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

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