System Sensor 2412 Installation And Maintenance Instructions

INSTALLATION AND MAINTENANCE INSTRUCTIONS
2412, 2412TH, 2424, and 2424TH
Direct Wire Photoelectronic

Smoke Detectors

Specifications
Diameter:
Height:
Weight:
Operating Temperature Range:
Operating Humidity Range:
Maximum Air Velocity:
Latching Alarm:

Electrical Ratings

System Voltage:
Supply Voltage:
Reset Voltage:
Standby Current:
Alarm Currents:
The alarm and auxiliary relay operate within the specified voltage ratings.
Start-up Time:
EOL Relay:
Reset Time:
Relay Contacts – resistive or inductive (60% power factor) load:
Form A:
Form C:*
(*For Canadian installations, relay contact rating is 2.0A @ 30VAC/DC)

Before Installing

Please thoroughly read the System Sensor manual I56-407-
XX, Guide for Proper Use of System Smoke Detectors, which
provides detailed information on detector spacing, place-
ment, zoning, wiring, and special applications. Copies of
this manual are available at no charge from System Sensor.
(For installation in Canada, refer to CAN/ULC-S524,
Standard for the Installation of Fire Alarm Systems and CEC
Part 1, Sec. 32.)

General Description

System Sensor 2412 and 2424 photoelectronic smoke detec-
tors utilize state-of-the-art, optical sensing chambers. These
detectors are designed to provide open area protection, and
to be used with compatible UL-listed 4-wire control panels
only. The 2412 applies to 12 volt panels and operates at
12VDC, and the 2424 applies to 24 volt panels and operates
at 24VDC. Operation and sensitivity can be tested in place.
Models 2412TH and 2424TH have the same specifications as
models 2412 and 2424, but in addition feature a built-in
fixed temperature (135°F) thermal detection unit.
D400-06-00
5.5 inches (14 cm)
3.19 inches (81 mm); Add 0.5 inches (1.3 cm) for thermal units
0.7 lb (310 g)
2412 and 2424 — 0° to +49°C (32° to 120°F)
2412TH and 2424TH — 0° to +38°C (32° to 100°F)
10% to 93% Relative Humidity
3000 Ft./Min. (15 M/S)
Reset by momentary power interruption.
2412 2424
12 24
11.3 20
17 29
.73 .8
120 120
35 21.3
77 40.6
34 34
A77-716 A77-716
0.3 0.3
2.0A @ 30VAC/DC
0.6A @ 110VDC; 2.0A @ 30VDC
1.0A @ 125VAC; 2.0A @ 30VAC
DC (4V Maximum Ripple)
VDC Minimum
VDC Maximum
VDC Minimum
µA Maximum
mA Minimum
mA Maximum
S Maximum
An LED on each detector lights to provide a local alarm indi-
cation. It flashes every ten seconds indicating that power is
applied to the detector. The LED lights continuously in
alarm. These detectors also have the latching alarm feature
that resets only by a momentary power interruption.
Each detector contains one set of Form A contacts for con-
nection to the alarm-initiating circuit, and one set of Form C
auxiliary contacts. Supervision of detector power is accom-
plished by installing a Power Supervisory End-of-Line Relay
Module (A77-716 Series) at the end of the detector power
loop. When power is applied to and through the detectors,
the EOL Power Supervisory Module is energized. Its relay
contacts close and provide a closed series circuit in the con-
trol panel's alarm-initiating loop. A power failure or a break
in the detector power loop de-energizes the EOL Module.
The relay contacts open and trigger a trouble signal at the
control panel.
1
3825 Ohio Avenue
St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
I56-286-04R