System Sensor 2WTR-B, 2WTA-B, 4WTR-B, 4WTAR-B Installation And Maintenance Instructions Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

WARNING

Series

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)

Before Installing

Please read thoroughly System Sensor Applications Guide for System
Smoke Detectors, which provides detailed information on detector spac-

ing, 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 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 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 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 RRS­MOD 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 the i3 Series sounder smoke detectors on the loop. Some
panels may require 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.

The 2W-MOD2 has replaced the previous model number 2W-MOD. To en­sure proper remote maintenance signaling capabilities, do not use the 2W­MOD with i3 model numbers 2WTR-B and 2WTA-B.

D100-99-00 1 I56-2170-007R

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 detec
tor’s status:

Table 1: Detector LED Modes

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 syn
chronously 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

Initial LED Status Indication
(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 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.

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.

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: [phone]

www.systemsensor.com

Green LED Red LED

80 seconds

4 minutes

-

-

Figure 1: Mounting of Detector

SNAP OFF TAB FOR
TAMPER LOCK

TAMPER RELEASE TAB

DIRECT MOUNT HOLES

2-WIRE
ZONE

2-WIRE
CONTROL
PANEL

+

–

(5)

RA –

(4)

RA +

(3)

– IN/OUT

(2)

+ OUT

(1)

+ IN

RA400Z

EOL
RESISTOR

OPTIONAL
RELEASING
DEVICE

(6) NC

(7) C

(8) NO

NOT INCLUDED ON
2WTA-B MODEL

CAUTION

AUX OR
SMOKE
POWER

IDC

4-WIRE
CONTROL
PANEL

+

+

–

–

(
5
)
A

(
4
)
A

(

3

)

– IN/OUT

(
2
)
+ OUT

(
1
)
+ IN

EOL
RELAY
(

A77-716B

)

EOL
RESISTOR

(
5
)
A

(
4
)
A

(
3
)
– IN/OUT

(
2
)
+ OUT

(
1
)
+ IN

NOT INCLUDED ON
4WTA-B MODEL

NOT INCLUDED ON
4WTA-B MODEL

OPTIONAL
RELEASING
DEVICE

(6) NC

(7) C

(8) NO

OPTIONAL
RELEASING
DEVICE

(6) NC

(7) C

(8) NO

WARNING

S0121-00

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 4WTR­B, 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 4­wire. 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

NOTE: Style D initiating circuits require the use of a 2W-MOD2 for models
2WTR-B and 2WTA-B.

Wiring Diagrams

Figure 3a: Wiring Diagram, 2WTR-B and 2WTA-B

S0122-00

NOTE: FOR ALL COMPATIBLE ADEMCO PANELS,

DO NOT EXCEED 30 OHMS LINE IMPEDANCE.

NOTE: ONLY ONE 2WTR-B DETECTOR PER ZONE CAN BE USED.

NOTE: Only one 2WTA-B detector shall be installed on a zone, unless the
panel switches the zone to a reverse polarity, non-current limited power
supply. For panels that do not provide this feature, a reversing relay, Sys­tem Sensor model RRS-MOD, may be used. When utilized with the 2WTA­B, it allows for more than one detector to be utilized on a loop. Some
panels may require the use of programmable outputs. Refer to System Sen­sor literature for further information on the RRS-MOD. The 2WTA-B detec­tor shall not be mixed with other 2-wire detectors on the same zone.

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 insula-

tion 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.

NOTE: Models 2WTR-B and 2WTA-B are not to be installed on initiating
circuits containing other makes/models of smoke detectors.

D100-99-00 2 I56-2170-007R

S0109-00

Any 2-wire i3 smoke detector (2W-B, 2WT-B, 2WTA-B, or 2WTR-B) wired
in the Style D initiating device circuit (IDC) configuration requires the use
of a 2W-MOD2 module. This is because fire alarm control panels vary by
manufacturer on the implementation of Style D circuits. Therefore, the
only way to insure proper operation of 2-wire i3 smoke detectors (2W-B,
2WT-B, 2WTA-B, or 2WTR-B) on Style D IDC’s is to use a 2W-MOD2 mod­ule. Refer to the 2W-MOD2 installation manual, document D500-46-00,
for Style D wiring diagrams. The 2W-MOD2 installation manual may be
downloaded from the System Sensor web site at www.systemsensor.com.

