System Sensor 1424 User manual

D400-08-00 1 I56-280-05R
1412B and 1424 Direct Wire
Ionization Smoke Detectors
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: [phone]
www.systemsensor.com
Before Installing
Please thoroughly read the System Sensor manual A05-
1003, Applications Guide for System Smoke Detectors,
which provides detailed information on detector spacing,
placement, 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, Standard for the Installation of Fire Alarm Systems
and CEC Part 1, Sec. 32.)
General Description
System Sensor 1412 and 1424 dual-chamber ionization
smoke detectors utilize state-of-the-art, unipolar sensing
chambers. These detectors are designed to provide open
area protection, and to be used with UL-listed 4-wire con-
trol panels. The 1412 for 12 volt panels operates at 12VDC,
and the 1424 for 24 volt panels operates at 24VDC. The
detectors’ operation and sensitivity can be tested in place.
These detectors are listed to UL 268 and are latching type
system detectors. When latched in alarm, the detectors
must be reset by a momentary power interruption.
Specifications
Diameter: 5.5 inches (14 cm)
Height: 3.12 inches (8.0 cm)
Weight: 0.7 lb (310 gm)
Operating Temperature: 0°C to +49°C (32°F to 120°F)
Operating Humidity: 10% to 93% Relative Humidity Non-condensing
Locking Alarm: Reset by momentary power interruption.
Relay Contact Ratings
Resistive or Inductive (60% power factor) load
Form A: 2.0A @ 30VAC/DC
Form C:* 0.6A @ 110VDC, 2.0A @ 30VDC
1.0A @ 125VAC, 2.0A @ 30VAC
*For Canadian installations, relay contact rating is 2.0A @ 30VAC/DC
Electrical Ratings: 1412 1424
System Voltage: 12 24 DC (4V Maximum Ripple)
Supply Voltages: 11.3 20 VDC Minimum
17.3 29 VDC Maximum
Reset Voltages: .73 .8 VDC Minimum
Standby Current: 100 100 µA Maximum
Alarm Currents: 35.2 21.3 mA Minimum
77.0 40.6 mA Maximum
The alarm and auxiliary relay operate within the specified voltage ratings.
Reset Time: 0.3 0.3 Seconds
Start-up Time: 30 30 Seconds
An LED on the detector provides a local indication of the
detector’s status. If power is applied to the detector, and
the detector is functioning properly in standby, the status
LED will blink every 10 seconds. In alarm, the LED will be
latched on continuously until the detector is reset.
Each detector contains one Form A (SPST-NO) contact for
connection to the alarm-initiating circuit, and one Form
C (SPDT-NO/NC) set of auxiliary contacts. Supervision
of detector power is accomplished by installing a Power
Supervisory End-of-Line Relay Module (A77-716) at the end
of the detector power loop. When power is applied to and
through the detectors, the EOL Power Supervisory Module
is energized. Its relay contacts close and provide a closed
series circuit in the control panel’s alarm-initiating loop. A
power failure or a break in the detector power loop de-ener-
gizes the EOL Module. The relay contacts open and trigger
a trouble signal at the control panel.

D400-08-00 2 I56-280-05R
Mounting
Each 1412 and 1424 detector is supplied with a mounting
bracket kit that permits the detector to be mounted:
1. Directly to a 31 ⁄2 inch or 4 inch octagonal, 1
1
⁄2 inch deep
electrical box, or
2. To a 4 inch square electrical box by using a plaster ring
with the supplied mounting bracket kit.
Spacing
Spacing of 30 ft. on a smooth ceiling as per NFPA 72E.
Where conditions or response requirements vary, other
spacing may apply.
Wiring Installation Guidelines
All wiring must be installed in compliance with the National
Electrical Code and the applicable local codes, and any spe-
cial requirements of the local authority having jurisdiction.
Proper wire gauges should be used. The conductors used
to connect smoke detectors to control panels and accessory
devices should be color-coded to prevent wiring mistakes.
Improper connections can prevent a system from respond-
ing properly in the event of a fire.
NOTE: Refer to releasing device manufacturer’s installa-
tion instruction for proper connections.
NOTE: Contacts are shown in stand-by mode and will
transfer in alarm condition.
CAUTION
For system supervision: for terminals 1, 2, 7, and 8, do not
use looped wire under terminals. Break wire run to provide
system supervision of connections.
For signal wiring (the wiring between interconnected
detectors), it is recommended that the wire be no smaller
than 18 gauge. Wire sizes up to 12 gauge wire may be
used. For best system performance, the power (+) and (–)
loop wires should be twisted pair and installed in separate
grounded conduit to protect the loop from extraneous elec-
trical interference.
Smoke detectors and alarm system control panels have
specifications for allowable loop resistance. Consult the
control panel manufacturer’s specifications for the total
loop resistance allowed for the particular model control
panel being used before wiring the detector loops.
TAMPER
RESISTANT
TAB
TO MAKE DETECTOR TAMPER RESISTANT,
BREAK OFF TAB EXTENSION
AT SCRIBED LINE
Figure 1. Flush mounting of detector on 4 inch
octagonal box:
Figure 2. Detector mounting bracket:
S0139-00
S0140-00
COMMON
N/O
N/C
AUXILIARY
CONTACTS
FORM C
456
78
21
+-
POWER
ALARM
CONTACTS
FORM A
N/O
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A78-1811-00
S0165-00
Figure 3. Wiring diagram for models 1412 and 1424 detectors used with Class A or
Class B four-wire control panels.

