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’s
Applications Guide for System Smoke
Detectors
(SPAG91), which provides detailed information on detector spacing,
placement, zoning, wiring, and special applications. This manual is available
online at www.systemsensor.com. s
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 in-
corporate a state-of-the-art optical sensing chamber and an advanced micro-
processor. 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 prop-
erly, 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. Mod-
els 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 protection. 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-
MOD2 module (refer to installation manual D500-46-00), the 2W-B and 2WT-B
are capable of generating a “maintenance needed” signal. The 2W-MOD2 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 synchro-
nously 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 electri-
cal 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 display-
ing detector status (see Table 2).
I56-1800-0
14
ELECTRICAL
SPECIFICATIONS 2-WIRE
4-WIRE
System Voltage –Nominal:
12/24
12/24 Volts Non-polarized
Min.:
8.5
8.5
Volts
Max.:
35
35
Volts
Max. Ripple Voltage:
30
30 % peak to peak of applied voltage
Max. Standby Current:
50
50 µA average
Peak Standby Current:
100
— µA
Max. Alarm Current:
130
20 mA 12 Volt Systems
(For 2W-B and 2WT-B, panel must limit current)
130
23 mA 24 Volt Systems
Alarm Contact Ratings:
—
0.5 Amp @ 30 V AC/DC
Alarm Reset Time:
0.3
0.3 sec
Max. Start-up Capacitance:
0.1
— µF
Latching Alarm: Reset by momentary power interruption
Maximum Initial
Start-up Time:
45
15 sec
Alarm Verification*
Start-up Time:
15
15 sec
*Assumes the panel’s alarm verification reset time is 10 seconds or less. Should the alarm verification reset exceed 10 seconds, use the maximum initial start-up time.
PHYSICAL SPECIFICATIONS
Heat Sensor (Model 2WT-B and 4WT-B):
135°F (57.2°C)
Freeze Trouble (Model 2WT-B and 4WT-B):
41°F (5°C)
Operating Temperature Range:
2W-B and 4W-B:
32 to 120°F (0 to 49°C)
2WT-B and 4WT-B:
32 to 100°F (0 to 37.8°C)
Operating Humidity Range:
0 to 95% RH non-condensing
Storage Temperature Range:
–4 to 158°F (–20 to 70°C)
Diameter (including base):
5.3 inches
Height (including base):
2.0 inches
Weight:
6.3
oz.
1
I56-1800-014
02-02