Figure 3b: Wiring Diagram, 4WTR-B, 4WTA-B, 4WTAR-B, and
4WITAR-B

S0123-00

Installation

Remove power from alarm control unit or initiating device circuits before
installing detectors.

NOTE: To install units so that corresponding LEDs are lined up, refer to
the “Green LED” indicator on the base.

1. Wire the mounting base screw terminals per Figure 3a or Figure 3b,

CAUTION

CAUTION

CAUTION

LED

RECESSED TEST SWITCH

POSITION SENS-RDR
AT AN ANGLE ON THE
OVAL AREA OR AT THE
CHAMBER OPENING
BY THE WORD “PAINT”

PUSH RECESSED
SWITCH WITH
A 0.18 MAX.
DIAMETER TOOL

WARNING

REMOVABLE
DETECTOR
COVER

SCREEN/SENSING
CHAMBER
(TOP HALF)

DETECTOR
HOUSING

as applicable.

2. Place detector on the base and rotate clockwise. The detector will
drop into the base and lock into place with a “click”.

3. After all detectors have been installed, apply power to the alarm
control unit.

4. Test each detector as described in Testing.

5. Reset all the detectors at the alarm control unit.

6. Notify the proper authorities that the system is in operation.

Dust covers are an effective way to limit the entry of dust into
the smoke detector sensing chamber during construction. However, they
may not completely prevent airborne dust particles from entering the de­tector. Therefore, System Sensor recommends the removal of detectors
before beginning construction or other dust producing activity. When re­turning the system to service, be sure to remove the dust covers from any
detectors that were left in place during construction.

Smoke detectors are not to be used with detector guards unless the combi­nation has been evaluated and found suitable for that purpose.

When using the RRS-MOD with model 2WTA-B, do not mix the 2WTA-B
with other model smoke detectors and dry contact closure devices, in­cluding mechanical heat detectors, manual pull stations and waterflow
switches. Such mixing can cause a direct short on the auxiliary power
terminals, damaging the control panel’s internal circuitry and/or damage
devices connected to the initiating device circuit.

C. Direct Heat Method

Using a 1000-1500 watt hair dryer, direct the heat toward either of the
thermistors. Hold the heat source about 12 inches from the detector to
avoid damage to the plastic.

NOTE: For the above tests, the detector will reset only after the power
source has been momentarily interrupted. It is not necessary to reset the
model 4WITAR-B, when smoke is used to initiate the alarm.

When testing the 4WITAR-B model, pressing the test switch will result in a
non-latching local alarm that does not alarm at the control panel. Once the
test button is released, the unit will return to its standby condition. Only
the fixed-temperature heat sensor will cause the 4WITAR-B to initiate an
alarm at the panel.

If a detector fails any of the above test methods, its wiring should be
checked and it should be cleaned as outlined in the Maintenance section.
If the detector still fails, it should be replaced.

Notify the proper authorities when the system is back in service.

Loop Verification (models 2WTR-B and 2WTA-B only)

Loop verification is provided by the EZ Walk loop test feature. This feature
is for use with i3 Series compatible control panels or the i3 Series 2W­MOD2 module only. The EZ Walk loop test verifies the initiating loop wir­ing and provides visual status indication at each detector. Refer to System
Sensor literature for further information on the 2W-MOD2.

The 2W-MOD2 has replaced the previous model number 2W-MOD. To
ensure proper EZ Walk Test capabilities, do not use the 2W-MOD with i
model numbers 2WTR-B and 2WTA-B.

Table 3: EZ Walk Test Detector Modes

3

Testing

Detectors must be tested after installation and following maintenance.