D400-08-00 3 I56-280-05R
Wire connections are made by stripping about 3⁄8″ of insu-
lation from the end of the wire (use strip gauge molded in
base), sliding the bare end of the wire under the clamping
plate, and tightening the clamping plate screw. A typical
wiring diagram for a 4-wire detector system is shown in
Figure 3.
Tamper-proof Feature
This detector includes a tamper-proof feature that, when
activated, prevents removal of the detector without the use
of a tool. To activate this feature, break off the smaller tab
at the scribed line on the tamper-proof tab, located on the
detector mounting bracket (see Figure 2), then install the
detector. To remove the detector from the bracket once the
tamper-proof feature has been activated, depress the tam-
per-proof tab located in the slot on the mounting bracket
(see Figure 4) and turn the detector counterclockwise for
removal.
Installation
WARNING
Remove power from initiating-device circuits before install-
ing detectors.
1. Wire detector per installation guidelines.
2. Line up arrows on the detector with arrows on the
mounting bracket.
3. Turn the detector clockwise until it clicks into place.
4. After all detectors have been installed, apply power to
the control unit.
5. Test the detector as described under TESTING.
6. Reset the detector at the system control panel.
7. Notify the proper authorities the system is in operation.
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.
Testing
NOTE: Before testing, notify the proper authorities that
the smoke detector system is undergoing main-
tenance, and therefore will temporarily be out of
service. Disable the zone or system undergoing
maintenance to prevent unwanted alarms.
Before testing the detector, look for the presence of the
flashing LED. If it does not flash, power has been lost to
the detector (check the wiring), or it is defective (return for
repair, see warranty information).
Detectors must be tested after installation and following
periodic maintenance. The 1412 and 1424 may be tested
as follows:
A. Recessed Test Switch
1. A test switch is located on the detector housing (see
Figure 4).
2. Push and hold the recessed test switch with a 0.1 inch
maximum diameter tool.
3. The LED on the detector should light within 30 sec-
onds.
4. Reset the detector at the system control panel.
B. Test Module (System Sensor Model No. MOD400R)
The MOD400 or MOD400R is used with an analog or
digital voltmeter to check the detector sensitivity as
described 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 the 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.
PUSH RECESSED TEST SWITCH WITH
A 0.1" MAX. DIAMETER TOOL.
TEST MODULE
SOCKET
LED
RECESSED
TEST SWITCH
TAMPER SLOT
Figure 4. Bottom and side view showing position of test switch:
S0142-00

D400-08-00 4 I56-280-05R
©2004 System Sensor
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
Figure 5. Removal of cover and screen for cleaning:
LOCK PRONG
REMOVABLE SCREEN
(P/N RS14)
REMOVABLE
COVER
FOR
CLEANING
SENSING CHAMBER
Maintenance
NOTE: Before starting, notify the proper authorities that
the smoke detector system is undergoing main-
tenance, and therefore will temporarily be out of
service. Disable the zone or system undergoing
maintenance to prevent unwanted alarms.
The 1412 and 1424 are cleaned as follows:
1. Remove the detector screen and cover assembly by
depressing the three lock prongs on the top of the cover,
rotate the cover counterclockwise, and pull the screen
and cover assembly away from the detector (see Figure
5). Usage of System Sensor CRT400 cover removal 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. Test detector as described under TESTING.
6. Notify the proper authorities that the system is back on
line. S0138-00
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.