System Sensor 24ATR User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

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

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

IMPORTANT: OBSERVE POLARITY

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

POWER

DETECTORS

–

UL LISTED

COMPATIBLE

CONTROL

PANEL

INITIATING

LOOP

(OPTIONAL) RELEASING

DEVICE

COMMON

ALARM CONTACT

A NC

(OPTIONAL) RELEASING

DEVICE

COMMON

OPTIONAL CLASS A WIRING

3825 Ohio Avenue, St. Charles, Illinois 60174

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

EOL POWER SUPERVISION RELAY (SHOWN

–

ALARM CONTACT

A NC

ENERGIZED) A77-716 12/24V

EOL RESISTOR SPECIFIED BY PANEL MANUFACTURER

A78-2336-16

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 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.

Before Installing

Please thoroughly read the System Sensor manual I56-407,

NOTICE: This manual shall be left with the owner/user of

this equipment. 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.

D200-84-00 1 I56-1240-02R

IMPORTANT: This detector must be tested and maintained

following NFPA 72 requirements. The detector should be

cleaned at least once a year.

Figure 2. Surface mounting of 2112/24ATR smoke

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

LED

RECESSED TEST SWITCH

TEST MODULE SOCKET

detector on 3

/2-inch and 4-inch octagonal box:

A78-2563-03

General Description

Model 2112/24ATR 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 units have a heat detection unit that is integrated with the photoelectronic sensor. 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 Systems 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 2112/24ATR 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 3-1/2 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 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

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.

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

D200-84-00 2 I56-1240-02R

TAMPER SLOT (DEPRESS TAB TO REMOVE DETECTOR)

ALIGNMENT ARROWS

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

A78-2333-01

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