INSTALLATION AND MAINTENANCE INSTRUCTIONS
2400 and 2400TH Direct Wire
3825 Ohio Avenue, St. Charles, Illinois 60174
Photoelectronic Smoke Detectors
Specifications
Diameter: 5.5 inches (140 mm)
Height: 3.14 inches (80 mm)
Add 0.5 inches (13 mm) for 2400TH
Weight: 0.7 lb. (310 gm)
Operating Temperature Range: Model 2400 — 0° to +49°C (32° to 120°F)
Model 2400TH — 0° to 38°C (32° to 100°F)
Operating Humidity Range: 10% to 93% Relative Humidity Non-condensing
Maximum Air Velocity: 3000 ft/min (15m/s)
Locking Alarm: Reset by momentary power interruption
Electrical Ratings
System Voltage: 12/24 VDC
Maximum Ripple Voltage: 4 Volts peak-to-peak
Start-up Capacitance: 0.02 µF Maximum
Standby Ratings: 8.5 VDC Minimum; 35 VDC Maximum
120 µA Maximum
Alarm Ratings: 4.2 VDC Minimum at 10 mA
6.6 VDC Maximum at 100 mA
Alarm current must be limited to 100mA maximum by the control panel. If used, the
RA400Z Remote Annunciator operates within the specified detector alarm currents.
Reset Voltage: 2.5 VDC Minimum
Reset Time: 0.3 S Maximum
Start-up Time: 34 S Maximum
1-800-SENSOR2, FAX: 630-377-6495
Before Installing
Please thoroughly read the System Sensor manual A051003, Applications Guide for System Smoke Detectors. This
manual provides detailed information on detector spacing,
placement, zoning, wiring, and special applications. Copies
of this manual are available at no charge from System
Sensor (For installations in Canada refer to CAN4-S524,
Standard for the Installation of Fire Alarm Systems and
CEC Part 1, Sec. 32).
NOTICE: This manual should be left with the owner/user
of this equipment.
IMPORTANT: This sensor must be tested and maintained
regularly following NFPA 72 requirements. This sensor
should be cleaned at least once a year.
General Description
System Sensor 2400 photoelectronic detectors use stateof-the-art, optical sensing chambers. These detectors are
designed to provide open area protection, and are intended
for use with compatible UL-listed 2-wire control panels
only. The detector’s operation and sensitivity can be tested
in place. Model 2400TH has the same specifications as
D400-05-00 1 I56-285-05R
model 2400, but also features a restorable, built-in, fixed
temperature (135°F) thermal detection unit.
These detectors are listed to UL 268 and are latching type
system detectors. When latched in alarm, the detectors
must be reset by a momentary power interruption.
An LED on the detector provides a local indication of the
detector’s status. This LED blinks every 10 seconds when
the detector is receiving power and ready in standby and
is latched on continuously in alarm until the detector is
reset. The detector provides an output for connection to
an optional Remote Annunciator (Model RA400Z). The
Remote Annunciator mounts to a single gang box and provides a supplementary alarm indication.
Spacing
NFPA 72E defines the spacing requirements for smoke
detectors, typically 30 feet when detectors are installed on
a smooth ceiling. However, ALL installations must comply
with NFPA 72 and/or special requirements of the authority
having jurisdiction.
TAMPER
RESISTANT
TA
B
TO
MAKE DETECTOR TAMPER RESISTANT,
BREAK OFF TAB EXTENSION
AT
SCRIBED LINE
on 31⁄2-inch and 4-inch octagonal box:
+
REMOTE
ANNUNCIATOR
–
+
–
+
REMOTE
ANNUNCIATOR
CLASS A OPTIONAL WIRING
NOTE: IF REMOTE ANNUNCIATOR IS NOT USED, POLARITY TO DETECTOR MAY BE REVERSED.
EOL
RESISTOR
INITIATING
LOOP
UL LISTED
COMPATIBLE
CONTROL
PANEL
+
–
–
–
+
3
2
1
3
2
1
Figure 2. 2400 Smoke detector mounting bracket:Figure 1. Flush mounting of 2400TH smoke detector
S0166-00
Mounting
Each 2400 detector is supplied with a mounting bracket kit
that permits the detector to be mounted:
1. Directly to a 31⁄2-inch or 4-inch octagonal, 11⁄2-inch deep
electrical box, (See Figure 1) or:
2. To a 4-inch square electrical box by using the plaster
ring with the supplied mounting bracket kit.
Installation Wiring Guidelines
All wiring must be installed in compliance with the National
Electrical Code and all 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.
For signal wiring (wiring between interconnected detectors), wire no smaller than AWG 18 is recommended.
However, the screws and clamping plate in the base can
accommodate wire sizes up to AWG 12. The use of twisted
pair wiring for the power (+ and –) loop is recommended
to minimize the effects of electrical interference.
Smoke detectors and alarm system control panels have
specifications for allowable loop resistance. Consult the
control panel manufacturer’s specifications for the total
loop resistance allowed for the control panel being used
before wiring the detector loops.
S0140-00
Make wire connections by stripping about 3⁄8 inch of insulation from the end of the wire and sliding the bare end
of the wire under the clamping plate, and tightening the
clamping plate screw. A wiring diagram for a typical 2-wire
detector system is shown in Figure 3.
