System Sensor 2112-24AITR User Manual

D200-85-00 1 I56-1241-03R

2112/24AITR Photoelectronic Smoke Detector with Fixed Heat and Integral Temp-3 Sounder

INSTALLATION AND MAINTENANCE INSTRUCTIONS

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: 630-377-6495

Specifications

Diameter: 5.5 inches (140 mm) Height (including mounting bracket): 2.05 inches (52 mm) Weight: 7.5 oz. (210 g) Operating Temperature Range: 32° to 100°F (0° to 38°C) Operating Humidity Range: 10% to 93% Relative Humidity, Noncondensing Latching Alarm: Reset by momentary power interruption Audible Signal: 85 dBA minimum when in alarm or with supply polarity reversed Heat Sensor: 135°F Fixed Temperature Electronic Thermistor

Electrical Ratings

System Voltage (nominal): 12 or 24 VDC

Minimum: 10 VDC

Maximum: 35 VDC Maximum Ripple Voltage: 30% of nom. Voltage (peak to peak) Standby Current: 50 µA maximum Alarm Current: 49 mA typical, 60 mA max. at 12V

57 mA typical, 65 mA max. at 24V Reset Voltage: 0.8 VDC minimum Reset Time: 1.0 second maximum Start-up Time: 30 seconds maximum (after 60 sec. reset) EOL Relay: A77-716B, 12/24 VDC

Note: Relay changes only when the thermal alarm state is reached Alarm Initiation and Auxiliary Relay: 1A @ 30 VAC Contact Ratings, Resistive Load: 1A @ 30 VDC Special Considerations: Due to the built-in temporal pattern, use these detectors only with a non-coded power supply.

Figure 1. Wiring diagram for the 2112/24AITR detector:

A78-2336-16

Before Installing

Please thoroughly read the System Sensor manual I56-407, Guide for Proper Use of System Smoke Detectors, which provides detailed informa-

tion 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.

IMPORTANT: OBSERVE POLARITY

As with all sounder models, polarity must be observed on the power connections.

OPTIONAL CLASS A WIRING

EOL RESISTOR SPECIFIED BY PANEL MANUFACTURER

EOL POWER SUPERVISION RELAY (SHOWN ENERGIZED) A77-716 12/24V

POWER

DETECTORS

UL LISTED

COMPATIBLE

CONTROL

PANEL

INITIATING

LOOP

–

A U X

+ + –

A A NC

+ + –

A A NC

ALARM CONTACT

(OPTIONAL) RELEASING

DEVICE

COMMON

(OPTIONAL) RELEASING

DEVICE

COMMON

D200-85-00 2 I56-1241-03R

TAMPER SLOT (DEPRESS TAB TO REMOVE DETECTOR)

TAMPER RESISTANT TAB (CUT OFF SMALL TAB TO ACTIVATE TAMPER-RESIST FEATURE)

ALIGNMENT ARROWS

Figure 3. 2112/24AITR smoke detector mounting bracket:

A78-2333-01

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 Where to Install Smoke Detectors

Warning: As a minimum requirement, smoke detectors must be installed in accordance with the National Fire Protection Agency (NFPA) Standard 72 which defines the standards for the National Fire Alarm Code (National Fire Protection Association, Batterymarch Park, MA 02269-9101). In addition, observe all local and national building and electrical codes.

Proper Detector Location: Figure 1: Recommended smoke detector protection for singlefloor residence with only one sleeping area

Figure 2: Recommended smoke detector protection for singlefloor residence with more than one sleeping area:

NFPA 72, Chapter 2, Section 2-2.1.1.1 states as follows: “Smoke detectors shall be installed outside of each separate sleeping area in the immediate vicinity of the bedrooms and on each additional story of the family living unit, including basements and excluding crawl spaces and unfinished attics. In new construction, a smoke detector also shall be installed in each sleeping room.”

The above NFPA standard is a minimum requirement for smoke detector installation. For better protection, we also require the installation of a smoke detector inside every bedroom in existing construction.

• Install a minimum of two smoke detectors in any household, no matter how small it is.

• Put a smoke detector in the hallway outside of every separate bedroom area. (See Figure 1.) A minimum of two detectors are required

in homes with two bedroom areas. (See Figure 2.)

BEDROOM

SMOKE DETECTORS FOR MINIMUM PROTECTION

SMOKE DETECTORS FOR MORE PROTECTION AND REQUIRED IN NEW CONSTRUCTION

BEDROOM

LIVING ROOM

DINING

ROOM

KITCHENFAMILY ROOM

DINING ROOM KITCHEN BEDROOM BEDROOM

BEDROOMLIVING ROOM

SMOKE DETECTORS FOR MINIMUM PROTECTION SMOKE DETECTORS FOR MORE PROTECTION AND

REQUIRED IN NEW CONSTRUCTION

General Description

Model 2112/24AITR is a 4-wire photoelectronic smoke detector that uses a state-of-the-art optical sensing chamber. This detector also provides restorable, 135˚F fixed-temperature heat detection. The photoelectronic smoke sensor is isolated from the fixed-temperature heat sensor, providing a self-resetting, local audible smoke alarm that does not alarm at the panel. Only the fixed-temperature heat sensor will cause the 2112/24AITR to alarm at the panel and the relay to change its state.

In addition, a piezoelectric horn in each detector produces an interrupted, 85 dBA tone when the individual detector alarms or when the supply voltage polarity is reversed.

NOTE: In order for all detectors on a loop to sound when the panel alarms, the panel must reverse the supply voltage polarity to that loop upon alarm. For panels that do not reverse the polarity during alarm, a reversing relay, such as System Sensor’s RR-2, must be used. The RR-2 is designed to allow all the detectors in the same loop to sound when one of the detectors goes into alarm. Some panels may require the use of programmable outputs. Refer to System Sensor literature for further information on the RR-2.

Installation of this detector 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 within the listed sensitivity range, the status LED blinks every ten seconds. The LED also latches on in alarm.

If the LED stops blinking, the unit should be removed for maintenance and inspection.

Mounting

Each 2112/24AITR 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 jurisdiction.

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 tamperresistant, 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.

A78-1171-01

A78-1171-02

Figure 2. Surface mounting of 2112/24AITR smoke detector on 31⁄2-inch and 4-inch octagonal box:

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A78-2563-03

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