D100-99-00
2
I56-2170-007R
Figure 1: Mounting of Detector
S0121-00
The i
3
Series heads and bases are keyed so that all heads will only fit into
their respective bases. One model 4-wire relay base will accept the 4WTR-
B, 4WTAR-B and 4WITAR-B detector heads and no others. The 2WTR-B,
2WTA-B and 4WTA-B will only fit into their respective mounting bases and
no others. 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, and the test switch is aligned with the tamper release tab.
Tamper-Resistant Feature
The i
3
Series detectors include a tamper-resistant feature that prevents re-
moval from the mounting base without the use of a tool. To engage the
tamper-resistant feature, cut the small plastic tab located on the mount-
ing 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 screw-
driver to depress the square tamper release tab, located on the skirt of the
mounting base, and turn the detector counterclockwise.
Installation Guidelines
The i
3
Series detectors represent an advancement over the previous
sounder and Form C relay models and are designed to be used with the
2W-MOD2 and RRS-MOD only. Do not mix detector models on a zone.
Figure 2: Tamper-Resistant Feature
SNAP OFF TAB FOR
TAMPER LOCK
TAMPER RELEASE TAB
DIRECT MOUNT HOLES
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Wiring Installation Guidelines
All wiring must be installed in compliance with the NFPA 70, National
Electrical Code, applicable state and local codes, and any special require-
ments of the local Authority Having Jurisdiction.
Proper wire gauges should be used. The conductors used to connect 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 responding 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 con-
duit 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 insula-
tion from the end of the feed wire, inserting it into the proper base termi-
nal, and tightening the screw to secure the wire in place. Do not put wires
more than 2 gauge apart under the same clamping plate.
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 2WTR-B and 2WTA-B, connect detectors only to compatible alarm
control panels as identified by System Sensor’s two-wire compatibility
chart, available at www.systemsensor.com.
NOTE:
Models 2WTR-B and 2WTA-B are not to be installed on initiating
circuits containing other makes/models of smoke detectors.
NOTE:
Style D initiating circuits require the use of a 2W-MOD2 for models
2WTR-B and 2WTA-B.
Wiring Diagrams
Figure 3a: Wiring Diagram, 2WTR-B and 2WTA-B
2-WIRE
ZONE
2-WIRE
CONTROL
PANEL
+
–
(5) RA –
(4) RA +
(3) – IN/OUT
(2) + OUT
(1) + IN
RA400Z
EOL
RESISTOR
OPTIONAL
RELEASING
DEVICE
(6) NC
(7) C
(8) NO
NOT INCLUDED ON
2WTA-B MODEL
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NOTE:
FOR ALL COMPATIBLE ADEMCO PANELS,
DO NOT EXCEED 30 OHMS LINE IMPEDANCE.
NOTE:
ONLY ONE 2WTR-B DETECTOR PER ZONE CAN BE USED.
NOTE:
Only one 2WTA-B detector shall be installed on a zone, unless the
panel switches the zone to a reverse polarity, non-current limited power
supply. For panels that do not provide this feature, a reversing relay, Sys-
tem Sensor model RRS-MOD, may be used. When utilized with the 2WTA-
B, it allows for more than one detector to be utilized on a loop. Some
panels may require the use of programmable outputs. Refer to System Sen-
sor literature for further information on the RRS-MOD. The 2WTA-B detec-
tor shall not be mixed with other 2-wire detectors on the same zone.
CAUTION
Any 2-wire i
3
smoke detector (2W-B, 2WT-B, 2WTA-B, or 2WTR-B) wired
in the Style D initiating device circuit (IDC) configuration requires the use
of a 2W-MOD2 module. This is because fire alarm control panels vary by
manufacturer on the implementation of Style D circuits. Therefore, the
only way to insure proper operation of 2-wire i
3
smoke detectors (2W-B,
2WT-B, 2WTA-B, or 2WTR-B) on Style D IDC’s is to use a 2W-MOD2 mod-
ule. Refer to the 2W-MOD2 installation manual, document D500-46-00,
for Style D wiring diagrams. The 2W-MOD2 installation manual may be
downloaded from the System Sensor web site at www.systemsensor.com.
Figure 3b: Wiring Diagram, 4WTR-B, 4WTA-B, 4WTAR-B, and
4WITAR-B
AUX OR
SMOKE
POWER
IDC
4-WIRE
CONTROL
PANEL
+
+
–
–
(5
) A
(4
) A
(3
) – IN/OUT
(2
) + OUT
(1
) + IN
EOL
RELAY
(A77-716B)
EOL
RESISTOR
(5
) A
(4
) A
(3
) – IN/OUT
(2
) + OUT
(1
) + IN
NOT INCLUDED ON
4WTA-B MODEL
NOT INCLUDED ON
4WTA-B MODEL
OPTIONAL
RELEASING
DEVICE
(6) NC
(7)
C
(8) NO
OPTIONAL
RELEASING
DEVICE
(6) NC
(7)
C
(8) NO
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Installation
WARNING
Remove power from alarm control unit or initiating device circuits before
installing detectors.
NOTE:
To install units so that corresponding LEDs are lined up, refer to
the “Green LED” indicator on the base.
