D100-99-00 1 I56-2170-04R
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
INSTALLATION AND MAINTENANCE INSTRUCTIONS
Photoelectric Smoke Detector
2-Wire: 2WTR-B (Form C Relay), 2WTA-B (Sounder)
4-Wire: 4WTR-B (Form C Relay), 4WTA-B (Sounder)
4WTAR-B (Form C Relay, Sounder), 4WITAR-B (Isolated Thermal, Form C Relay, Sounder)
Series
Before Installing
Please read thoroughly System Sensor Application Guide:
System Smoke Detectors, which provides detailed information
on detector spacing, placement, zoning, wiring, and special
applications. Copies are available on System Sensor’s web site:
www.systemsensor.com.
NOTICE: This manual shall be left with the owner/user of this
equipment.
IMPORTANT: This detector must be tested and maintained regu-
larly following National Fire Protection Association (NFPA) 72
National Fire Alarm Code requirements. At a minimum, cleaning
should be performed annually.
General Description
Models 2WTR-B and 2WTA-B are 2-wire photoelectric smoke
detectors; models 4WTR-B, 4WTA-B, 4WTAR-B, and 4WITAR-B
are 4-wire photoelectric smoke detectors. All models incorpo-
rate a state-of-the-art optical sensing chamber and an advanced
microprocessor. The microprocessor allows the detector to auto-
matically 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 detec-
tor. This includes cleaning, maintenance or screen replacement.
All models 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.
Models 2WTA-B, 4WTA-B, 4WTAR-B, and 4WITAR-B contain a
piezoelectric horn which generates the ANSI S3.41 temporal pat-
tern in an alarm condition. All detectors on a zone will sound
when the power supply to them is reversed. The RRS-MOD can be
used for the power supply reversal function. The RRS-MOD also
enables all the detectors’ sounders on a zone to be synchronized
and allows the zone to be silenced from the panel by entering the
alarm silence key at the keypad.
The detector that initiated the alarm condition will have its red
LED and Form C relays (if applicable) latched until reset by
panel.
The model 4WITAR-B photoelectronic smoke sensor is isolated
from the fixed-temperature heat sensor, providing a self-resetting,
local audible smoke alarm that does not alarm at the panel. Only
the fixed-temperature heat sensor will cause the 4WITAR-B to ini-
tiate an alarm at the panel and the relay to change its state.
NOTE: In order for all i
3
sounder detectors on a loop to sound
when the panel alarms, the supply voltage polarity must be
reversed. A reversing relay, System Sensor model number
RRS-MOD, must be used. The RRS-MOD is designed to allow
all i
3
Series detectors in the same loop to sound when one of
the detectors goes into alarm. In addition, the RRS-MOD will
synchronize all of the i
3
Series sounder smoke detectors on
the loop. Some panels may require the use of programmable
outputs. Refer to System Sensor literature for further informa-
tion on the RRS-MOD.
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
Ready” control panel or the i
3
Series 2W-
MOD2 module (refer to installation manual), the 2WTR-B and
2WTA-B are capable of generating a “maintenance needed” sig-
nal. The 2W-MOD2 can indicate a need for cleaning, replacement,
or a freeze trouble at the control panel or module.
The 2W-MOD2 has replaced the previous model number 2W-
MOD. To ensure proper remote maintenance signaling capabili-
ties, do not use the 2W-MOD with i
3
model numbers 2WTR-B and
2WTA-B.
Installation of the 2WTR-B, 2WTA-B, 4WTR-B, 4WTA-B, 4WTAR-
B, and 4WITAR-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
During 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 conjuction with panel alarm
verification.
NOTE: If, during power-up, the detector determines there is exces-
sive electrical noise in the system such as those caused by improp-
er grounding of the system or the conduit, both LEDs will blink for
up to 4 minutes before displaying detector status (see Table 2).
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