System Sensor 2451TH, 2451 User Manual
INSTALLATION AND MAINTENANCE INSTRUCTIONS
2451 and 2451TH Photoelectronic
3825 Ohio Avenue, St. Charles, Illinois 60174
Plug-in Smoke Detectors
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)
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.
Two LEDs on each detector light to provide a local 360°
visible alarm indication. They flash 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
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 detector 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.
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
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 compatible 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 detection unit. The capability of plugging these detectors into
a variety of special bases makes them more versatile than
equivalent direct-wired models.
D400-02-01 1 I56-277-10R
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.
Installation
WARNING
CAUTION
CAUTION
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.)
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 tamperresistant feature that prevents removal of the detector
without the use of a tool. To make the detector tamperresistant, 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.
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.
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:
C0495-00
D400-02-01 2 I56-277-10R
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