System Sensor i3 User Manual
INSTALLATION AND MAINTENANCE INSTRUCTIONS
Series
I56-2170-008R
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)
ELECTRICAL SPECIFICATIONS
2-wire 4-wire
System Voltage –Nominal: 12/24 12/24 V
(Non-polarized for 2WTR-B and 4WTR-B)
Min.: 8.5 10 V
Max.: 35 35 V
Max. Ripple Voltage: 30 30 % peak to peak of applied voltage
Avg. Standby Current: 50 50 µA average
Peak Standby Current: 100 — µA
Max. Alarm Current
4WTA-B, 4WTR-B: — 35 mA
4WTAR-B, 4WITAR-B: — 50 mA
2WTR-B: 130 — mA panel must limit current
2WTA-B: 130*
Alarm Contact Ratings: — 0.5 A @ 30 V AC/DC
Form C Contact Ratings: 2 2 A @ 30 V AC/DC
Audible Signal
(temp-3 tone): 85 85 dBA min. in alarm or supply polarity reversed (Sounder units only)
Remote Annunciator Output: 7 — mA maximum
EOL Relay: — 12/24 A77-716B
2-wire 4-wire
Reset Time (min): 0.3 0.3 seconds
Max. Start-up Capacitance: 0.1 — µF
Max. Initial Start-up Time: 45 15 seconds
AlarmVerification**
Start-up Time: 15 15 seconds
* Direct Power (Non-reverse Polarity): 130 mA limited by panel.
Reverse Polarity Power: 30 mA for the 2WTA-B in alarm; 12 mA for all other 2WTA-B units on the loop. Add 25 mA for the RRS-MOD reversing relay alarm current.
** 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: 135°F (57.2°C)
Freeze Trouble: 41°F (5°C)
Operating Temperature Range: 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: 7.1 oz.
BEFORE INSTALLING
Please read thoroughly System Sensor Applications Guide for System Smoke
Detectors, which provides detailed information on detector spacing, place-
ment, 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 regularly 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 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. 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 pattern 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 RRSMOD 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 fixedtemperature 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 initiate an alarm at the panel and the relay to change
its state.
NOTE: In order for all i3 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 i3 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
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
D100-99-00 1 I56-2170-008R
the i3 Series sounder smoke detectors on the loop. Some panels may require
SNAP OFF TAB FOR
the use of programmable outputs. Refer to System Sensor literature for further
information on the RRS-MOD.
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 Ready” control panel or the i3 Series 2W-MOD2 module (refer to installation manual), the 2WTR-B and 2WTA-B are capable of
generating a “maintenance needed” signal. The 2W-MOD2 can indicate a need
for cleaning, replacement, or a freeze trouble at the control panel or module.
WARNING
The 2W-MOD2 has replaced the previous model number 2W-MOD. To ensure
proper remote maintenance signaling capabilities, do not use the 2W-MOD
with i3 model numbers 2WTR-B and 2WTA-B.
Each i3 Series detector is supplied with a mounting base that can be ceiling- or
wall-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 1: MOUNTING OF DETECTOR
S0121-00
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
4 minutes
(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 SENS-RDR Infrared
Sensitivity Reader tool (see Figure 4) should be used. Refer to instructions
manual D100-98-00 for the proper use of the SENS-RDR.
Models 2WTR-B and 2WTA-B also include an output that allows an optional
Model RA400Z/RA100Z Remote Annunciator to be connected.
MOUNTING
General spacing guidelines are 30˝×30˝, with each detector covering 900 ft2
under maximum conditions.
Consult NFPA 72, the local Authority Having Jurisdiction (AHJ), and/or applicable codes for specific information regarding the spacing and placement
of smoke detectors.
The i3 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 i3 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 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.
INSTALLATION GUIDELINES
The i3 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
TAMPER LOCK
TAMPER RELEASE TAB
DIRECT MOUNT HOLES
S0109-00
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 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 colorcoded 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. 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.
D100-99-00 2 I56-2170-008R
Loading...