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: 630-377-6495
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
µ
A 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.
