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
TO
DETECTORS
UL LISTED
COMPATIBLE
CONTROL
PANEL
INITIATING
LOOP
+
–
P
W
R
A
U
X
P
W
R
A
U
X
+
+
–
A
A
NC
C
NO
+
+
–
A
A
NC
C
NO
ALARM
CONTACT
ALARM
CONTACT
(OPTIONAL)
RELEASING
DEVICE
NC
COMMON
NO
(OPTIONAL)
RELEASING
DEVICE
NC
COMMON
NO
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
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
D200-85-00 3 I56-1241-03R
•
Put a smoke detector on every level of a multi-level residence. (See
Figure 3.)
• Install basement detectors on the ceiling at the bottom of the basement
stairwell. (See Figure 3.)
Figure 3: Recommended smoke detector protection for a multilevel residence:
• Install detectors on the ceiling as close to the center of the room as
possible. If this is not practical, install it on the ceiling no closer than
4 inches (10 cm) from any wall or corner. (See Figure 4.)
• If wall-mounting is permitted by local and state codes, and ceiling
mounting is not practical, install detectors on an inside wall between
4 and 6 inches (10 and 15 cm) from the ceiling. (See Figure 4.)
Figure 4: Recommended smoke detector mounting locations:
• Put detectors at both ends of a bedroom hallway if the hallway is more
than 30 feet (9 meters) long. In addition, large rooms will require more
than a single detector if the room is over 900 square feet.
• Rooms or areas that do not have smooth ceilings, or which have short,
transom-type walls coming down from the ceiling require additional
detectors.
• Install second-floor detectors on the ceiling at the top of the first-to-
second floor stairwell. Be sure no door or other obstruction blocks the
path of smoke to the detector.
• In rooms with sloped, peaked, or gabled ceilings, install detectors 3
feet (0.9 meter) measured down on the slant from the highest point of
the ceiling. See Figure 5.
Figure 5: Recommended smoke detector location in rooms with
sloped, gabled or peaked ceilings:
Where Smoke Detectors Should NOT Be Installed
• In or near areas where combustion particles are normally present
such as kitchens; in garages
where there are particles of combustion
in vehicle exhausts; near furnaces, hot water heaters, or gas space
heaters. Install detectors at least 20 feet (6 meters) away from
kitchens and other areas where combustion particles are normally
present.
HORIZONTAL
DISTANCE
FROM PEAK
3 FEET
(.9M)
BEST LOCATION
ACCEPTABLE LOCATION
DEAD AIR
SPACE
BEST IN CENTER
OF CEILING
NO CLOSER THAN 4" (10 cm)
FROM SIDE WALL
MOUNT ON WALL
AT LEAST 4" (10 cm)
FROM CEILING
NO MORE
THAN 6" (15 cm)
FROM CEILING
BEDROOM
BEDROOM BEDROOM
LIVING
ROOM
KITCHEN
BASEMENT
GARAGE
SMOKE DETECTORS FOR MINIMUM PROTECTION
SMOKE DETECTORS FOR MORE PROTECTION AND
REQUIRED IN NEW CONSTRUCTION
• On the ceiling in rooms next to kitchens where there is no transom
between the kitchen and these rooms. Instead, install the smoke detector on an inside wall, furthest from the kitchen (See Figure 6). Be sure
not to install smoke detectors within 4" of the ceiling or any corner or
more than 6" from the ceiling.
Figure 6: Recommended smoke detector locations to avoid air
streams with combustion particles:
• In damp or very humid areas, or next to bathrooms with showers.
The moisture in humid air can enter the sensing chamber as water
vapor, then cool and condense into droplets that cause a nuisance
alarm.
Install detectors at least 5 feet (1.5 meters) away from bath-
rooms.
• In very cold or very hot rooms or areas. Operating temperature of the
smoke detector is 32°F to 100°F (0°C to 38°C).
• In dusty, dirty, or insect-infested areas. Dust and dirt can build up on
the detector’s sensing chamber and make it overly sensitive, or can
block openings to the sensing chamber and keep the detector from
sensing smoke.
• Near fresh air inlets or returns or excessively drafty areas. Air conditioners, heaters, fans, and fresh air intakes and returns can drive
smoke away from smoke detectors, making the detectors less effective.
• In dead air spaces at the top of a peaked ceiling or wall/ceiling intersect. Dead air may prevent smoke from reaching a detector.
• Near fluorescent light fixtures. Install detectors at least 10 feet (3
meters) away from such light fixtures.
Installation Requirements
Warning: Electrical Shock Hazard. Turn off power at the main fuse box
or circuit breaker to the area of detector installation before beginning
installation procedures.
Remove power from the control unit or initiating device circuits before
installing detectors.
1. Wire the plug-in screw terminal block per Figure 1 and plug the terminal block into the detector.
2. Align the arrows on the detector with the arrows on the mounting
bracket.
3. Turn the detector clockwise in the mounting bracket until it clicks into
place.
4. After all detectors have been installed, apply power to the control unit
or initiating device circuits.
5. Test the detector as described in TESTING.
6. Reset the detector at the system control panel.
7. Notify the proper authorities the system is in operation.
Dust covers are an effective way to limit the entry of dust into smoke
detector sensing chambers. However, they may not completely prevent airborne dust particles from entering the detector. Therefore, System Sensor
recommends the removal of detectors before beginning construction or
other dust producing activity. Be sure to remove dust covers from any sensors that were left in place during construction as part of returning the system to service.
