INSTALLATION AND MAINTENANCE INSTRUCTIONS
2112/24D(A) and 2112/24TD(A) Photoelectronic Smoke Detectors
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
IMPORTANT: OBSERVE POLARITY
This detector requires that you observe polarity when wiring. If wiring polarity is not observed on the initiating loop, the unit will send an alarm signal to the control panel to signify incorrect wiring.
Figure 1. Wiring diagram for the 2112/24D(A) and 2112/24TD(A) detectors:
POWER +
TO
DETECTORS
–
UL LISTED CONTROL PANEL
INITIATING+ LOOP –
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EOL POWER |
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SUPERVISION |
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RELAY (SHOWN |
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ENERGIZED) |
+ |
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+ |
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A77-716 12/24V |
P |
P |
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+ |
+ |
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– |
W |
– |
W |
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.N+ R |
.N+ R |
EOL RESISTOR |
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.O |
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.O |
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C– |
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C– |
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SPECIFIED BY |
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PANEL |
MANUFACTURER
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OPTIONAL CLASS A WIRING |
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: Observe polarity in power and initiating loops when wiring. |
A78-2336-03 |
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NOTE |
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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. (For installation in Canada, refer to CAN/ULC-S524-M91,
Standard for the Installation of Fire Alarm Systems, and CEC Part 1, sec. 32.)
NOTICE: This manual should 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 2112/24D(A) 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 2112/24TD(A) features a restoreable, built-in, fixedtemperature (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, the status LED blinks every ten seconds. The LED also latches on in alarm.
Models 2112/24D(A) and 2112/24TD(A) feature a visual indication that maintenance is required – if the sensing chamber drifts out of its sensitivity limits, the LED ceases to blink.
Mounting
Each 2112/24D(A) and 2112/24TD(A) 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.
Tamper-resistant Feature
This detector includes a tamper-resistant feature that prevents its removal from the bracket without the use of a
D200-62-00 |
1 |
I56-932-07 |
Specifications |
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Diameter: |
5.5 inches (140 mm) |
Height (including mounting bracket): |
1.7 inches (43 mm) |
Weight: |
5.3 oz. (150 g) |
Operating Temperature Range |
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Model 2112/24D(A): |
32° to 120°F (0° to 50°C) |
Model 2112/24TD(A): |
32° to 100°F (0° to 39°C) |
Operating Humidity Range: |
10% to 93% Relative Humidity, Noncondensing |
Latching Alarm: |
Reset by momentary power interruption |
Heat Sensor (2112/24TD(A) 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 µA 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 Load: |
0.1A @ 35 VDC |
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Figure 2. Surface mounting of 2112/24D(A) smoke detector on 31/2-inch and 4-inch octagonal box:
A78-2563-00
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 3), 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
CAUTION
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.
Be certain to observe polarity when wiring.
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
Installation
WARNING
Remove power from the control unit or initiating device circuits before installing detectors.
D200-62-00 |
2 |
I56-932-07 |
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