D100-96-00 1
I56-1800-08R
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
INSTALLATION AND MAINTENANCE INSTRUCTIONS
Photoelectric Smoke Detector
Models:
2W-B, 2WT-B
4W-B, 4WT-B
Series
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, wir-
ing, 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 regu-
larly 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 detec-
tors; 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 i
3
Series detectors are designed to provide open area protec-
tion. Two-wire models must be used with compatible UL Listed
panels only.
When used with an i
3
Series compatible control panel or the i
3
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.
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)
4 minutes
*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 i
3
Series Model SENS-
RDR 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.
Mounting
Each i
3
Series detector is supplied with a mounting base that can
be mounted:
1. To a single gang box, or
2. To a 3
1
⁄
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).