CAUTION
WARNING
CORRECT
AIR RETURN
BEDROOM
BATH
BEDROOM
LIVING
ROOM
INCORRECT
KITCHEN
STOVE
AIR INLET
A78-1171-03
A78-1171-04
A78-1171-05
A78-1171-06
D200-85-00 4 I56-1241-03R
©
2002 System Sensor
Three-Year Limited Warranty
System Sensor warrants its enclosed smoke detector to be free from
defects in materials and workmanship under normal use and service for a
period of three years from date of manufacture. System Sensor makes no
other express warranty for this smoke detector. No agent, representative,
dealer, or employee of the Company has the authority to increase or alter
the obligations or limitations of this Warranty. The Company’s obligation
of this Warranty shall be limited to the repair or replacement of any part
of the smoke detector which is found to be defective in materials or workmanship under normal use and service during the three year period commencing with the date of manufacture. After phoning System Sensor’s toll
free number 800-SENSOR2 (736-7672) for a Return Authorization number,
send defective units postage prepaid to: System Sensor, Returns
Smoke detectors shall be replaced after being in service for 10 years. However, any smoke detector, fire alarm equipment, or any component of that system which fails prior to that shall be repaired or replaced as soon as possible. Batteries shall be replaced upon indication of a pre-low battery condition.
Department, RA #__________, 3825 Ohio Avenue, St. Charles, IL 60174.
Please include a note describing the malfunction and suspected cause of
failure. The Company shall not be obligated to repair or replace units
which are found to be defective because of damage, unreasonable use,
modifications, or alterations occurring after the date of manufacture. In no
case shall the Company be liable for any consequential or incidental damages for breach of this or any other Warranty, expressed or implied whatsoever, even if the loss or damage is caused by the Company’s negligence
or fault. Some states do not allow the exclusion or limitation of incidental
or consequential damages, so the above limitation or exclusion may not
apply to you. This Warranty gives you specific legal rights, and you may
also have other rights which vary from state to state.
A78-2565-04
Figure 5. Removal of cover and screen for cleaning:
Testing
NOTE: Before testing, notify the proper authorities that the smoke
detector system is undergoing maintenance and will be temporarily out of service. Disable the zone or system undergoing
maintenance to prevent unwanted alarms.
Detectors must be tested after installation and following periodic maintenance. Test the 2112/24AITR as follows:
A. Test Switch
1. A recessed test switch is located on the detector housing (See
Figure 4).
2. Press and hold the recessed test switch with a 0.18 inch maximum
diameter tool such as an allen wrench or small screwdriver.
3. The detector’s LED should light within 5 seconds.
B. Test Module (System Sensor Model No. MOD400R).
The MOD400R test module can be used with a DMM or analog voltmeter to check the detector sensitivity as described in the test module’s manual.
C. Smoke Entry Test
Hold a smoldering punk stick or cotton wick at the side of the detector and gently blow smoke through the detector until the unit alarms.
D. Direct Heat Method (Hair dryer of 1000-1500 watts)
Direct the heat toward either of the side thermistors. Hold the heat
source about 12 inches from the detector in order to avoid damage to
the plastic. The detector will reset only after it has had sufficient time
to cool and the power source has been momentarily interrupted.
Both smoke and heat detection testing are recommended for verifying system protection capability.
A detector that fails to activate with any of the above tests should first be
cleaned as outlined in MAINTENANCE. If the detector still fails to activate, return it for repair.
Notify the proper authorities the system is back in operation.
REMOVABLE
HOUSING
REMOVABLE
SCREEN
SENSING
CHAMBER
COVER
BASE
SENSING
CHAMBER
Please refer to insert for the Limitations of Fire Alarm Systems
Maintenance
NOTE: Before removing the detector, notify the proper authorities that
the smoke detector system is undergoing maintenance and will
be temporarily out of service. Disable the zone or system
undergoing maintenance to prevent unwanted alarms.
NOTE: Before removing the detector cover, note the position of the
thermistors. Make sure the thermistors are not bent over when
the housing is replaced.
1. Remove the detector housing by gently prying the four housing tabs on
the bottom of the base with a small-bladed screwdriver and pull the
housing from the base. Use caution to avoid damaging the thermistors.
2. Vacuum the screen carefully without removing it.
3. Remove screen assembly, pulling straight out (please see Figure 5).
4. Remove the sensing chamber cover.
5. Clean the sensing chamber by vacuuming or blowing out dust and
particles.
6. Replace the sensing chamber cover, aligning the arrow on the cover
top with the arrow on the printed circuit board.
7. Replace the screen by placing the screen assembly over the sensing
chamber cover and twisting until it snaps into place.
8. Replace the housing by aligning the three triangular slots on the base
with their counterparts on the housing. Gently press the housing until
it locks in place. Check to make sure that the thermistors are in the
upright position.
9. Reinstall the detector.
10. Notify the proper authorities that the system is back in operation.
LED
RECESSED TEST
SWITCH
TEST MODULE
SOCKET
PUSH RECESSED
SWITCH WITH A
0.18″ MAX. DIAMETER TOOL
Figure 4. Top and side views showing position of test switch:
A78-2564-00
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