System Sensor 2251B, 2251TB, and 2251TMB Intelligent Photoelectric User Manual

System Sensor Equipment

SS-400-003

1 I56-3864-005R

2251B, 2251TB and 2251TMB
Intelligent Photoelectric Smoke Sensors

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
Models 2251B, 2251TB and 2251TMB are plug-in type smoke sensors that com-
bine a photoelectronic sensing chamber with addressable-analog communica-
tions. The sensors transmit 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). Models 2251TMB and 2251TB combine a photoelec-
tronic sensing chamber and 135°F (57.2°C) fixed temperature heat detector.
The 2251B, 2251TB and 2251TMB require compatible addressable commu-
nications to function properly. Connect these sensors 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: 2251B and 2251TB are listed for use in ducts. See Duct
Applications Guide A05-1004-XX for details on pendant mount applications.

Note: 2251B is listed for use inside DNR(W) duct smoke detectors.
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.

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.

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) 2251B; 32°F to 100°F (0°C to 38°C) 2251TB and 2251TMB

Heat Sensor:

135°F Fixed Temperature Electronic Thermistor

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)

fIgURE 1. WIRINg DIAgRAM:

(–)

(+)

LISTED COM

TIBLE

CONTROL

ANEL

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

fIgURE 2. ROTARy DECADE ADDRESS SWITChES:

TENS

ONES

1 0

C0146-00

TAMPER-RESISTANCE
Models 2251B, 2251TB and 2251TMB include a tamper-resistant capability
that prevents their 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.

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 blink, latch on, or latch off. Refer to the control panel technical docu-
mentation for sensor LED status operation and expected delay to alarm.

I56-3864-00

3825 Ohio Avenue, St. Charles, Illinois 60174

1.800.SENSOR2; Fax: 630.377.6495