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SS-400-005 1 I56-3534-003R

2251BR Intelligent Photoelectric

Smoke Sensor with Remote Test

Capability in Duct Applications

INSTALLATION AND MAINTENANCE INSTRUCTIONS

BEFORE INSTALLING

This sensor must be installed in compliance with the control panel system

installation manual. The installation must meet the requirements of the Au-

thority Having Jurisdiction (AHJ). Sensors offer maximum performance when

installed in compliance with the National Fire Protection Association (NFPA);

see NFPA 72.

GENERAL DESCRIPTION

Model 2251BR is a plug-in type smoke sensors that combines a photoelec-

tronic sensing chamber with addressable-analog communications. The sensor

transmits an analog representation of smoke density over a communication

line to a control panel. Rotary-decade switches are provided for setting the

sensor’s address.

Two LEDs on the sensor are controlled by the panel to indicate sensor status.

An output is provided for connection to an optional remote LED annunciator

(P/N RA400Z/RA100Z).

When 2251BR is used in duct applications with a DNR/DNRW, testing can be

done remotely using approved System Sensor test accessories, eliminating the

need for a test coil.

NOTE: Only System Sensor approved accessories may be used with the

2251BR.

The 2251BR requires compatible addressable communications to func-

tion properly. Connect the 2251BR sensor to listed-compatible control

panels only.

SPACING

System Sensor recommends spacing sensors in compliance with NFPA 72. In

low air flow applications with smooth ceilings, space sensors 30 feet apart.

For specific information regarding sensor spacing, placement, and special ap-

plications, refer to NFPA 72 or the System Smoke Detector Application Guide,

available from System Sensor.

Duct Applications: 2251BR is listed for use in ducts. See Duct Applications

Guide A05-1004-XX for details on pendant mount applications.

WIRING GUIDE

All wiring must be installed in compliance with the National Electrical Code,

applicable local codes, and any special requirements of the Authority Having

Jurisdiction. Proper wire gauges should be used. The installation wires should

be color-coded to limit wiring mistakes and ease system troubleshooting. Im-

proper connections will prevent a system from responding properly in the

event of a fire.

Remove power from the communication line before installing sensors.

1. Wire the sensor base (supplied separately) per the wiring diagram, Figure 1.

2. Set the desired address on the sensor address switches, see Figure 2.

3. Install the sensor into the sensor base. Push the sensor into the base

while turning it clockwise to secure it in place.

4. After all sensors have been installed, apply power to the control unit and

activate the communication line.

5. Test the sensor(s) as described in the TESTING section of this manual.

SPECIFICATIONS

Operating Voltage Range: 15 to 32 VDC

Standby Current: 300µA @ 24 VDC (one communication every 5 seconds with LED blink enabled)

Maximum Alarm Current (LED on:) 6.5 mA @ 24 VDC

Operating Humidity Range: 10% to 93% Relative Humidity, Non-condensing

Operating Temperature Range: 32°F to 120°F (0°C to 49°C) 2251BR

–4°F to 158°F (–20°C to 70°C) 2251BR in duct applications

Height: 2.0˝ (51 mm) installed in B210LP Base

Diameter: 6.1˝ (155 mm) installed in B210LP Base; 4.1˝ (104 mm) installed in B501 Base

Weight: 5.2 oz. (147 g)

CAUTION

Dust covers provide limited protection against airborne dust particles during

shipping. Dust covers must be removed before the sensors can sense smoke.

Remove sensors prior to heavy remodeling or construction.

FIGURE 1. WIRING DIAGRAM:

(–)

(+)

UL LISTED COMPATIBLE

CONTROL PANEL

CAUTION: DO NOT LOOP WIRE

UNDER TERMINAL 1 OR 2.

BREAK WIRE RUN TO PROVIDE

SUPERVISION OF CONNECTIONS.

CLASS A OPTIONAL WIRING

REMOTE

ANNUNCIATOR

(–)

(+)

C0129-02

Note: Only System Sensor approved accessories may be used with the 2251BR.

FIGURE 2. ROTARY DECADE ADDRESS SWITCHES:

TENS ONES

C0146-00

TAMPER-RESISTANCE

Model 2251BR includes a tamper-resistant capability that prevents its removal

from the bracket without the use of a tool. Refer to the base manual for details

on making use of this capability.

TESTING

Before testing, notify the proper authorities that the system is undergoing

maintenance, and will temporarily be out of service. Disable the system to

prevent unwanted alarms.

All sensors must be tested after installation and periodically thereafter. Test-

ing methods must satisfy the Authority Having Jurisdiction (AHJ). Sensors

offer maximum performance when tested and maintained in compliance with

NFPA 72.

The sensor can be tested in the following ways:

A. Functional: Magnet Test (P/N M02-04-01 or M02-09-00)

This sensor can be functionally tested with a test magnet. The test mag-

net electronically simulates smoke in the sensing chamber, testing the

sensor electronics and connections to the control panel.

1. Hold the test magnet in the magnet test area as shown in Figure 3.

2. The sensor should alarm the panel.

I56-3534-003R

3825 Ohio Avenue, St. Charles, Illinois 60174

1.800.SENSOR2; Fax: 630.377.6495

www.systemsensor.com

1 2

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Pagina 1 - Smoke Sensor with Remote Test

SS-400-005 1 I56-3534-003R2251BR Intelligent PhotoelectricSmoke Sensor with Remote TestCapability in Duct ApplicationsINSTALLATION AND MAINTENANCE IN

Pagina 2 - THREE-YEAR LIMITED WARRANTY

Two LEDs on the sensor are controlled by the panel to indicate sensor status. Coded signals, transmitted from the panel, can cause the LEDs to blin

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