D200-62-00

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I56-932-12R

2112/24S and 2112/24TS

Photoelectronic Smoke Detectors

INSTALLATION AND MAINTENANCE INSTRUCTIONS

3825 Ohio Avenue, St. Charles, Illinois 60174

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

Before Installing

Please thoroughly read the System Sensor manual I56-407,

Guide for Proper Use of System Smoke Detectors, which pro-

vides 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.

Specifications

Diameter:

5.5 inches (140 mm)

Height (including mounting bracket):

1.9 inches (48 mm)

Weight:

5.3 oz. (150 g)

Operating Temperature Range

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

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

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

Resistive or Inductive Load (60% power factor)

Form A:

0.5A @ 30 VAC/DC

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 sen-

sitivity 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 sec-

onds. The LED also provides a visual indication that main-

tenance 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.