System Sensor 2WTA-B Manual

System Sensor Røgdetektor 2WTA-B

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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’s Applications Guide for System Smoke

Detectors (SPAG91), which provides detailed information on detector spacing,

placement, zoning, wiring, and special applications. This is available online

from 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 follow-

ing 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 si-

lence 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 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

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.

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 EOLR-1

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.

I56-2170-010

1 I56-2170-010

02-20

When used with an “i3 Ready” control panel or the i

3 Series 2W-MOD2 mod-

ule (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.

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 re-

moved. The mounting base installation is further simplified by the incorpora-

tion 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 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).

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 detec-

tor 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 condi-

tion, 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 ft˝ 2

under maximum conditions.

Consult NFPA 72, the local Authority Having Jurisdiction (AHJ), and/or ap-

plicable 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.

FIGURE 1: MOUNTING OF DETECTOR

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 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 re-

moval from the mounting base without the use of a tool. To engage the tam-

per-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

SNA OFF TAB FORP

TAMPER LOCK

TAMPER RELEASE BTA

DIRECT MOUN HOLEST

S0109-00

WIRING INSTALLATION GUIDELINES

All wiring must be installed in compliance with the NFPA 70, National Electri-

cal 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 color-

coded 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 mod-

els 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 cir-

cuits containing other makes/models of smoke detectors.

NOTE: Style D initiating circuits require the use of a 2W-MOD2 for models

2WTR-B and 2WTA-B.

2 I56-2170-010

02-20

Produkt Specifikationer

Mærke:	System Sensor
Kategori:	Røgdetektor
Model:	2WTA-B

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