D200-63-00
1
I56-931-02
1112/24B and 1112/24BA Ionization
Smoke Detectors
INSTALLATION AND MAINTENANCE INSTRUCTIONS
A Division of Pittway
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
Before Installing
Please thoroughly read 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.
Specifications
Diameter:
5.5 inches (140 mm)
Height (including adapter bracket): 1.7 inches (43 mm)
Weight:
5.3 oz. (150 g)
Operating Temperature Range:
32
°
to 120
°
F (0
°
to 50
°
C)
Operating Humidity Range:
10% to 93% Relative Humidity, Noncondensing
Latching Alarm:
Reset by momentary power interruption
Relay Contact Ratings–
Resistive or inductive (60% power factor) load
Form A:
0.5A @ 30VAC/DC
Electrical Ratings
System Voltage nominal:
12 or 24 VDC
Minimum:
8.5 VDC
Maximum:
35 VDC
Maximum Ripple Voltage:
30% of nominal voltage (peak to peak)
Reset Voltage:
0.8 VDC minimum
Standby Current:
50
µ
A maximum
Alarm Current:
17 mA typical, 23 mA maximum @ 12V
19 mA typical, 25 mA maximum @ 24V
Reset Time:
0.3 seconds maximum
Start-up Time:
30 seconds maximum (after 60 second reset)
General Description
The 1112/24B and 1112/24BA are 4-wire ionization
smoke detectors that use a state-of-the-art sensing
chamber. These detectors are designed to provide open
area protection.
Installation of these detectors are simplified by the use
of an adapter bracket and a plug-in screw terminal block
that can be prewired to the system, allowing the detec-
tors to be easily installed or removed for cleaning. The
detector sensitivity can be tested in place using the
MOD400R Test Module.
An LED on the detector provides local visual indication of
the detector status. If power is applied to the detector, and
it is functioning normally in standby, the status LED blinks
every five seconds. The LED also latches on in alarm.
The 1112/24B also features visual indication that mainte-
nance is required; if the sensing chamber drifts out of its
sensitivity limits, the LED ceases to blink.
