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

Technical Manuals Online! - http://www.tech-man.com

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

D400-08-00 2 I56-280-03

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

Technical Manuals Online! - http://www.tech-man.com

EOL
POWER
SUPERVISION
RELAY
MODULE

SUGGESTED
EOL
RESISTOR

A78-1554-01