INSTALLATION AND MAINTENANCE INSTRUCTIONS
2112/24ATR
Photoelectronic Smoke Detector with
Fixed Heat and Integral Temp-3 Sounder
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
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
TO
DETECTORS
–
EOL POWER
SUPERVISION
RELAY (SHOWN
ENERGIZED)
+
+
–
+
+
–
P
W
R
P
W
R
A77-716 12/24V
A
A
ALARM
ALARM
UL LISTED
COMPATIBLE
CONTROL
PANEL
CONTACT
CONTACT
A
NC
C
A
NC
C
NC
COMMON
NO
NC
COMMON
NO
EOL RESISTOR
SPECIFIED BY
PANEL
A
U
X
A
U
X
(OPTIONAL)
RELEASING
DEVICE
(OPTIONAL)
RELEASING
DEVICE
MANUFACTURER
NO
NO
INITIATING
LOOP
OPTIONAL CLASS A WIRING
A78-2336-16
Specifications
Diameter:
Height (including mounting bracket): 2.05 inches (52 mm)
5.5 inches (140 mm)
Weight:
7.5 oz. (210 g)
Operating Temperature Range:
Operating Humidity Range:
Latching Alarm:
32° to 100°F (0° to 38°C)
10% to 93% Relative Humidity, Noncondensing
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):
Minimum:
12 or 24 VDC
10 VDC
Maximum:
35 VDC
Maximum Ripple Voltage:
Standby Current:
Alarm Current:
30% of nom. Voltage (peak to peak)
50 µA maximum
49 mA typical, 60 mA max. at 12V
57 mA typical, 65 mA max. at 24V
0.8 VDC minimum
1.0 second maximum
30 seconds maximum (after 60 sec. reset)
A77-716B, 12/24 VDC
Reset Voltage:
Reset Time:
Start-up Time:
EOL Relay:
Alarm Initiation and Auxiliary Relay: 1A @ 30 VAC
Contact Ratings, Resistive Load:
Special Considerations:
1A @ 30 VDC
Due to the built-in temporal pattern, use these detectors only with a non-coded
power supply.
NOTICE: This manual shall be left with the owner/user of
Before Installing
this equipment.
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.
IMPORTANT: This detector must be tested and maintained
following NFPA 72 requirements. The detector should be
cleaned at least once a year.
D200-84-00
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I56-1240-02R
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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.
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 de-
scribed in the test module’s manual.
Installation
WARNING
Remove power from the control unit or initiating device cir-
cuits before installing detectors.
C. Smoke Entry Test
Hold a smoldering punk stick or cotton wick at the side
of the detector and gently blow smoke through the de-
tector until the unit alarms.
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 un-
til 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.
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.
CAUTION
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 enter-
ing 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.
Notify the proper authorities the system is back in
operation.
Maintenance
NOTE: Before removing the detector, notify the proper au-
thorities that the smoke detector system is under-
going 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 posi-
tion of the thermistors. Make sure the thermistors
are not bent over when the housing is replaced.
Testing
NOTE: Before testing, notify the proper authorities that
the smoke detector system is undergoing mainte-
nance and will be temporarily out of service. Dis-
able the zone or system undergoing maintenance
to prevent unwanted alarms.
Detectors must be tested after installation and following
periodic maintenance. Test the 2112/24ATR as follows:
A. Test Switch
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.
1. A recessed test switch is located on the detector hous-
ing (See Figure 4).
2. Vacuum the screen carefully without removing it.
Figure 4. Top and side views showing position of test switch:
LED
PUSH RECESSED
SWITCH WITH A
0.18″ MAX. DIAMETER TOOL
RECESSED TEST
TEST MODULE
SWITCH
SOCKET
A78-2564-00
D200-84-00
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I56-1240-02R
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3. Remove screen assembly, pulling straight out (please Figure 5. Removal of cover and screen for cleaning:
see Figure 5).
4. Remove the sensing chamber cover.
5. Clean the sensing chamber by vacuuming or blowing
out dust and particles.
REMOVABLE
HOUSING
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.
REMOVABLE
SCREEN
8. Replace the housing by aligning the three triangular
slots on the base with their counterparts on the hous-
ing. Gently press the housing until it locks in place.
Check to make sure that the thermistors are in the up-
right position.
SENSING
CHAMBER
COVER
SENSING
CHAMBER
9. Reinstall the detector.
BASE
10. Notify the proper authorities that the system is back in
operation.
A78-2565-04
Please refer to insert for the Limitations of Fire Alarm Systems
Three-Year Limited Warranty
System Sensor warrants its enclosed smoke detector to be free from de-
fects 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 work-
manship under normal use and service during the three year period com-
mencing 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, Repair Depart-
ment, 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, modifica-
tions, 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 conse-
quential 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.
D200-84-00
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I56-1240-02R
2001 System Sensor
©
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