System Sensor 2451A Installation And Maintenance Instructions Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

2451A Photoelectronic Plug-in
Smoke Detectors

Specifications

Size
Height: 2.4 inches (61 mm)
Add 0.5 inches (13 cm) for thermal model 2451THA
Diameter: 4.0 inches (101 cm)
Weight: 0.5 lb. (277 g)
Operating Temperature Range: 0° to 49°C (32° 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,
I56-407, 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. Please also refer to CAN/ULC-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 CAN/ULC-S536 requirements. This
sensor should be cleaned at least once a year.

General Description

The 2451A photoelectronic detector utilize state-of-the-art,
optical sensing chambers. This detector is designed to pro­vide open area protection, and to be used with compatible
ULC-listed control panels only. The capability of plugging
this detector into a variety of special bases makes it more
versatile than equivalent direct-wired models.
Two LEDs on each detector light to provide a local 360°
visible alarm indication. They ash every ten seconds indi­cating 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 ac-

cessory. This detector also has the Latching Alarm feature.
The alarm can be reset only by a momentary power inter­ruption. This detector 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 detector cover.

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.

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.

Installation

NOTE: Wiring must conform to applicable local codes,

NOTE: Verify that all detector bases are installed, that the

6581 Kitimat Rd., Unit #6, Mississauga, Ontario, L5N 3T5

ordinances, and regulations.

initiating-device circuits have been tested, and
that the wiring is correct. (Refer to detector base
manual for testing procedure.)

1-800-SENSOR2, FAX: [phone]

www.systemsensor.ca

D400-02-01 REV#-002 1 I56-1020-000

Disconnect power from initiating-device circuits before in-

PAINTED

SURFACE

TEST

MAGNET

LED

LED

TEST MODULE

SOCKET

TEST

MAGNET

stalling detectors.

1. Install detectors:
a. Place the detector into the detector base
b. Turn the detector clockwise until the detector drops

into place.

c. Continue turning detector clockwise to lock it in

place.

2. Tamper-proof Feature
The detector bases include a feature that, when acti-

vated, prevents removal of the detector without the use
of a tool. See the installation instruction manual of the
detector base for details in using this feature.

3. Afer all detectors have been installed, apply power to
the control unit.

4. Test the detector using the magnet or the test card as
described under TESTING.

5. Reset the detector at the system control panel.

Dust covers can be used to help limit dust entry to the
detector, but they are not a substitute for removing the
detector during building construction. Remove any dust
covers before placing system in service.

Testing

Before testing, notify the proper authorities that the smoke
detector system is undergoing maintenance and will tem­porarily be out of service. Disable the zone or system un­dergoing maintenance to prevent unwanted alarms.

Detectors must be tested after installation and periodic
maintenance. To test the 2451A:

NOTE: Before testing the detector, check to ensure that

the LEDs are blinking. If they are not, the detector
has lost power (check the wiring) or it is defective
(return for repair).

A. Test Magnet (System Sensor model no. M02-04-00)

6. Notify the proper authorities that the system is back on
line.

Figure 1. Bottom and side views showing position of test magnet:

D400-02-01 REV#-002 2 I56-1020-000

A78-1213-00