System Sensor 2W-B User Manual
INSTALLATION AND MAINTENANCE INSTRUCTIONS
Series
Photoelectric Smoke Detector
Models: 2W-B, 2WT-B
4W-B, 4WT-B
Before Installing
Please read thoroughly System Sensor manual A05-1003,
Applications Guide for System Smoke Detectors, which provides
detailed information on detector spacing, placement, zoning, wiring, and special applications. Copies of this manual are available
from System Sensor at no charge.
NOTICE: This manual shall be left with the owner/user of this
equipment.
IMPORTANT: This detector must be tested and maintained regularly following NFPA 72 requirements. At a minimum, cleaning
should be performed annually.
General Description
Models 2W-B and 2WT-B are 2-wire photoelectric smoke detectors; models 4W-B and 4WT-B are 4-wire photoelectric smoke
detectors. All models incorporate a state-of-the-art optical sensing
chamber and an advanced microprocessor. The microprocessor
allows the detector to automatically adjust its sensitivity back
to the factory setting when it becomes more sensitive due to
contaminants settling in its chamber. In order for this feature
to work properly, the chamber must never be opened while
power is applied to the smoke detector. This includes cleaning,
maintenance or screen replacement. Should it become necessary,
the screen/sensing chamber is field replaceable. Models 2WT-B
and 4WT-B also feature a restorable, built-in, fixed temperature
(135°F) thermal detector and are also capable of sensing a freeze
condition if the temperature is below 41°F.
All i3 Series detectors are designed to provide open area protection. Two-wire models must be used with compatible UL Listed
panels only.
When used with an i3 Series compatible control panel or the i3
Series 2W-MOD module (refer to installation manual D500-46-00),
the 2W-B and 2WT-B are capable of generating a “maintenance
needed” signal. The 2W-MOD can indicate a need for cleaning,
replacement, or a freeze condition (2WT-B only) at the control
panel or module.
Installation of the 2W-B, 2WT-B, 4W-B, and 4WT-B detectors is
simplified by the use of a mounting base that may be pre-wired
to the system, allowing the detector to be easily installed or
removed. The mounting base installation is further simplified by
the incorporation of features compatible with drywall fasteners.
3825 Ohio Avenue, St. Charles, Illinois 60174
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Two LEDs on the detector provide a local visual indication of the
detector’s status:
Table 1: Detector LED Modes
Green LED Red LED
Power-up Blink 10 sec Blink 10 sec
Normal (standby) Blink 5 sec —
Out of sensitivity — Blink 5 sec
Freeze Trouble — Blink 10 sec
Alarm — Solid
After an initial power-up delay, the red and green LEDs will blink
synchronously once every ten seconds. It will take approximately 80
seconds for the detector to finish the power-up cycle (see Table 2).
Table 2: Power-up Sequence for LED Status Indication*
Condition Duration
Initial LED Status Indication 80 seconds
Initial LED Status Indication
(if excessive electrical noise is present)
*Refer to Electrical Specifications for start-up time in conjunction with panel alarm
verification.
NOTE: If, during power-up, the detector determines there is
excessive electrical noise in the system such as those caused by
improper grounding of the system or the conduit, both LEDs will
blink for up to 4 minutes before displaying detector status (see
Table 2).
After power-up has completed and the detector is functioning
normally within its listed sensitivity range, the green LED blinks
once every five seconds. If the detector is in need of maintenance
because its sensitivity has shifted outside the listed limits, the red
LED blinks once every five seconds. When the detector is in the
alarm mode, the red LED latches on. The LED indication must not
be used in lieu of the tests specified under Testing. In a freeze
trouble condition, the red LED will blink once every 10 seconds
(refer to Table 1).
To measure the detector’s sensitivity, the i3 Series Model SENSRDR Infrared Sensitivity Reader tool (see Figure 4) should be
used.
Models 2W-B and 2WT-B also include an output that allows an
optional Model RA400Z Remote Annunciator to be connected.
4 minutes
D100-96-00 1 I56-1800-07R
Mounting
SNAP OFF TAB
FOR TAMPER LOCK
TAMPER
RELEASE TAB
DIRECT MOUNT
HOLES
CAUTION
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
Each i3 Series detector is supplied with a mounting base that can
be mounted:
1. To a single gang box, or
2. To a 31⁄2-inch or 4-inch octagonal box, or
3. To a 4-inch square box with a plaster ring, or
4. Direct mount or to ceiling using drywall fasteners (Figure 2).
Figure 1: Mounting of Detector
S0121-00
The i3 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 i3 Series, ensure that
the head is mounted to the correct base.
Tamper-Resistant Feature
The i3 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
Consult NFPA 72, the local Authority Having Jurisdiction (AHJ),
and/or applicable codes for specific information regarding the
spacing and placement of smoke detectors.
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 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 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. NOTE: Style
D initiating circuits require the use of a 2W-MOD for models
2W-B and 2WT-B.
Wiring Diagrams
Figure 3a: Wiring Diagram, 2W-B and 2WT-B
S0226-00
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
S0133-00
conditioners, heaters, fans, and fresh air intakes and returns
can drive smoke away from the detector.
D100-96-00 2 I56-1800-07R
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