System Sensor 2400AT, 2400AIT User Manual
INSTALLATION AND MAINTENANCE INSTRUCTIONS
2400AT and 2400AIT Direct Wire
Photoelectronic with Fixed Heat
3825 Ohio Avenue, St. Charles, Illinois 60174
Smoke Detectors
Specifications
Size: Diameter: 5.5 inches (140 mm)
Height: 3.19 inches (81 mm); add 0.5 inches (13 mm) for thermal units
Weight: 0.7 lb. (310 g)
Air Velocity: 3000 ft/min (15 M/s)
Operating Temperature: 0°C to 38°C (0° to 100°F)
Operating Humidity: 10% to 93% Relative Humidity, noncondensing
Visual Indicator: Solid State LED
Latching Alarm: Reset by Momentary Power Interruption
Audible Signal: 85dBA minimum interrupted tone when in alarm or supply voltage polarity is reversed
Fixed Temperature Thermal: 135°F (57°C)
Electrical Ratings
System Voltage: 24 VDC
Maximum Ripple Voltage: 4 Volts peak-to-peak
Start-up Capacitance: .02 µF Maximum
Start-up Time: 36 Sec. Maximum
Voltage Limits: 10 – 32 VDC
Current Limits
Standby: 120 µA Maximum; 100 µA Nominal
Alarm Current: 15mA at 10V; 67mA at 32V; 48mA at 24V
Reversed Supply: 5mA at 10V; 19mA at 32V; 15mA at 24V (Detector not in Alarm)
Alarm Impedance: 666 ohms Maximum; 478 ohms Minimum
Alarm Signal: 15mA Minimum in Alarm
1-800-SENSOR2, FAX: 630-377-6495
A Division of Pittway
Before Installing
Please thoroughly read the System Sensor manual I56-407XX, Guide for Proper Use of System Smoke Detectors. This
manual provides detailed information on detector spacing,
placement, zoning, wiring, and special applications. It is
available at no charge from System Sensor. (For installations in Canada refer to CAN/ULC4-S524, Standard for the
Installation of Fire Alarm Systems and CEC Part 1, Sec. 32.)
General Description
System Sensor 2400AT and 2400AIT photoelectronic smoke
detectors, listed to UL 268, provide open area protection
and are intended for use with UL-listed, compatible, 2-wire
control panels. The sensor in this detector operates on the
light scattering principle and features a unique photo-optic
sensing chamber that optimizes smoke entry while minimizing the effects of ambient light.
These detectors also provide restorable, 135°F fixed-temperature heat detection. The 2400AT heat detection unit is
integrated with the photoelectronic sensor while the
2400AIT’s heat detection unit is isolated from the photoelectronic smoke sensor and can be monitored separately.
In addition, a piezoelectric horn in each detector produces
D400-03-00 1 I56-287-02
an interrupted, 85 dBA tone when the individual detector
alarms or when the supply voltage polarity is reversed.
An LED on each detector lights to provide a local alarm indication and will remain on until the supply polarity is reversed. A screw terminal is provided for a remote LED
annunciator optional accessory (RA400Z). These detectors
also have the latching feature. The alarm can be reset only
by momentary power interruption.
Mounting
Each 2400 Series detector is supplied with a mounting
bracket kit to permit mounting in either of two ways:
1. Directly to a 3- or 4-inch octagonal, 11/2-inch deep electrical box (See Figures 1 and 2).
2. To a 4-inch square electrical box by using a plaster ring
with the mounting bracket kit supplied.
Spacing
NFPA 72E defines the spacing requirements for smoke detectors. Typically, this is 30 feet when the detectors are installed on a smooth ceiling. However, ALL installations
must comply with NFPA 72E and/or special requirements
of the authority having jurisdiction.
CAUTION
Figure 1. Flush mounting of detector on 4-inch
octagonal box:
Figure 2. Detector mounting bracket:
TAMPER
RESISTANT
TAB
A78-1394-00
Installation Wiring Guidelines
All wiring must comply with the National Electrical Code
and the applicable local codes, and any special requirements of the authority having jurisdiction, using the proper
wire gauges. 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), wiring no smaller than AWG 18 is recommended. The
clamping plates in the base can accept wire sizes up to
AWG 12. For best system performance, the power (+and –)
loop wires should be twisted pair and installed in separate
grounded conduit or shielded cable to protect the loop from
extraneous electrical interference. If a cable shield is provided, the shield connection to and from the detector must
be made continuous by using wire nuts, crimping, or soldering, as appropriate for a reliable connection.
Wire connections are made by stripping about 3/8” insulation from the end of the wire, sliding the bare end of the
wire under the clamping plate, and tightening the clamping
plate screw. Do NOT loop the wire under the terminals.
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. This chart contains a current list of UL-
TO MAKE DETECTOR TAMPER RESISTANT,
BREAK OFF TAB EXTENSION
AT SCRIBED LINE
A78-534-00
listed control units and detector combinations and is available from System Sensor upon request.
Dust covers provide limited protection against airborne
dust particles during shipping. Dust covers MUST be removed before the smoke detectors can sense smoke. Remove sensors before beginning remodeling or heavy
construction.
Tamper-resistance Feature
The Tamper Resistant Tab, in the detector mounting
bracket, can make the detector tamper-resistant by making
it necessary to use a pocket screwdriver, or similar tool, to
detach the detector from the bracket.
To make the detector tamper-resistant, use needle-nose pliers to break the smaller tab at the scribed line on the
Tamper Resistant Tab. Figure 2 shows the location of this
tab on the detector mounting bracket.
To remove a detector from the bracket after it has been
made tamper-resistant, use a pocket screwdriver, or other
similar tool, to depress the Tamper Resistant Tab, in the slot
on the mounting bracket, and rotate the detector counterclockwise.
Testing
NOTE: Before testing, notify the proper authorities that the
smoke detector system is undergoing maintenance
and, therefore, the system will be temporarily out
of service. Disable the zone or system undergoing
maintenance to prevent unwanted alarms.
Figure 3. Wiring diagram for 2400AT detector with two-wire control panel:
D400-03-00 2 I56-287-02
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