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
Specifications
Size
Height:
2.4 inches (61 cm)
Add 0.5 inches (13 cm) for thermal model 2451TH
4.0 inches (101 cm)
Diameter:
Weight:
0.5 lb. (277 g)
Operating Temperature Range:
Operating Humidity Range:
Maximum Air Velocity:
Locking Alarm:
0°C to 49°C (32°F to 120°F)
10% to 93% Relative Humidity
3000 Ft./Min. (15 M/S)
Reset by momentary power interruption
135°F (57°C)
Fixed Temperature Thermal:
Before Installing
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.
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.
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.
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
Base Selection and Wiring Guide
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.
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.
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Testing
E. Direct Heat Test (2451TH only)
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.
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.
Detectors must be tested after installation and periodic
maintenance. To test the 2451:
NOTE: Before testing the detector, check to ensure that
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.
the LEDs are blinking. If they are not, the detector Notify the proper authorities that the detection system is
has lost power (check the wiring) or it is defective back on line.
(return for repair).
Detectors that fail these tests should be cleaned as described
A. Test Magnet (System Sensor model no. M02-04-00)
under MAINTENANCE and retested. If the detectors still
1. Place the magnet against the cover opposite the test fail these tests they should be returned for repair.
module slot to activate the test feature (see Figure
1).
2. The LEDs should latch on within 5 seconds indicating
Figure 2:
alarm and annunciating the panel.
REMOVABLE HEAD COVER
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.
TEST SLOT
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.
CLEANABLE SCREEN
P/N RS24 (W/O THERMAL)
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.
HEAD COVER
REMOVAL SLOT
VANED CHAMBER
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.
C0722-00
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.
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Maintenance
3. Remove the screen by pulling it straight out (see Figure
2). Vacuum the inside.
It is recommended that the detector be removed from its
mounting base to facilitate easier cleaning. The detector is
cleaned as follows:
4. Clean the vaned chamber piece by vacuuming or blow-
ing out dust and particles.
NOTE: Before removing the detector, notify the proper
authorities that the smoke detector system is 5. To replace the screen, orient it so that the arrow on
undergoing maintenance and will temporarily be
out of service. Disable the zone or system undergo-
ing maintenance to prevent unwanted alarms.
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.
1. Remove the detector cover by placing a small bladed 6. Replace the cover by gently rotating it clockwise until it
screwdriver in the side slot of the detector cover, twist-
ing it slightly until the cover can be turned counterclock-
wise for removal.
locks in place.
7. Reinstall the detector.
2. Vacuum the screen carefully without removing it. If fur- 8. Notify the proper authorities that the system is back on
ther cleaning is required continue with Step 3, otherwise
skip to Step 6.
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.
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
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