System Sensor 2451TH specifications Specifications, Before Installing, General Description

INSTALLATION AND MAINTENANCE INSTRUCTIONS

2451 and 2451TH Photoelectronic Plug-in Smoke Detectors

3825 Ohio Avenue, St. Charles, Illinois 60174 1-800-SENSOR2, FAX: 630-377-6495 www.systemsensor.com

Specifications
Size
Height:	2.4 inches (61 cm)
	Add 0.5 inches (13 cm) for thermal model 2451TH
Diameter:	4.0 inches (101 cm)
Weight:	0.5 lb. (277 g)
Operating Temperature Range:	0°C to 49°C (32°F to 120°F)
Operating Humidity Range:	10% to 93% Relative Humidity
Maximum Air Velocity:	3000 Ft./Min. (15 M/S)
Locking Alarm:	Reset by momentary power interruption
Fixed Temperature Thermal:	135°F (57°C)

Before Installing

Please thoroughly read the System Sensor publication, A05-1003, Applications Guide for System Smoke Detectors, which provides detailed information on detector spacing, placement, zoning, wiring, and special applications. Copies of this guide are available at no charge from System Sensor. (For installations in Canada, refer to CAN4-S524, Standard for the Installation of Fire Alarm Systems and CEC Part 1, Sec. 32.)

NOTICE: This manual should be left with the owner/user of this equipment.

IMPORTANT: This sensor must be tested and maintained regularly following NFPA 72 requirements. This sensor should be cleaned at least once a year.

General Description

The 2451 photoelectronic detectors utilize state-of-the-art, optical sensing chambers. These detectors are designed to provide open area protection, and to be used with compat- ible UL-listed control panels only. Model 2451TH has the same specifications as Model 2451, with the addition of a built-in fixed temperature (135°F–57°C) thermal detec- tion unit. The capability of plugging these detectors into a variety of special bases makes them more versatile than equivalent direct-wired models.

Two LEDs on each detector light to provide a local 360° visible alarm indication. They flash every ten seconds indi- cating that power is applied and the detector is operating properly. The LEDs light continuously in alarm. Remote LED annunciator capability is available as an optional accessory. These detectors also have the Latching Alarm feature. The alarm can be reset only by a momentary power interruption. These detectors may be tested by activating the internal reed switch with a magnet, or by inserting a calibrated test card in a test slot after removing the detec- tor cover.

The 2451 has been approved for marine use in dry locations by Underwriters Laboratory, Inc. The detector is to be used in dry interior locations only.

Base Selection and Wiring Guide

Refer to the installation instructions for the Plug-in Detector Bases for base selection and wiring instructions. System Sensor has a variety of detector bases available for this smoke detector. This includes 2-wire applications with and without relays and/or current limiting resistors, 4-wire and 120VAC applications. (Note: the 120VAC detector base is not available in Canada.)

All bases are provided with screw terminals for power, ground, remote annunciator connections and relay contact connections, if applicable. The electrical ratings for each detector-base combination are also included in the base installation instructions.

D400-02-01 1 I56-277-10R