or FM listings showing
compatibility shall be submitted as specified in paragraph entitled
"Submittals"). The total number of detectors on any detection circuit
shall not exceed 80 percent of the maximum number of detectors allowed by
the control panel manufacturer for that circuit. Additional zones above
those specified in the paragraph titled "Initiating Zones" shall be
provided if required to meet the above requirements. Calculations showing
compliance with the power consumption limitation requirements shall be
submitted with the calculations required by the paragraph entitled "Design
Data." The manufacturer's data submitted under the paragraph entitled
"Manufacturer's Catalog Data" shall clearly indicate the compatibility of
the detectors with the control panel provided and the maximum number of
detectors permitted per zone.
SECTION 13852N
Page 24
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