System Sensor 1412, 2400, 2400TH, 2400AT, 2424AT Installation And Maintenance Instructions Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

1412 and 1424 Direct Wire

3825 Ohio Avenue, St. Charles, Illinois 60174

Ionization Smoke Detectors

Specifications

Diameter: 5.5 inches (14 cm)
Height: 3.12 inches (8.0 cm)
Weight: 0.7 lb (310 gm)
Operating Temperature: 0° to +49°C (32° 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
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

1-800-SENSOR2, FAX: [phone]

µ

A Maximum

A Division of Pittway

Before Installing

Please thoroughly read the System Sensor manual I56-407­XX, Guide for Proper Use of 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, Stan-
dard 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 con­trol 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.

D400-08-00 1 I56-280-03

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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-ener­gizes the EOL Module. The relay contacts open and trigger
a trouble signal at the control panel.

CAUTION

Figure 1. Flush mounting of detector on 4 inch
octagonal box:

Figure 2. Detector mounting bracket:

TAMPER

RESISTANT

TAB

A78-1554-02 A78-534-00

Mounting

Each 1412 and 1424 detector is supplied with a mounting
bracket kit that permits the detector to be mounted:

1. Directly to a 3-1/2 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 special 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
responding properly in the event of a fire.

TO MAKE DETECTOR TAMPER RESISTANT,

BREAK OFF TAB EXTENSION

AT SCRIBED LINE

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.

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 elec­trical 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.

Figure 3. Wiring diagram for models 1412 and 1424 detectors used with Class A or
Class B four-wire control panels.

POWER

+

-

2

1

AUXILIARY

CONTACTS

FORM C

COMMON
N/O
N/C

A78-1811-00

8

7

4

5

6

ALARM

CONTACTS

FORM A

N/O

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POWER

TO

DETECTORS

UL LISTED

CONTROL

PANEL

INITIATING

LOOP

+

-

(OPTIONAL)
RELEASING

DEVICE

COMMON
N/O
N/C

4

+

-

2

1

(OPTIONAL)
RELEASING

8

7

5

6

DEVICE

COMMON
N/O
N/C

4

+

-

2

1

8

7

5

6

+

-

CLASS A OPTIONAL WIRING

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EOL
POWER
SUPERVISION
RELAY
MODULE

SUGGESTED
EOL
RESISTOR

A78-1554-01

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.

Testing

NOTE: Before testing, notify the proper authorities that

the smoke detector system is undergoing mainte­nance, and therefore will temporarily be out of ser­vice. Disable the zone or system undergoing
maintenance to prevent unwanted alarms.

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
tamper-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 install­ing 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.

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
seconds.

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. obscura­tion 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.

Figure 4. Bottom and side view showing position of test switch:

RECESSED

TEST SWITCH

LED

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TAMPER SLOT

TEST MODULE

SOCKET

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PUSH RECESSED TEST SWITCH WITH
A 0.1" MAX. DIAMETER TOOL.

A78-1554-03

Maintenance

NOTE: Before starting, notify the proper authorities that

the smoke detector system is undergoing mainte­nance, 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.

Figure 5. Removal of cover and screen for cleaning:

LOCATION OF
THE LOCKING
PRONGS ON
COVER

REMOVABLE
COVER FOR
CLEANING

REMOVABLE SCREEN
(P/N RS14)

LOCK PRONG

78-1554-04

WARNING

The Limitations of Property Protection Smoke Detectors

This smoke detector is designed to activate and initiate emergency ac­tion, 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 de­lays 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

Three-Year Limited Warranty

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 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 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 Depart-

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types of fires. Ionization detectors offer a broad range of fire sensing capa­bility 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 de­velop in different ways and are often unpredictable in their growth, nei­ther 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 re­sulting from inadequate fire protection practices, violent explosions, es­caping gases which ignite, improper storage of flammable liquids like
cleaning solvents which ignite, other similar safety hazards, arson, smok­ing 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 dilu­tion of smoke densities created by frequent and rapid air exchanges. Addi­tionally, 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.

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, 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 negligence 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 1996