System Sensor i3 User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

Series

Photoelectric Smoke Detector

Models: 2W-B, 2WT-B, 4W-B, 4WT-B

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.

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: [phone]

www.systemsensor.com

I56-1800-011R

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 2W­MOD 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)

*Refer to Electrical Specifications for start-up time in conjunction with panel
alarm verification.

4 minutes

D100-96-00 1 I56-1800-011R

NOTE: If, during power-up, the detector determines there is excessive electri-

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

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 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 should be used. (See Figure 4.)

Models 2W-B and 2WT-B also include an output that allows an optional Model
RA400Z Remote Annunciator to be connected.

MOUNTING

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

• 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 condition-

ers, heaters, fans, and fresh air intakes and returns can drive smoke
away from the detector.

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 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.

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.

WIRING DIAGRAMS
FIGURE 3A: WIRING DIAGRAM, 2W-B AND 2WT-B

S0133-00

FIGURE 3B: WIRING DIAGRAM, 4W-B AND 4WT-B

DO NOT INSTALL DETECTORS IN THE FOLLOWING AREAS:

• In or near areas where particles of combustion are normally present

S0226-00

AUX OR
SMOKE
POWER

IDC

4-WIRE
CONTROL
PANEL

+

–

–
+

(

(

(

(

(
1
)
+ IN

3

2

)

)

– IN/OUT

+ OUT

4W-B or
4WT-B

5

4

)

)

COM

NO

(
1
)
+ IN

(

(

3

2

)

)

– IN/OUT

+ OUT

4W-B or
4WT-B

(
4
)
NO

(
5
)
COM

EOL

RELAY

(

EOLR-1

EOL
RESISTOR

S0134-01

such as kitchens; in garages (vehicle exhaust); near furnaces, hot water
heaters, or gas space heaters.

• In very cold or very hot areas.

D100-96-00 2 I56-1800-011R

)