INSTALLATION AND MAINTENANCE INSTRUCTIONS
2412B, 2412THB, 2424, and 2424TH
Direct Wire Photoelectronic |
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3825 Ohio Avenue, St. Charles, Illinois 60174 |
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Smoke Detectors |
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1-800-SENSOR2, FAX: 630-377-6495 |
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ww.systemsensor.com |
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Specifications |
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Diameter: |
5.5 inches (14 cm) |
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Height: |
3.19 inches (81 mm); Add 0.5 inches (1.3 cm) for thermal units |
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Weight: |
0.7 lb (310 g) |
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Operating Temperature Range: |
2412 and 2424 — 0°C to +49°C (32°F to 120°F) |
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2412TH and 2424TH — 0° to +38°C (32° to 100°F) |
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Operating Humidity Range: |
10% to 93% Relative Humidity |
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Maximum Air Velocity: |
3000 Ft./Min. (15 M/S) |
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Latching Alarm: |
Reset by momentary power interruption. |
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Electrical Ratings |
2412 |
2424 |
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System Voltage: |
12 |
24 |
DC (4V Maximum Ripple) |
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Supply Voltage: |
11.3 |
20 |
VDC Minimum |
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17 |
29 |
VDC Maximum |
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Reset Voltage: |
.73 |
.8 |
VDC Minimum |
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Standby Current: |
120 |
120 |
µA Maximum |
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Alarm Currents: |
35 |
21.3 |
mA Minimum |
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77 |
40.6 |
mA Maximum |
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The alarm and auxiliary relay operate within the specified voltage ratings. |
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Start-up Time: |
34 |
34 |
S Maximum |
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EOL Relay: |
A77-716 |
A77-716 |
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Reset Time: |
0.3 |
0.3 |
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Relay Contacts – resistive or inductive (60% power factor) load: |
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Form A: |
2.0A @ 30VAC/DC |
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Form C:* |
0.6A @ 110VDC; 2.0A @ 30VDC |
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1.0A @ 125VAC; 2.0A @ 30VAC |
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(*For Canadian installations, relay contact rating is 2.0A @ 30VAC/DC)
Before Installing
Please thoroughly read the System Sensor manual A051003, 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/ULCS524, Standard for the Installation of Fire Alarm Systems and CEC Part 1, Sec. 32.)
General Description
System Sensor 2412 and 2424 photoelectronic smoke detectors utilize state-of-the-art, optical sensing chambers. These detectors are designed to provide open area protection, and to be used with compatible UL-listed 4-wire control panels only. The 2412 applies to 12 volt panels and operates at 12VDC, and the 2424 applies to 24 volt panels and operates at 24VDC. Operation and sensitivity can be tested in place. Models 2412TH and 2424TH have the same specifications as models 2412 and 2424, but in addition feature a built-in fixed temperature (135°F) thermal detection unit.
An LED on each detector lights to provide a local alarm indication. It flashes every ten seconds indicating that power is applied to the detector. The LED lights continuously in alarm. These detectors also have the latching alarm feature that resets only by a momentary power interruption.
Each detector contains one set of Form A contacts for connection to the alarm-initiating circuit, and one set of Form C auxiliary contacts. Supervision of detector power is accomplished by installing a Power Supervisory End-of-Line Relay Module (A77-716 Series) 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.
D400-06-00 |
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I56-286-05R |
Figure 1. Flush mounting of 2412/2424 smoke detector on 31⁄2 inch and 4-inch octagonal box:
Figure 2. 2412/2424 smoke detector mounting bracket:
S0168-00
Mounting
Each 2412 and 2424 detector is supplied with a mounting bracket kit that permits the detector to be mounted:
1.Directly to a 31⁄2 inch or 4 inch octagonal, 11⁄2 inch deep electrical box, (see Figure 1) or
2.To a 4 inch square electrical box by using a plaster ring with the supplied mounting bracket kit.
Installation Wiring Guidelines
NOTE: Refer to releasing device manufacturer’s installation instruction for proper connections.
All wiring must be installed in compliance with the National Electrical Code and all applicable local codes and any special requirements of the authority having jurisdiction, using the proper wire size. The conductors used to connect smoke detectors to control panels and accessory devices should be color-coded to reduce the likelihood of wiring errors. Improper connections can prevent a system from responding properly in the event of a fire.
For signal wiring (the wiring between interconnected detectors), it is recommended that the wire be no smaller than AWG 18. However, the screws and clamping plate, in the base, can accommodate wire sizes up to AWG 12. The use of twisted pair wiring for the power (+ and –) loop is recommended to minimize the effects of electrical interference.
TO MAKE DETECTOR TAMPER RESISTANT, |
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BREAK OFF TAB EXTENSION |
S0140-00 |
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AT SCRIBED LINE |
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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.
NOTE: 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.
NOTE: Contacts are shown in stand-by mode and will transfer in alarm condition.
Wire connections are made by stripping about 3⁄8 inch of insulation from the end of the wire, sliding the bare end of the wire under the clamping plate, and tightening the clamping plate screw.
Tamper-resistance Feature
This detector includes a tamper-resistant feature that prevents removal of the detector without the use of a tool. To make the detector tamper-resistant, break off the smaller tab at the scribed line on the Tamper Resistant Tab, on the detector mounting bracket (see Figure 2), then install the detector. To remove the detector from the bracket once it has been made tamper-resistant, use a small screwdriver to depress the tamper-resistant tab located in the slot on the mounting bracket and turn the detector counterclockwise for removal.
Figure 3. Wiring diagram for 2412/2424 series smoke detector used with 4-wire control panel:
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POWER |
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+ |
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- |
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2 |
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1 |
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COMMON |
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AUXILIARY |
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N/O |
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CONTACTS |
N/C |
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FORM C |
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8 |
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7 |
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4 5 |
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ALARM |
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CONTACTS |
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6 |
FORM A |
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N/O |
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S0164-00 |
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S0165-00
D400-06-00 |
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I56-286-05R |
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