background image

D400-08-00                REV#-002 

 

I56-007-000

1412A and 1424A Direct Wire 
Ionization Smoke Detectors

INSTALLATION AND MAINTENANCE INSTRUCTIONS

Before Installing 

Please  thoroughly  read  the  System  Sensor  manual  I56-

407-XX, 

Guide  for  Proper  Use  of  System  Smoke  Detec-

tors

,  which  provides  detailed  information  on  detector 

spacing,  placement,  zoning,  wiring,  and  special  appli-

cations. Copies of this manual are available at no charge 

from System Sensor. Please also refer to CAN/ULC-S524, 

Standard  for  the  Installation  of  Fire  Alarm  Systems

  and 

CEC Part , Sec. 32..

General Description

System Sensor 42A and 424A dual-chamber ionization 

smoke  detectors  utilize  state-of-the-art,  unipolar  sensing 

chambers. These detectors are designed to provide open 

area  protection,  and  to  be  used  with  ULC-listed  4-wire 

control  panels.  The  42A  for  2  volt  panels  operates 

at 2VDC, and the 424A for 24 volt panels operates at 

24VDC.  The  detectors’  operation  and  sensitivity  can  be 

tested in place. These detectors 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 

Specifications

Diameter: 

5.5 inches (4 cm)

Height: 

3.2 inches (8.0 cm)

Weight: 

0.7 lb (30 gm)

Operating Temperature: 

0° to +49°C (32° to 20°F)

Operating Humidity: 

0% to 93% Relative Humidity Non-condensing

Locking Alarm: 

Reset by momentary power interruption.

Relay Contact Ratings

Resistive or Inductive (60% power factor) load

Form A: 

2.0A @ 30VAC/DC

Form C: 

2.0A @ 30VAC/DC

Electrical Ratings: 

 

 

1412A   

 

1424A

System Voltage: 

24 

DC (4V Maximum Ripple)

Supply Voltages: 

.3 

20 

VDC Minimum

 

7.3 

29 

VDC Maximum

Reset Voltages: 

.73 

.8 

VDC Minimum

Standby Current: 

00 

00 

µ

A Maximum

Alarm Currents: 

35.2 

2.3 

mA Minimum

 

77.0 

40.6 

mA Maximum

The alarm and auxiliary relay operate within the specified voltage ratings.

Reset Time: 

0.3 

0.3 

Seconds

Start-up Time: 

30 

30 

Seconds

detector’s status. If power is applied to the detector, and 

the detector is functioning properly in standby, the status 

LED will blink every 0 seconds. In alarm, the LED will be 

latched on continuously until the detector is reset.

Each  detector  contains  one  Form  A  (SPST-NO)  contact 

for connection to the alarm-initiating circuit, and one Form 

C (SPDT-NO/NC) set of auxiliary contacts. Supervision of 

detector power is accomplished by installing a Power Su-

pervisory End-of-Line Relay Module (A77-76) 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 control 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.

658  Kitimat Rd., Unit #6, Mississauga, Ontario, L5N 3T5

-800-SENSOR2, FAX: 905-82-077

WWW.SYSTEMSENSOR.CA

Содержание 1412A

Страница 1: ...sing Locking Alarm Reset by momentary power interruption Relay Contact Ratings Resistive or Inductive 60 power factor load Form A 2 0A 30VAC DC Form C 2 0A 30VAC DC Electrical Ratings 1412A 1424A System Voltage 12 24 DC 4V Maximum Ripple Supply Voltages 11 3 20 VDC Minimum 17 3 29 VDC Maximum Reset Voltages 73 8 VDC Minimum Standby Current 100 100 µA Maximum Alarm Currents 35 2 21 3 mA Minimum 77 ...

Страница 2: ...g the wiring between interconnected de tectors it is recommended that the wire be no smaller than 18 gauge Wire sizes up to 12 gauge wire may be used For best system performance the power and loop wires should be twisted pair and installed in separate grounded conduit to protect the loop from extraneous elec trical interference Smoke detectors and alarm system control panels have specifications fo...

Страница 3: ...E Before testing notify the proper authorities that the smoke detector system is undergoing main tenance and therefore will temporarily be 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...

Страница 4: ...e 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 work manship u...

Отзывы: