System Sensor 2312/24TB Installation And Maintenance Instructions

INSTALLATION AND MAINTENANCE INSTRUCTIONS
Before installing detectors, please thoroughly read System Sensor Manual I56-407-XX, 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.

GENERAL DESCRIPTION:

Model 2312/24TB is a 4-wire combination smoke/heat detector. In addition to photoelectronic smoke detection, two supervised elec-
tronic thermistors provide restorable 135°F fixed temperature heat detection. The installation is simplified by the use of an adaptor
bracket and a plug-in screw terminal block which can be pre-wired to the system allowing the detector to be easily installed or removed
for cleaning. It is designed to provide open area protection, and to be used with UL listed 4-wire control panels. The detector's sen-
sitivity can be tested in place using the MOD400R field sensitivity test module.
The 2312/24TB is listed to UL 268 and is a latching type system detector. When latched in alarm, the detector must be reset by a
momentary power interruption.
An LED on the detector provides a local indication of the detector's status. If power is applied to the detector, and the detector is
functioning properly in standby, the status LED will blink every 10 seconds. The detector performs a self-test on its smoke sensing
chamber and internal electronics every 40 seconds. If this test fails, the detector stops blinking the status LED in standby, and the
LED will remain off. In alarm, the LED will be latched on continuously until the detector is reset.

SPECIFICATIONS:

Diameter:
Height:
Weight:
Operating Temperature Range:
Operating Humidity Range:
Latching Alarm:
Test Feature:
Maximum Air Velocity:
Sensitivity:
Heat Sensor:

ELECTRICAL RATINGS:

System Voltage nominal:
minimum:
maximum:
Maximum Ripple Voltage:
Standby Current:
Alarm Current:
Reset Voltage:
Reset Time:
Start-up Time:
EOL relay:
ALARM INITIATION CONTACT RATINGS:
Resistive or inductive load (60% power factor):
Form A: 2.0A @ 30 VAC/DC
D300-05-00
System Sensor, 3825 Ohio Avenue, St. Charles, Illinois 60174, 1-800-SENSOR2, FAX: 708-377-6495
FOR MODEL 2312/24TB
5.5 inches (14 cm)
2.5 inches (6.4 cm)
0.7 lb (310 gm)
0° to +38° C (32° to 100° F)
10% to 90% Relative Humidity Non-condensing
Reset by momentary power interruption.
Recessed test switch.
3000 Ft./Min. (15 Meters/Sec.).
Nominal 3%/Ft.
135°F Fixed Temperature Electronic Thermistor
12 or 24 VDC
8.5 VDC
35 VDC
30% of nom. Voltage (peak to peak)
120 µA max.
10mA minimum. 50mA maximum.
0.8 VDC minimum
6 Sec. maximum
34 Sec. maximum
(After 60 Sec. Reset)
A77-716B, 12/24 Volt
Figure 1. 2312/24TB Smoke/Heat Detector
S0175-00
I56-431-06