2100D and 2100TD Photoelectronic
Smoke Detectors
Height (including mounting bracket):
Operating Temperature Range:
Operating Humidity Range:
Latching Alarm:
Heat Sensor (Model 2100TD only):
Electrical Ratings
System Voltage –
Maximum Ripple Voltage:
Start-up Capacitance:
Standby Current:
Alarm Ratings:
Reset Voltage:
Reset Time:
Start-up Time:
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
5.5 inches (140 mm)
1.7 inches (43 mm)
5.3 oz. (150 g)
Model 2100D: 32° to 120°F (0° to 50°C)
Model 2100TD: 32° to 100°F (0° to 39°C)
10% to 93% Relative Humidity, Noncondensing
Reset by momentary power interruption
135°F Fixed Temperature Electronic Thermistor
12 or 24 VDC
8.5 VDC
35 VDC
30% of nom. Voltage (peak to peak)
0.02 µF maximum
50 µA maximum
4.2 VDC minimum at 10 mA.
6.6 VDC maximum at 100 mA.
(Alarm current must be limited to 100 mA maximum by the control panel. If
used, the RA400Z Remote Annunciator operates within the specified detector
alarm currents.)
2.5 VDC minimum
0.3 seconds maximum
30 seconds maximum (after 60 second reset)
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.
Installation of these detectors 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, the
status LED blinks every ten seconds. The LED also latches
on in alarm.
NOTICE: This manual should be left with the owner/user
of this equipment.
IMPORTANT: This detector must be tested and maintained
regularly following NFPA 72 requirements. The detector
should be cleaned at least once a year.
Models 2100D and 2100TD feature a visual indication that
maintenance is required – if the sensing chamber drifts out
of its sensitivity limits, the LED ceases to blink.
General Description
Model 2100D is a 2-wire photoelectronic smoke detector
that uses a state-of-the-art optical sensing chamber. This
detector is designed to provide open area protection and
to be used with compatible UL-listed panels only. Model
2100TD features a restorable, built-in, fixed-temperature
(135°F) thermal detector.
A Division of Pittway
The detectors also include an output that allows an optional
Model RA400Z Remote Annunciator to be connected.
Figure 1. Surface mounting of 2100D smoke detector
on 3 1/2-inch and 4-inch octagonal box:
The screw terminal block will accept 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
extraneous electrical interference.
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.
Each 2100D and 2100TD 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.
System Sensor smoke detectors are marked with a compatibility identifier located as the last digit of a five digit code
stamped on the back of the product. Connect detectors only
to compatible control units as indicated in System Sensor’s
compatibility chart which contains a current list of UL
listed compatible control units and detectors. A copy of this
list is available from System Sensor upon request.
Tamper-resistance 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 tamperresistant tab on the detector mounting bracket (see Figure
2), 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.
Remove power from the control unit or initiating-device
circuits before installing detectors.
1. Wire the plug-in screw terminal block per Figure 3 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 the following
6. Reset the detector at the system control panel.
7. Notify the proper authorities the system is in operation.
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.
Figure 2. 2100D and 2100TD smoke detector mounting bracket:
Figure 3. Wiring diagram for the 2100D and 2100TD detector:
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 2100TD 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.
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.
NOTE: Before testing, notify the proper authorities that the
smoke detector system is undergoing maintenance
and will temporarily be 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 2100D as follows:
A. Test Switch
1. A recessed test switch is located on the detector housing (See Figure 4).
2. Push 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
A detector that fails to activate with any of the above tests
should first be cleaned as outlined in the MAINTENANCE
section which follows. If the detector still fails to activate, it
should be returned for repair.
Notify the proper authorities the system is back on line.
NOTE: Before removing the detector, notify the proper
authorities that the smoke detector system is undergoing maintenance and will temporarily be out
of service. Disable the zone or system undergoing
maintenance to prevent unwanted alarms.
Figure 4. Top and side views showing position of test switch:
NOTE: (Model 2100TD only) 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 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 (2100TD only).
2. Vacuum the screen carefully without removing it.
3. Remove screen assembly, pulling straight out (see Figure
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
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 (2100TD).
9. Reinstall the detector.
10. Notify the proper authorities the system is back in operation.
Figure 5. Removal of cover and screen for cleaning:
The Limitations of Property Protection Smoke Detectors
This smoke detector is designed to activate and initiate emergency action, but will do so only when it is used in conjunction with an authorized
fire alarm system. This detector must be installed in accordance with
NFPA standard 72.
Smoke detectors will not work without power. AC or DC powered
smoke detectors will not work if the power supply is cut off.
Smoke detectors will not sense fires which start where smoke does
not reach the detectors. Smoldering fires typically do not generate a lot
of heat which is needed to drive the smoke up to the ceiling where the
smoke detector is usually located. For this reason, there may be large delays in detecting a smoldering fire with either an ionization type detector
or a photoelectric type detector. Either one of them may alarm only after
flaming has initiated which will generate the heat needed to drive the
smoke to the ceiling.
Smoke from fires in chimneys, in walls, on roofs or on the other side of a
closed door(s) may not reach the smoke detector and alarm it. A detector
cannot detect a fire developing on another level of a building quickly or
at all. For these reasons, detectors shall be located on every level and in
every bedroom within a building.
Smoke detectors have sensing limitations, too. Ionization detectors and
photoelectric detectors are required to pass fire tests of the flaming and
smoldering type. This is to ensure that both can detect a wide range of
types of fires. Ionization detectors offer a broad range of fire sensing ca-
pability but they are somewhat better at detecting fast flaming fires than
slow smoldering fires. Photoelectric detectors sense smoldering fires better than flaming fires which have little, if any, visible smoke. Because fires
develop in different ways and are often unpredictable in their growth, neither type of detector is always best, and a given detector may not always
provide early warning of a specific type of fire.
In general, detectors cannot be expected to provide warnings for fires
resulting from inadequate fire protection practices, violent explosions,
escaping gases which ignite, improper storage of flammable liquids like
cleaning solvents which ignite, other similar safety hazards, arson, smoking in bed, children playing with matches or lighters, etc. Smoke detectors
used in high air velocity conditions may have a delay in alarm due to
dilution of smoke densities created by frequent and rapid air exchanges.
Additionally, high air velocity environments may create increased dust
contamination, demanding more frequent maintenance.
To keep your equipment in excellent working order, ongoing maintenance
is required per the manufacturer’s recommendations and UL and NFPA
standards. At a minimum, the requirements of Chapter 7 of NFPA 72, the
National Fire Alarm Code, shall be followed. A preventative maintenance
agreement should be arranged through the local manufacturer’s representative. Though smoke detectors are designed for long life, they may fail at
any time. Any smoke detector, fire alarm equipment, or any component of
that system which fails shall be repaired or replaced as soon as possible.
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.
© System Sensor 1997