System Sensor 2451A User manual

D400-02-01 REV#-002 1 I56-1020-000
2451A Photoelectronic Plug-in
INSTALLATION AND MAINTENANCE INSTRUCTIONS
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. Cop-
ies 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 pro-
vide 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 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 ac-
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)
cessory. This detector also has the Latching Alarm feature.
The alarm can be reset only by a momentary power inter-
ruption. This detector may be tested by activating the inter-
nal 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,
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.)
Smoke Detectors 6581 Kitimat Rd., Unit #6, Mississauga, Ontario, L5N 3T5
1-800-SENSOR2, FAX: [phone]
www.systemsensor.ca

D400-02-01 REV#-002 2 I56-1020-000
Disconnect power from initiating-device circuits before in-
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.
6. Notify the proper authorities that the system is back on
line.
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 tem-
porarily be out of service. Disable the zone or system un-
dergoing 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)
Figure 1. Bottom and side views showing position of test magnet:
PAINTED
SURFACE
TEST
MAGNET
LED
LED
TEST MODULE
SOCKET
TEST
MAGNET
A78-1213-00

D400-02-01 REV#-002 3 I56-1020-000
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 blad-
ed screwdriver in the side slot of the detector cover,
twisting it slightly until the cover can be turned coun-
terclockwise 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 indi-
cating 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.
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
authorities that the smoke detector system is un-
dergoing maintenance and will temporarily be out
of service. Disable the zone or system undergoing
maintenance to prevent unwanted alarms.
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.
Figure 2:
REMOVABLE HEAD COVER
CLEANABLE SCREEN
HEAD COVER
REMOVAL SLOT
VANED CHAMBER
TEST SLOT
P/N RS24 (W/O THERMAL)
A78-1213-01
Detectors that fail these tests should be cleaned as de-
scribed under MAINTENANCE and retested. If the detec-
tors still fail these tests they should be returned for repair.

D400-02-01 REV#-002 4 I56-1020-000
© System Sensor 2004
Three-Year Limited Warranty
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-
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.
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. 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