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

1. Place the magnet against the cover opposite the test

REMOVABLE HEAD COVER

CLEANABLE SCREEN

HEAD COVER
REMOVAL SLOT

VANED CHAMBER

TEST SLOT

P/N RS24 (W/O THERMAL)

module slot to activate the test feature (see Figure

1).

2. The LEDs should latch on within 5 seconds indicating
alarm and annunciating the panel.

Detectors that fail these tests should be cleaned as de­scribed under MAINTENANCE and retested. If the detec­tors still fail these tests they should be returned for repair.

B. Calibrated Test Card (System Sensor no. R59-18-00)

1. Remove the detector cover by placing a small blad­ed screwdriver in the side slot of the detector cover,
twisting it slightly until the cover can be turned coun­terclockwise for removal.

2. Insert the NO ALARM end of the test card fully into the
test slot (see Figure 2) then slide it counterclockwise
until it stops.

3. Wait for at least 20 seconds. The detector should
NOT alarm.

4. Remove the test card by sliding it clockwise before
removing, then insert the ALARM end.

5. The LEDs should latch on within 20 seconds indi­cating alarm and annunciating the panel.

6. Put the cover back by gently rotating it clockwise until
it locks in place.

C. Test Module (System Sensor no. MOD400R)
The MOD400R is used with your DMM or voltmeter

to check the detector sensitivity as described in the
MOD400R’s manual.

D. Aerosol Generator (Gemini 501)
Set the generator to represent 4% to 5%/Ft. obscuration

as described in the Gemini 501 Manual. Using the bowl
shaped applicator, apply aerosol until the unit alarms.

Figure 2:

A78-1213-01

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

Maintenance

It is recommended that the detector be removed from its
mounting base to facilitate easier cleaning. The detector is
cleaned as follows:
NOTE: Before removing the detector, notify the proper

1. Remove the detector cover by placing a small bladed

D400-02-01 REV#-002 3 I56-1020-000

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.

screwdriver in the side slot of the detector cover, twisting
it slightly until the cover can be turned counterclockwise
for removal.

2. Vacuum the screen carefully without removing it. If fur­ther cleaning is required continue with Step 3, otherwise
skip to Step 6.

3. Remove the screen by pulling it straight out (see Figure

2). Vacuum the inside.

4. Clean the vaned chamber piece by vacuuming or blow­ing out dust and particles.

5. To replace the screen, orient it so that the arrow on top
aligns with the test module socket of the detector. Care-

fully push the screen onto the base making sure it ts

tightly to the chamber.

6. Replace the cover by gently rotating it clockwise until it
locks in place.

7. Reinstall the detector.

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

Please refer to insert for the Limitations of Fire Alarm Systems

System Sensor warrants its enclosed smoke detector to be free from defects in ma-

terials and workmanship under normal use and service for a period of three years

from date of manufacture. System Sensor makes no other express warranty for this

smoke detector. No agent, representative, dealer, or employee of the Company has

the authority to increase or alter the obligations or limitations of this Warranty. The

Company’s obligation of this Warranty shall be limited to the repair or replacement

of any part of the smoke detector which is found to be defective in materials or work-

manship under normal use and service during the three year period commencing

with the date of manufacture. After phoning System Sensor’s toll free number 1-

800-SENSOR2 (736-7672) for a Return Authorization number, send defective units

postage prepaid to: System Sensor, Repair Department, RA #__________, 6581

Kitimat Rd., Unit #6, Mississauga, Ontario, L5N 3T5. Please include a note describ-

ing the malfunction and suspected cause of failure. The Company shall not be obli-

D400-02-01 REV#-002 4 I56-1020-000
© System Sensor 2004

Three-Year Limited Warranty

gated to repair or replace units which are found to be defective because of damage,

unreasonable use, modications, or alterations occurring after the date of manu-

facture. In no case shall the Company be liable for any consequential or incidental

damages for breach of this or any other Warranty, expressed or implied whatsoever,

even if the loss or damage is caused by the Company’s negligence or fault. Some

states do not allow the exclusion or limitation of incidental or consequential dam-

ages, so the above limitation or exclusion may not apply to you. This Warranty gives

you specic legal rights, and you may also have other rights under common law.