System Sensor 2451, 2451TH Manuel utilisateur

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

2451 and 2451TH Photoelectronic

Plug-in Smoke Detectors

INSTALLATION AND MAINTENANCE INSTRUCTIONS

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: 630-377-6495

www.systemsensor.com

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.

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)

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 2 I56-277-10R

Installation

NOTE: Wiring must conform to applicable local codes,

ordinances, and regulations.

NOTE: Verify that all detector bases are installed, that

the initiating-device circuits have been tested, and

that the wiring is correct. (Refer to detector base

manual for testing procedure.)

WARNING

Disconnect power from initiating-device circuits before

installing 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-Resistance: This detector includes a tamper-

resistant feature that prevents removal of the detector

without the use of a tool. To make the detector tamper-

resistant, break off the smaller tab at the scribed line

on the tamper-resistant tab, on the detector mounting

bracket, then install the detector. To remove the detector

from the bracket once it has been made tamper-resistant,

use a pocket screwdriver, or similar tool, to depress the

tamper-resistant tab located in the slot on the mounting

bracket. Then, turn the detector counterclockwise until

it separates from the base.

3. After 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.

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

line.

CAUTION

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.

CAUTION

Smoke detectors are not to be used with detector guards

unless the combination has been evaluated and found

suitable for that purpose.

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

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







 







C0495-00

D400-02-01 3 I56-277-10R

Testing

Before testing, notify the proper authorities that the smoke

detector system is undergoing maintenance and will tem-

porarily 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 2451:

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)

1. Place the magnet against the cover opposite the test

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.

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 counterclock-

wise 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 indicat-

ing 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.

E. Direct Heat Test (2451TH only)

To test the bi-metallic thermal collector, aim a heat source,

such as a low powered heat gun or blow dryer, across the

detector. Hold the heat source about 12 inches (30 cm)

from the detector to avoid damaging the plastic.

When the temperature rises to greater than 135°F

(57°C), the detector should latch into the alarm. The

bi-metallic collector automatically resets after the test.

Notify the proper authorities that the detection system is

back on line.

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.

Figure 2:

REMOVABLE HEAD COVER

CLEANABLE SCREEN

HEAD COVER

REMOVAL SLOT

VANED CHAMBER

TEST SLOT

P/N RS24 (W/O THERMAL)

C0722-00

D400-02-01 4 I56-277-10R

System Sensor warrants its enclosed smoke detector to be free from

defects in materials 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 obliga-

tion 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

workmanship under normal use and service during the three year period

commencing with the date of manufacture. After phoning System Sensor’s

toll free number 800-SENSOR2 (736-7672) for a Return Authorization

number, send defective units postage prepaid to: System Sensor, Repair

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

authorities that the smoke detector system is

undergoing maintenance and will temporarily be

out of service. Disable the zone or system undergo-

ing maintenance to prevent unwanted alarms.

1. Remove the detector cover by placing a small bladed

screwdriver in the side slot of the detector cover, twist-

ing it slightly until the cover can be turned counterclock-

wise for removal.

2. Vacuum the screen carefully without removing it. If fur-

ther 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 blow-

ing 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.

Carefully push the screen onto the base making sure it

fits 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

Three-Year Limited Warranty

Department, RA #__________, 3825 Ohio Avenue, St. Charles, IL 60174.

Please include a note describing the malfunction and suspected cause

of failure. The Company shall not be obligated to repair or replace units

which are found to be defective because of damage, unreasonable use,

modifications, or alterations occurring after the date of manufacture. 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 neg-

ligence or fault. Some states do not allow the exclusion or limitation of

incidental or consequential damages, so the above limitation or exclusion

may not apply to you. This Warranty gives you specific legal rights, and

you may also have other rights which vary from state to state.

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