Pittway SYSTEM SENSOR 2251 Installation And Maintenance Instructions

INSTALLATION AND MAINTENANCE INSTRUCTIONS
2251 and 2251T Intelligent
Photoelectronic Smoke Sensors

Specifications

Operating Voltage Range:
Standby Current:
Max. Alarm Current (LED on:)
Operating Humidity Range:
Operating Temperature Range:
Operating Temperature Range:
Heat Sensor:
Height:
Diameter:
Weight:
Additional Bases Available:

Before Installing

This sensor must be installed in compliance with the con-
trol panel system installation manual. The installation must
meet the requirements of the Authority Having Jurisdiction
(AHJ). Sensors offer maximum performance when installed
in compliance with the National Fire Protection Association
(NFPA); see NFPA 72.

General Description

Model 2251 is a plug-in type smoke sensor that combines a
photoelectronic sensing chamber with addressable-analog
communications. The sensor transmits an analog represen-
tation of smoke density over a communication line to a
control panel. Rotary-decade switches are provided for set-
ting the sensor's address. Two LEDs on the sensor are con-
trolled by the panel to indicate sensor status. An output is
provided for connection to an optional remote LED annun-
ciator (P/N RA400Z). Model 2251T features a fixed tem-
perature (135°F) heat detector.
The 2251 and 2251T require compatible addressable
communications 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 informa-
tion regarding sensor spacing, placement, and special
applications, refer to NFPA 72 or the System Sensor Guide
For Proper Use of System Smoke Detectors, available at no
charge from System Sensor (P/N I56-407-XX).
D200-80-00
15 to 32 VDC
300µA @ 24 VDC (one communication every 5 sec. with LED blink enabled)
6.5 mA @ 24 VDC
10% to 93% Relative Humidity, noncondensing
0° to 49°C (32° to 120°F); 2251
0° to 38°C (32° to 100°F); 2251T
135°F Fixed Temperature Electronic Thermistor
1.7 inches (43 mm) installed in B210LP Base
6.1 inches (155 mm) installed in B210LP Base
4.1 inches (104 mm) installed in B501 Base
3.6 oz. (102 g)
All 200/500 Series bases are compatible.
1
3825 Ohio Avenue, St. Charles, Illinois 60174
Duct Applications: 2251 and 2251T are listed for use in
ducts. See Duct Applications Guide A05-1004-XX for details
on pendant mount applications. Note: These products are
not listed for use inside duct smoke detectors.

Wiring Instructions

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. Improper connections will prevent
a system from responding properly in the event of a fire.
Remove power from the communication line before
installing sensors.
All wiring must conform to applicable local codes, ordi-
nances, and regulations.
1. Wire the sensor base (supplied separately) per the
wiring diagram, see 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.
A Division of Pittway
1-800-SENSOR2, FAX: 630-377-6495
I56-1236-03R