System Sensor 4WT-B - Manual (Page 2)

D100-96-00 2 I56-1800-08R
Figure 1: Mounting of Detector
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The i 3 Series heads and bases are keyed so that a 2-wire head will
only mount to a 2-wire base, and a 4-wire head will only mount
to a 4-wire base. The heads and bases are clearly identified as
either 2-wire or 4-wire. When mounting the i
3 Series, ensure that
the head is mounted to the correct base.
Tamper-Resistant Feature
The i 3 Series detectors include a tamper-resistant feature that
prevents removal from the mounting base without the use of a
tool. To engage the tamper-resistant feature, cut the small plastic
tab located on the mounting base (Figure 2), and then install the
detector. To remove the detector from the base once it has been
made tamper resistant, use a small screwdriver to depress the
square tamper release tab, located on the skirt of the mounting
base, and turn the detector counterclockwise.
Figure 2: Tamper-Resistant Feature
SNAP OFF TAB
FOR TAMPER LOCK
TAMPER
RELEASE TAB
DIRECT MOUNT
HOLES
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Do NOT Install Detectors in the Following Areas:
• In or near areas where particles of combustion are normally
present such as kitchens; in garages (vehicle exhaust); near
furnaces, hot water heaters, or gas space heaters.
• In very cold or very hot areas.
• In wet or excessively humid areas, or next to bathrooms with
showers.
• In dusty, dirty, or insect-infested areas.
• Near fresh air inlets or returns or excessively drafty areas. Air
conditioners, heaters, fans, and fresh air intakes and returns
can drive smoke away from the detector.
Consult NFPA 72, the local Authority Having Jurisdiction (AHJ),
and/or applicable codes for specific information regarding the
spacing and placement of smoke detectors.
CAUTION
Smoke detectors are not to be used with detector guards unless
the combination has been evaluated and found suitable for that
purpose.
Wiring Installation Guidelines
All wiring must be installed in compliance with the National
Electrical Code, applicable state and local codes, and any special
requirements of the local Authority Having Jurisdiction.
Proper wire gauges should be used. The conductors used to con-
nect smoke detectors to the alarm control panel and accessory
devices should be color-coded to reduce the likelihood of wiring
errors. Improper connections can prevent a system from respond-
ing properly in the event of a fire.
The screw terminals in the mounting base will accept 14–22
gauge wire. For best system performance, all wiring should be
installed in separate grounded conduit; do not mix fire alarm
system wiring in the same conduit as any other electrical wiring.
Twisted pair may be used to provide additional protection against
extraneous electrical interference.
Wire connections are made by stripping approximately 1 ⁄
4
-inch
of insulation from the end of the feed wire, inserting it into the
proper base terminal, and tightening the screw to secure the wire
in place.
Two-Wire Compatibility
System Sensor two-wire smoke detectors are marked with a
compatibility identifier located on the label on the back of the
product. For two-wire models 2W-B and 2WT-B, connect detectors
only to compatible alarm control panels as identified by System
Sensor’s compatibility chart. This chart contains the current list of
detectors and UL Listed compatible control units. A copy of this
list is available from System Sensor upon request.
Wiring Diagrams
Figure 3a: Wiring Diagram, 2W-B and 2WT-B
2-WIRE
ZONE
2-WIRE
CONTROL
PANEL
+
–
2W-B or
2WT-B
(5
) RA
–
(4
) RA
+
(3
) – IN/OUT
(2
) + OUT
(1
) + IN
(5
) RA
–
(4
) RA
+
(3
) – IN/OUT
(2
) + OUT
(1
) + IN
RA400Z
2W-B or
2WT-B
RA400Z
EOL
RESISTOR
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Figure 3b: Wiring Diagram, 4W-B and 4WT-B
AUX OR
SMOKE
POWER
IDC
4-WIRE
CONTROL
PANEL
+
+
–
–
4W-B or
4WT-B
(5
) COM
(4
) NO
(3
) – IN/OUT
(2
) + OUT
(1
) + IN
EOL
RELAY
(A77-716B)
EOL
RESISTOR
4W-B or
4WT-B
(5
) COM
(4
) NO
(3
) – IN/OUT
(2
) + OUT
(1
) + IN
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