System Sensor 1412A, 1424A Installation And Maintenance Instructions Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

1412A and 1424A Direct Wire
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: 2.0A @ 30VAC/DC

Electrical Ratings: 1412A 1424A

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 specied voltage ratings.

Reset Time: 0.3 0.3 Seconds
Start-up Time: 30 30 Seconds

6581 Kitimat Rd., Unit #6, Mississauga, Ontario, L5N 3T5

1-800-SENSOR2, FAX: [phone]

WWW.SYSTEMSENSOR.CA

Before Installing

Please thoroughly read the System Sensor manual I56­407-XX, Guide for Proper Use of System Smoke Detec-
tors, 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. Please also refer to CAN/ULC-S524,
Standard for the Installation of Fire Alarm Systems and
CEC Part 1, Sec. 32..

General Description

System Sensor 1412A and 1424A 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 ULC-listed 4-wire
control panels. The 1412A for 12 volt panels operates
at 12VDC, and the 1424A for 24 volt panels operates at
24VDC. The detectors’ operation and sensitivity can be
tested in place. These detectors are latching type system
detectors. When latched in alarm, the detectors must be
reset by a momentary power interruption.

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

D400-08-00 REV#-002 1 I56-1007-000

CAUTION

TAMPER

RESISTANT

TAB

TO MAKE DETECTOR TAMPER RESISTANT,

BREAK OFF TAB EXTENSION

AT SCRIBED LINE

Figure 1. Flush mounting of detector on 4 inch oc-

COMMON
N/O
N/C

AUXILIARY

CONTACTS

FORM C

4

5

6

7

8

2

1

+

-

POWER

ALARM

CONTACTS

FORM A

N/O

COMMON
N/O
N/C

(OPTIONAL)
RELEASING

DEVICE

4

5

6

7

8

2

1

+

-

COMMON
N/O
N/C

(OPTIONAL)
RELEASING

DEVICE

4

5

6

7

8

2

1

+

EOL
POWER
SUPERVISION
RELAY
MODULE
A77-716B

SUGGESTED
EOL
RESISTOR

CLASS A OPTIONAL WIRING

INITIATING

LOOP

POWER

TO

DETECTORS

ULC LISTED

COMPATIBLE

CONTROL

PANEL

+

-

+

-

-

tagonal box:

Figure 2. Detector mounting bracket:

A78-1554-02 A78-534-00

Mounting

Each 1412A and 1424A 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 CAN/ULC­S536. 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 sys-

tem from responding properly in the event of a re.

NOTE: Refer to releasing device manufacturer’s instal-

lation 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

specications for allowable loop resistance. Consult the
control panel manufacturer’s specications for the total

loop resistance allowed for the particular model control
panel being used before wiring the detector loops.
Wire connections are made by stripping about 3/8" of insu­lation from the end of the wire (use strip gauge molded in
base), sliding the bare end of the wire under the clamping

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

D400-08-00 REV#-002 2 I56-1007-000

A78-1811-00

A78-1554-01