INSTALLATION AND MAINTENANCE INSTRUCTIONS
2112/24S and 2112/24TS Photoelectronic Smoke Detectors
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
Specifications |
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Diameter: |
5.5 inches (140 mm) |
Height (including mounting bracket): |
1.9 inches (48 mm) |
Weight: |
5.3 oz. (150 g) |
Operating Temperature Range |
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Model 2112/24S: |
32° to 120° F (0° to 50° C) |
Model 2112/24TS: |
32° to 100° F (0° to 38°C) |
Operating Humidity Range: |
10% to 93% Relative Humidity, Noncondensing |
Latching Alarm: |
Reset by momentary power interruption |
Heat Sensor (2112/24TS only): |
135° F Fixed Temperature Electronic Thermistor |
Electrical Ratings |
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System Voltage (nominal): |
12 or 24 VDC |
Minimum: |
8.5 VDC |
Maximum: |
35 VDC |
Maximum Ripple Voltage: |
30% of nom. Voltage (peak to peak) |
Standby Current: |
50 A maximum |
Alarm Current: |
17 mA typical, 23 mA max. at 12V |
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19 mA typical, 25 mA max. at 24V |
Reset Voltage: |
0.8 VDC minimum |
Reset Time: |
0.3 seconds maximum |
Start-up Time: |
30 seconds maximum (after 60 sec. reset) |
EOL Relay: |
A77-716B, 12/24 Volt |
Alarm Initiation Contact Ratings |
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Resistive or Inductive Load (60% power factor) |
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Form A: |
0.5A @ 30 VAC/DC |
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Before Installing
Please thoroughly read the System Sensor manual I56-407,
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.
NOTICE: This manual shall be left with the owner/user of this equipment.
IMPORTANT: This detector must be tested and maintained following NFPA 72 requirements. The detector should be cleaned at least once a year.
General Description
Model 2112/24S is a 4-wire photoelectronic smoke detector that uses a state-of-the-art optical sensing chamber. This detector is designed to provide open area protection. Model 2112/24TS features a restorable, built-in, fixed-temperature (135° F) thermal detector.
Installation of these detectors is simplified by the use of a mounting bracket and a plug-in screw terminal block that can be prewired to the system, allowing the detector to be easily installed or removed for cleaning. The detector’s sensitivity can be tested in place using the MOD400R Test Module.
An LED on the detector provides a local visual indication of the detector’s status. If power is applied to the detector, and it is functioning normally in standby mode within the listed sensitivity ranges, the status LED blinks once every ten seconds. The LED also provides a visual indication that maintenance is required. If the LED stops blinking, the detector is either not powered, out of the listed sensitivity range, and/or unable to function properly. The test switch will not operate if the detector is below the insensitive limit. The LED will also latch on when the detector is in alarm.
D200-62-00 |
1 |
I56-932-12R |
Figure 1. Surface mounting of 2112/24S smoke detector on 31/2-inch and 4-inch octagonal box:
A78-2563-00
Mounting
Each 2112/24S and 2112/24TS detector is supplied with a mounting bracket that permits the detector to be mounted:
1.To a single gang box, or
2.Directly to a 31/2-inch or 4-inch octagonal box, or
3.To a 4 inch square electrical box by using a plaster ring.
4.Directly to the ceiling using drywall anchors, if permitted by local codes and/or the authority having jurisdic-
tion.
Tamper-resistant Feature
This detector includes a tamper-resistant feature that prevents its removal from the bracket without the use of a tool. To make the detector tamper-resistant, remove the smaller tab by breaking it 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.
Wiring Installation Guidelines
All wiring must be installed in compliance with the National Electrical Code, 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 reduce the likelihood of wiring errors. Improper connections can prevent a system from responding properly in the event of a fire.
The screw terminal block accepts 14 – 22 gauge wire. For best system performance, all wiring should be installed in
separate grounded conduit. Do not mix fire system wiring in the same conduit as any other electrical wiring. Twisted pair may be used to provide additional protection against electrical interference.
Smoke detectors and alarm system control panels have specifications for allowable loop resistance. Consult the control panel specifications for the total loop resistance allowed for the control panel being used before wiring the detector loops.
Wire connections are made by stripping about 1/4 inch of insulation from the end of the feed wire, inserting the wire into the appropriate terminal, and tightening the screw to secure the wire in place.
Installation
WARNING
Remove power from the control unit or initiating device circuits before installing detectors.
1.Wire the plug-in screw terminal block per Figure 3 and plug the terminal block into the detector.
2.Align the arrows on the detector with the arrows on the mounting bracket.
3.Turn the detector clockwise in the mounting bracket until it clicks into place.
4.After all detectors have been installed, apply power to the control unit or initiating device circuits.
5.Test the detector as described in TESTING. (See page 3.)
6.Reset the detector at the system control panel.
7.Notify the proper authorities the system is in operation.
CAUTION
Dust covers are an effective way to limit the entry of dust into smoke detector sensing chambers. However, they may not completely prevent airborne dust particles from entering the detector. Therefore, System Sensor recommends the removal of detectors before beginning construction or other dust producing activity. Be sure to remove dust covers from any sensors that were left in place during construction as part of returning the system to service.
Figure 2. 2112/24S and 2112/24TS smoke detector mounting bracket:
TAMPER SLOT (DEPRESS TAB TO REMOVE DETECTOR)
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ALIGNMENT |
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TAMPER RESISTANT TAB (CUT OFF SMALL TAB TO ACTIVATE TAMPER-RESIST FEATURE)
A78-2333-01
D200-62-00 |
2 |
I56-932-12R |
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