System Sensor 1451 User manual

D400-01-01 1 I56-278-05
INSTALLATION AND MAINTENANCE INSTRUCTIONS
A Division of Pittway
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: [phone]
Before installing
Please thoroughly read the System Sensor manual I56-407,
Applications Manual for System Smoke Detectors, which
provides detailed information on detector spacing, place-
ment, zoning, wiring, and special applications. Copies of
this manual are available at no charge from System Sensor.
(For installation in Canada refer to CAN/ULC-S524, Stan-
dard 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
Model 1451 dual chamber ionization detectors utilize state-of-
the-art, unipolar sensing chambers. These detectors are de-
signed to provide open area protection, and to be used with
compatible UL-listed control panels only. The capability of
plugging these detectors into a variety of special bases makes
them more versatile than equivalent direct-wired models.
Two LEDs on each detector light to provide a local 360°vis-
ible alarm indication. 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. For testing, these
detectors have an internal magnetically activated reed
switch.
1451 Plug-in Ionization
Smoke Detector
Specifications
Size
Height: 2.4 inches (6.1 cm)
Diameter: 4.0 inches (10.1 cm)
Weight: 0.6 lb. (277 g)
Operating Temperature Range: 0°to +49°C (32°to 120°F)
Operating Humidity Range: 10% to 93% Relative Humidity Non-condensing
Latching Alarm: Reset by momentary power interruption.
Model 1451 has been approved for marine use in dry loca-
tions by Underwriters Laboratory, Inc. The detector is to be
used in dry interior locations only.
Spacing
Spacing of 30 ft. on a smooth ceiling as per NFPA 72E.
Where conditions or response requirements vary, other
spacing may apply.
Base Selection And Wiring Guide
Refer to the installation instructions for the plug-in detector
bases for wiring instructions. System Sensor has available a
variety of detector bases for this smoke detector, including 2-
wire applications with and without relays and/or current lim-
iting 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 in-
stallation instructions.
Technical Manuals Online! - http://www.tech-man.com

D400-01-01 2 I56-278-05
Installation
NOTE: All 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.
WARNING
Remove power from initiating-device circuits before install-
ing 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. After all detectors have been installed, apply power to
the control unit.
4. Test the detector as described under TESTING.
5. Reset the detector at the system control panel.
6. Notify the proper authorities that the system is in
operation.
CAUTION
Dust covers can be used to help limit dust entry to the de-
tector, but they are not a substitute for removing the detec-
tor 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. The 1451 may be tested as follows:
Before testing the detector, look for the presence of the
flashing LEDs. If they do not flash, either power has been
lost to the detector (check the wiring), or it is defective (re-
turn for repair).
A. Test Magnet (System Sensor Model No. M02-04-00)
1. Place the magnet against the cover opposite the test
module socket. (See Figure 1.)
2. The LEDs on the detector should latch on within 30
seconds.
3. Reset the detector at the system control panel.
Figure 1. Botom and side views showing test magnet position:
PAINTED
SURFACE
TEST
MAGNET
TEST
MAGNET
LED
TEST MODULE
SOCKET
LED
A78-1161-00
Technical Manuals Online! - http://www.tech-man.com