System Sensor’s 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 control units and detectors. A copy of this list is
available from System Sensor upon request.
NOTE: For system supervision — do not loop wire under
terminals 1 and 2.
NOTE: If remote annunciator is not used, polarity to
detector may be reversed.
Tamper-resistant Feature
This detector includes a tamper-resistant feature that prevents removal of the detector without the use of a tool. To
make the detector tamper-resistant, break off the smaller
tab at the scribed line on the tamper resistant 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
for removal.
Figure 3. Wiring diagram for 2400 smoke detector used with two-wire control panel:
D400-05-00 2 I56-285-05R
S0141-00
Installation
WARNING
CAUTION
CAUTION
Disable the power from initiating device circuits before
installing detectors.
1. Wire each detector following installation guidelines.
2. Line up arrows on the detector with arrows on the
mounting bracket.
3. Turn the detector clockwise until it clicks into place.
4. After all detectors have been installed, apply power to
the control unit.
5. Test the detector as described under TESTING.
6. Reset the detector at the system control panel.
7. Notify the proper authorities the system is in operation.
Dust covers can be used to help limit dust entry to the detector. However, these covers are not a substitute for removing
the detector during building construction. Remove any dust
covers before placing the system in service.
Smoke detectors are not to be used with detector guards
unless the combination has been evaluated and found suitable for that purpose.
Testing
Before testing, notify the proper authorities that the smoke
detector system is undergoing maintenance, and the system
will be temporarily out of service. Disable the zone or system undergoing maintenance to prevent unwanted alarms.
Before testing the detector, look for the presence of the
flashing LED. If it does not flash, power has been lost to
the detector (check the wiring), or it is defective (return for
repair – refer to Warranty information).
Detectors must be tested after installation and following
periodic maintenance. The 2400/2400TH may be tested as
follows:
A. Functional Tests
Recessed Test Switch
1. A 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.
3. The detector’s LED should light within 5 seconds.
B. Calibrated Test Card (R59-18-00)
1. Remove the detector cover by placing a small bladed
screwdriver in the side slot of the detector cover,
twisting it slightly until the cover can be turned
counterclockwise for removal.
2. Insert the NO ALARM end of the test card fully into
the test slot (See Figure 5) then slide it counterclockwise until it stops.
3. The detector should not alarm after 20 seconds.
4. Remove the test card by sliding it clockwise before
removing, then insert the ALARM end.
5. The LED should latch on within 20 seconds. An alarm
should also be initiated at the panel.
6. Put the cover back by gently rotating it clockwise until
it locks in place.
C. Test Module (System Sensor No. MOD400R/MOD400).
The MOD400R or MOD400 Test Module is used with an
analog or digital voltmeter to check the detector sensitiv-
ity as described in the test module’s manual.
D. Aerosol Generator (Gemini 501).
Set the aerosol generator to represent 4%/ft. to 5%/ft.
obscuration as described in the Gemini 501 manual.
Using the bowl shaped applicator, apply aerosol until
unit alarms.
E. Direct Heat Test (2400TH only).
To test the bi-metallic thermal collector on the 2400TH,
use a low powered heat gun or blow dryer, aiming the
heat source across the detector. Hold the heat source
about 12 inches (30 cm) from the detector to avoid dam-
aging the plastic. When the heat rises to greater than
135°F, the detector will latch in alarm. After the test, the
bi-metallic collector will self-restore.
Notify the proper authorities that the system is back on line.
Detectors that fail these tests should be cleaned as described
Figure 4. Top and side views showing position of
test switch:
S0167-00
D400-05-00 3 I56-285-05R
under MAINTENANCE and retested. If the detectors still fail
these tests, they should be returned for repair.
Maintenance
REMOVABLE HEAD COVER
CLEANABLE SCREEN
HEAD COVER
REMOVAL SLOT
VANED CHAMBER
TEST SLOT
P/N RS24 (W/O THERMAL)
NOTE: Before removing the detector, notify the proper
authorities the smoke detector system is undergoing maintenance and, therefore, will be temporarily
out of service. Disable the zone or system undergoing maintenance to prevent unwanted alarms.
1. Remove the detector cover by placing a small bladed
screwdriver in the side slot of the detector cover, twisting it slightly until the cover can be turned counterclockwise for removal.
2. Vacuum the screen carefully without removing it. If further cleaning is required continue with step 3, otherwise
skip to step 6.
3. See Figure 5. Remove the screen by pulling it straight
out. Vacuum the inside.
4. Clean the vaned chamber piece by vacuuming or blowing out dust and particles.
5. To replace the screen, orient it so that the arrow on
top aligns with the test module socket of the detector.
Carefully push the screen onto the base, making sure it
fits tightly to the chamber.
6. Replace the cover by gently rotating it clockwise until it
locks in place.
7. Notify the proper authorities the system is back on line.
Figure 5. Removal of cover and screen for cleaning:
S0288-00
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
D400-05-00 4 I56-285-05R
Please refer to insert for the Limitations of Fire Alarm Systems
Three-Year Limited Warranty
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.
© 2004 System Sensor
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