System Sensor 2112-24R, 2112-24TR User Manual

D200-83-00 1 I56-1239-02R

2112/24R and 2112/24TR Photoelectronic
Smoke Detectors

INSTALLATION AND MAINTENANCE INSTRUCTIONS

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: [phone]

Specifications

Diameter: 5.5 inches (140 mm)
Height (including mounting bracket): 1.7 inches (43 mm)
Weight: 6.8 oz. (190 g)
Operating Temperature Range Model 2112/24R: 32°F to 120°F (0°C to 49°C)

Model 2112/24TR: 32°F to 100°F (0°C to 39°C)
Operating Humidity Range: 10% to 93% Relative Humidity, Noncondensing
Latching Alarm: Reset by momentary power interruption
Heat Sensor (Model 2112/24TR only): 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: 28 mA typical, 35 mA max. at 12V

36 mA typical, 45 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 VDC
Alarm Initiation and Auxiliary Relay: 1A @ 30 VAC
Contact Ratings, Resistive Load: 1A @ 30 VDC

Figure 1. Wiring diagram for the 2112/24R and 2112/24TR detector:

A78-2336-16

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

D200-83-00 2 I56-1239-02R

Figure 2. Surface mounting of 2112/24R and
2112/24TR smoke detector on 31⁄2-inch and 4-inch
octagonal box:

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A78-2563-01

Figure 3. 2112/24R and 2112/24TR smoke detector mounting bracket:

A78-2333-04

If the LED stops blinking, the unit should be removed for
maintenance and inspection.

Mounting

Each 2112/24R and 2112/24TR 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 tamper-resistant, 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.

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.

Before Installing

Please thoroughly read the 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 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

Models 2112/24R and 2112/24TR are 4-wire photoelectron­ic smoke detectors that use a state-of-the-art optical sens­ing chamber. The 2112/24TR also provides restorable,
135˚F fixed-temperature heat detection. The 2112/24TR
heat-detection unit is integrated with the photoelectronic
sensor.

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 ranges, the status LED blinks every ten seconds.
The LED also latches on in alarm.

TAMPER SLOT
(DEPRESS TAB TO
REMOVE DETECTOR)

TAMPER RESISTANT TAB
(CUT OFF SMALL TAB TO
ACTIVATE TAMPER-RESIST
FEATURE)

ALIGNMENT
ARROWS

D200-83-00 3 I56-1239-02R

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

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

I

N

T

A

P

T

O

N

O

D

LED

TEST MODULE
SOCKET

RECESSED TEST
SWITCH

PUSH RECESSED
SWITCH WITH A

0.18" MAX. DIAMETER TOOL

Figure 4. Top and side views showing position of test switch:

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 2112/24R and 2112/24TR 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 0.1 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 (Model 2112/24TR only – 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.

A78-2564-00

D200-83-00 4 I56-1239-02R

©

2001 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, Repair

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.

REMOVABLE
HOUSING

REMOVABLE
SCREEN

SENSING
CHAMBER
COVER

BASE

SENSING
CHAMBER

A78-2565-02

Figure 5. Removal of cover and screen for cleaning:

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: (Model 2112/24TR only) Before removing the detec-

tor 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 small­bladed screwdriver and pull the housing from the base.
Use caution to avoid damaging the thermistors,
(2112/24TR only).

2. Vacuum the screen carefully without removing it.

3. Remove screen assembly, pulling straight out (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.

Please refer to insert for the Limitations of Fire Alarm Systems