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Installation AND MAINTENANCE INSTRUCTIONS
1112/24D Ionization Smoke Detector
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 1112/24D detector:
+
POWER
TO
DETECTORS
–
UL LISTED
CONTROL
PANEL
+
INITIATING
LOOP
–
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.
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
The 1112/24D is a 4-wire ionization smoke detector that
uses a state-of-the-art sensing chamber. This detector is
designed to provide open area protection.
D200-63-00
IMPORTANT: OBSERVE POLARITY
+
+
+
OPTIONAL CLASS A WIRING
: Observe polarity in power and initiating loops when wiring.
NOTE
+
+
+
Installation of this detector is simplified by the use of an
adapter 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
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 1112/24D also features visual indication that mainte-
nance is required; if the sensing chamber drifts out of its
sensitivity limits, the LED ceases to blink.
1
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
EOL POWER
SUPERVISION
RELAY (SHOWN
ENERGIZED)
A77-716B 12/24V
EOL RESISTOR
SPECIFIED BY
PANEL
MANUFACTURER
A78-2336-05
I56-931-06
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Related Manuals for System Sensor 1112/24D
Summary of Contents for System Sensor 1112/24D
- Page 1 General Description sensitivity limits, the LED ceases to blink. The 1112/24D is a 4-wire ionization smoke detector that uses a state-of-the-art sensing chamber. This detector is designed to provide open area protection.
- Page 2 Reset Time: 0.3 seconds maximum Start-up Time: 30 seconds maximum (after 60 second reset) Figure 2. Surface mounting 1112/24D detector on 3 Figure 3. 1112/24D detector mounting bracket: inch and 4 inch octagonal box: TAMPER RESISTANT TAB (CUT OFF SMALL TAB TO...
- Page 3 Remove power from the control unit or initiating device cir- Detectors must be tested after installation and following pe- cuits before installing detectors. riodic maintenance. Test the 1112/24D as follows: 1. Wire the plug-in screw terminal block per Figure 3 and A. Test Switch plug the terminal block into the detector.
- Page 4 Three-Year Limited Warranty System Sensor warrants its enclosed smoke detector to be free from de- ment, RA #__________, 3825 Ohio Avenue, St. Charles, IL 60174. Please fects in materials and workmanship under normal use and service for a include a note describing the malfunction and suspected cause of failure.
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