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 |
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Diameter: |
5.5 inches (14 cm) |
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Height, with Thermal: |
3.19 inches (8.1 cm) |
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Weight: |
0.7 lb. (310 g) |
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Operating Temperature: |
0° to 38° C (32° to 100° F) |
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Operating Humidity: |
10% to 95% Relative Humidity Non-condensing |
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Visual Indicator: |
Solid State LED |
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Locking Alarm: |
Reset by momentary power interruption |
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Audible Signal: |
85dBA minimum interrupted tone when individual unit is in alarm or when the |
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supply voltage is reversed. |
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Electrical Ratings: |
2412AT |
2424AT or 2424AIT |
Operating Voltage: |
12VDC |
24VDC |
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Full-wave, Unfiltered |
Full-wave, Unfiltered |
Current |
120 μA Max. |
120 μA Max. |
Standby: |
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Alarm: |
51mA |
43mA |
(Add 7mA Maximum with RA400Z Remote Annunciator LED) |
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Reversed Supply: |
8mA |
15mA |
Start-up Time: |
36 seconds maximum |
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Relay Characteristics: |
One Form A (SPST-NO) for alarm initiation 1.25A at 30 VAC/DC |
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Before Installing
Please thoroughly read the System Sensor manual I56-407- XX, 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 installations in Canada refer to CAN\ULCS524, Standard for the Installation of Fire Alarm Systems and CEC Part 1, Sec. 32.)
General Description
System Sensor 2412AT, 2424AT and 2424AIT photoelectronic smoke detectors are designed to provide open area protection and to be used with UL-listed 4-wire control panels. The 2412AT operates at 12 VDC and the 2424AT and 2424AIT operate at 24 VDC. The sensor in this detector operates on the light scattering principle and features a unique photo-optic sensing chamber that provides good smoke entry while minimizing the effects of ambient light. These detectors also provide restorable 135°F fixed-temperature heat detection. The 2412AT and 2424AT heat detection unit is integrated with the photoelectronic sensor while the 2424AIT’s heat detection unit is isolated from the photoelectronic smoke sensor and can be monitored separately. In addition, a piezoelectric horn in each detector produces an interrupted, 85 dBA
minimum tone when the individual detector alarms or when the supply voltage polarity is reversed.
An LED on each detector lights to provide a local alarm indication and will remain on when the supply polarity is reversed. A screw terminal is provided for a remote LED annunciator optional accessory (RA400Z). These detectors are listed to UL268 and are latching type system detectors. 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 slot after removing the detector’s cover.
Each detector contains one Form A (SPST-NO) contact for connection to an alarm-initiating circuit. Supervision of the 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 break in the detector power loop deenergizes the EOL Module. The relay contacts open and trigger a trouble signal at the control panel.
D400-04-00 |
1 |
I56-288-05 |
Figure 1. Flush mounting of detector on 4-inch octagon box:
A78-1411-00
Mounting Instructions
Each 2400 Series detector unit is supplied with a mounting bracket kit that permits several mounting techniques:
1.Units may be mounted directly to a 3-inch or 4-inch octagonal, 11/2 inch deep electrical box. (See Figures 1 and 2.)
2.Units may be mounted to a 4-inch square electrical box by using plaster ring with the supplied mounting bracket kit.
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, cut off smaller tab at the scribe line on tamper-proof tab located on the detector mounting bracket (see Figure 2). Install the detector. To remove the detector from the bracket once the tamperproof feature has been activated, depress the tamper-proof tab located in the slot on the mounting bracket and turn the detector counterclockwise for removal.
Installation In Australia Only
The installation temperature range for Australia is 5° to 45°C and has been tested per the Australian Standard. Ignore installation temperatures specified for all other applications when installing detectors in Australia. Detectors should be installed by qualified technicians. Installation of a mains connected power supply unit must be performed by qualified electricians only. The primary power will be provided by a panel type system. A rechargeable battery is required as a backup to the external power supply in case of a mains failure. In standby operation, the backup battery (fully charged) must be capable of providing uninterrupted power for at least 7 days to the
Figure 2. Detector mounting bracket:
TAMPER
RESISTANT
TAB
TO MAKE DETECTOR TAMPER RESISTANT, |
A78-534-00 |
BREAK OFF TAB EXTENSION
AT SCRIBED LINE
system and all smoke alarms before the panel gives the required battery-low signal. When the battery-low signal is given, the battery should be capable of providing power for another 7 days, after which the backup battery should have enough energy left to allow a 4-minute alarm signal to be given by all connected smoke alarms.
Wiring Installation Guidelines
All wiring must be 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.
For signal wiring (the wiring between interconnected detectors), wire no smaller than 18 AWG is recommended. Wire sizes up to 12 AWG may be used. For best system performance, the power (+and –) loop wires should be twisted pair and installed in separate grounded conduit or shielded cable to protect the loop from extraneous electrical interference. If a cable shield is provided, the shield connection to and from the detector must be continuous by using wire nuts, crimping, or soldering as appropriate for a reliable connection.
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 plate, and tightening the clamping plate screw. Do not loop the wire under the clamping plate.
Figure 3. Class A or Class B wiring diagram for model 2412AT and 2424AT detectors used with four-wire control panels:
D400-04-00 |
2 |
I56-288-05 |
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