System Sensor 2400, 2400TH User Manual
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
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