NOTE: Before testing, notify the proper authorities that maintenance is be­ing performed and the system will be temporarily out of service. Disable the
zone or system undergoing maintenance to prevent any unwanted alarms.

Ensure proper wiring and power is applied. After power up, allow 80 sec-

onds for the detector to stabilize before testing.

Test i3 Series detectors as follows:

A. Test Switch

1. An opening for the recessed test switch is located on the detector
housing (See Figure 4).

2. Insert a small screwdriver or allen wrench (0.18˝ max.) into the test
switch opening; push and hold.

3. If the detector is within the listed sensitivity limits, the detector’s red
LED should light within one second.

Figure 4: Recessed Test Switch Opening and
SENS-RDR Position

Green LED Red LED

Proper Operation Double blink 5 sec —

Out of Sensitivity — Double Blink 5 sec

Freeze Condition — Double Blink 10 sec

NOTE: The EZ Walk loop test must not be used instead of alarm testing.

Maintenance

NOTE: Before performing maintenance on the detector, notify the proper
authorities that maintenance is being performed and the system will be
temporarily out of service. Disable the zone or system undergoing mainte­nance to prevent any unwanted alarms. Power must be removed from the
detector before performing maintenance of any kind.

1. Remove the detector cover by turning counterclockwise. (See Figure 5.)

2. Vacuum the cover or use canned air to remove any dust or debris.

3. Remove the top half of the screen/sensing chamber by lifting straight
up (Figure 5).

4. Vacuum or use canned air to remove any dust or particles that are
present on both chamber halves.

5. Replace the top half of the screen/sensing chamber by aligning the
arrow on the screen/sensing chamber with the arrow on the housing.
Press down firmly until the screen/sensing chamber is fully seated.

6. Replace the detector cover by placing it over the screen/sensing cham­ber and turning it clockwise until it snaps into place.

7. Reinstall the detector and test. (See the Testing section.)

8. Notify the proper authorities when the system is back in service.

Figure 5: Removing Screen/Sensing Chamber

B. Smoke Entry Test

Hold a smoldering punk stick or cotton wick at the side of the detector and
gently blow the smoke through the detector until it alarms.

D100-99-00 3 I56-2170-007R

S0110-00

S0111-00

E

lectrical 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
Alarm Verification**
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.

Please refer to insert for the Limitations of Fire Alarm Systems

System Sensor warrants its enclosed product to be free from defects in
materials and workmanship under normal use and service for a period
of three years from date of manufacture. System Sensor makes no other
express warranty for the enclosed product. No agent, representative,
dealer, or employee of the Company has the authority to increase or alter
the obligations or limitations of this Warranty. The Company’s obliga­tion of this Warranty shall be limited to the replacement of any part of
the product which is found to be defective in materials or workman­ship under normal use and service during the three year period com­mencing with the date of manufacture. After phoning System Sensor’s
toll free number 800-SENSOR2 (736-7672) for a Return Authorization
number, send defective units postage prepaid to: System Sensor, Returns

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired operation.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to pro­vide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the following measures:
– Reorient or relocate the receiving antenna.
– Increase the separation between the equipment and receiver.
– Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
– Consult the dealer or an experienced radio/TV technician for help.

D100-99-00 4 I56-2170-007R
©2006 System Sensor

Three-Year Limited Warranty

Department, RA #__________, 3825 Ohio Avenue, St. Charles, IL 60174.
Please include a note describing the malfunction and suspected cause
of failure. The Company shall not be obligated to replace units which
are found to be defective because of damage, unreasonable use, modi­fications, or alterations occurring after the date of manufacture. In no
case shall the Company be liable for any consequential or incidental
damages for breach of this or any other Warranty, expressed or implied
whatsoever, even if the loss or damage is caused by the Company’s
negligence or fault. Some states do not allow the exclusion or limita­tion of incidental or consequential damages, so the above limitation or
exclusion may not apply to you. This Warranty gives you specific legal
rights, and you may also have other rights which vary from state to state.

FCC Statement