D400-01-01 3 I56-278-05
Figure 2:
LOCK PRONG
REMOVABLE SCREEN
(P/N RS14)
REMOVABLE 
COVER
FOR
CLEANING
SENSING CHAMBER
A78-2340-00
B. Test Module (System Sensor Model No. MOD400R)
The MOD400 or MOD400R is used with a digital or ana-
log voltmeter to check the detector sensitivity as de-
scribed in the test module’s manual.
C. Aerosol Generator (Gemini 501)
Set the generator to represent 4%/ft. to 5%/ft. obscura-
tion as described in the Gemini 501 manual. Using the
bowl shaped applicator, apply aerosol until unit alarms.
Notify the proper authorities that the system is back on
line.
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.
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 au-
thorities that the smoke detector system is under-
going maintenance, and will temporarily be out of
service. Disable the zone or system undergoing
maintenance to prevent unwanted alarms.
1. Remove the detector screen and cover assembly by de-
pressing the three lock prongs on the top of the cover,
rotating the cover counterclockwise, and pulling the
screen and cover assembly away from the detector. (See
Figure 2.) Usage of a System Sensor CRT400 cover re-
moval tool is recommended.
2. Remove the screen from the cover.
3. Use a vacuum cleaner to remove dust from the screen,
the cover, and the sensing chamber.
4. After cleaning, snap the screen into the cover, then place
the cover and screen assembly on the detector, turning
clockwise until it is locked in place.
5. Reinstall the detector.
6. Test the detector as described under TESTING.
7. Notify the proper authorities that the system is back on
line.
Technical Manuals Online! - http://www.tech-man.com

D400-01-01 4 I56-278-05
© System Sensor 1996
This smoke detector is designed to activate and initiate emergency ac-
tion, but will do so only when it is used in conjunction with an authorized
fire alarm system. This detector must be installed in accordance with
NFPA standard 72.
Smoke detectors will not work without power. AC or DC powered
smoke detectors will not work if the power supply is cut off.
Smoke detectors will not sense fires which start where smoke does not
reach the detectors. Smoldering fires typically do not generate a lot of
heat which is needed to drive the smoke up to the ceiling where the
smoke detector is usually located. For this reason, there may be large de-
lays in detecting a smoldering fire with either an ionization type detector
or a photoelectric type detector. Either one of them may alarm only after
flaming has initiated which will generate the heat needed to drive the
smoke to the ceiling.
Smoke from fires in chimneys, in walls, on roofs or on the other side of a
closed door(s) may not reach the smoke detector and alarm it. A detector
cannot detect a fire developing on another level of a building quickly or at
all. For these reasons, detectors shall be located on every level and in
every bedroom within a building.
Smoke detectors have sensing limitations, too. Ionization detectors and
photoelectric detectors are required to pass fire tests of the flaming and
smoldering type. This is to ensure that both can detect a wide range of
types of fires. Ionization detectors offer a broad range of fire sensing capa-
bility but they are somewhat better at detecting fast flaming fires than
slow smoldering fires. Photoelectric detectors sense smoldering fires better
than flaming fires which have little, if any, visible smoke. Because fires de-
velop in different ways and are often unpredictable in their growth, nei-
ther type of detector is always best, and a given detector may not always
provide early warning of a specific type of fire.
In general, detectors cannot be expected to provide warnings for fires re-
sulting from inadequate fire protection practices, violent explosions, es-
caping gases which ignite, improper storage of flammable liquids like
cleaning solvents which ignite, other similar safety hazards, arson, smok-
ing in bed, children playing with matches or lighters, etc. Smoke detectors
used in high air velocity conditions may have a delay in alarm due to dilu-
tion of smoke densities created by frequent and rapid air exchanges. Addi-
tionally, high air velocity environments may create increased dust
contamination, demanding more frequent maintenance.
Smoke detectors cannot last forever. Smoke detectors contain electronic
parts. Even though smoke detectors are made to last over 10 years, any
part can fail at any time. Therefore, smoke detectors shall be replaced after
being in service for 10 years. The smoke detector system that this detector
is used in must be tested regularly per NFPA 72. This smoke detector
should be cleaned regularly per NFPA 72 or at least once a year.
WARNING
The Limitations of Property Protection Smoke Detectors
Three-Year Limited Warranty
System Sensor warrants its enclosed smoke detector to be free from de-
fects 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 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 com-
mencing 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 Depart-
ment, 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, modifica-
tions, 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 negligence or fault.
Some states do not allow the exclusion or limitation of incidental or conse-
quential 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.
Technical Manuals Online! - http://www.tech-man.com