INSTALLATION AND MAINTENANCE INSTRUCTIONS
2412AT, 2424AT, and 2424AIT
Direct Wire Photoelectronic with
Fixed Heat Smoke Detectors
A Division of Pittway
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
Specifications
Diameter:
5.5 inches (14 cm)
Height, with Thermal:
Weight:
3.19 inches (8.1 cm)
0.7 lb. (310 g)
Operating Temperature:
Operating Humidity:
Visual Indicator:
Locking Alarm:
Audible Signal:
0° to 38° C (32° to 100° F)
10% to 95% Relative Humidity Non-condensing
Solid State LED
Reset by momentary power interruption
85dBA minimum interrupted tone when individual unit is in alarm or when the
supply voltage is reversed.
Electrical Ratings:
Operating Voltage:
2412AT
12VDC
2424AT or 2424AIT
24VDC
Full-wave, Unfiltered
Full-wave, Unfiltered
Current
Standby:
Alarm:
120 µA Max.
120 µA Max.
51mA
43mA
(Add 7mA Maximum with RA400Z Remote Annunciator LED)
Reversed Supply:
8mA
15mA
Start-up Time:
36 seconds maximum
Relay Characteristics:
One Form A (SPST-NO) for alarm initiation 1.25A at 30 VAC/DC
Before Installing
minimum tone when the individual detector alarms or
Please thoroughly read the System Sensor manual I56-407- when the supply voltage polarity is reversed.
XX, Guide for Proper Use of System Smoke Detectors, which
provides detailed information on detector spacing, An LED on each detector lights to provide a local alarm
placement, zoning, wiring, and special applications. Copies indication and will remain on when the supply polarity is
of this manual are available at no charge from System reversed. A screw terminal is provided for a remote LED
Sensor. (For installations in Canada refer to CAN\ULC- annunciator optional accessory (RA400Z). These detectors
S524, Standard for the Installation of Fire Alarm Systems are listed to UL268 and are latching type system detectors.
and CEC Part 1, Sec. 32.)
The alarm can be reset only by momentary power
interruption. For testing, these detectors have a test switch
or may be tested by inserting a calibrated test card in a test
2424AIT slot after removing the detector’s cover.
General Description
System
Sensor
2412AT,
2424AT
and
photoelectronic smoke detectors are designed to provide
open area protection and to be used with UL-listed 4-wire Each detector contains one Form A (SPST-NO) contact for
control panels. The 2412AT operates at 12 VDC and the connection to an alarm-initiating circuit. Supervision of the
2424AT and 2424AIT operate at 24 VDC. The sensor in this detector power is accomplished by installing a Power
detector operates on the light scattering principle and Supervisory End-of-Line Relay Module (A77-716) at the end
features a unique photo-optic sensing chamber that of the detector power loop. When power is applied to and
provides good smoke entry while minimizing the effects of through the detectors, the EOL Power Supervisory Module
ambient light. These detectors also provide restorable is energized. Its relay contacts close and provide a closed
135°F fixed-temperature heat detection. The 2412AT and series circuit in the control panel’s alarm-initiating loop. A
2424AT heat detection unit is integrated with the power failure or break in the detector power loop de-
photoelectronic sensor while the 2424AIT’s heat detection energizes the EOL Module. The relay contacts open and
unit is isolated from the photoelectronic smoke sensor and trigger a trouble signal at the control panel.
can be monitored separately. In addition, a piezoelectric
horn in each detector produces an interrupted, 85 dBA
D400-04-00
1
I56-288-05
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