Conventional Products—6424 Projected Beam Type Smoke Detector 3
Introduction
This document contains important information about installing and
operating 6424 long distance projected beam type smoke detectors. These
conventional detectors are manufactured by System Sensor for use with
Johnson Controls systems. If you install this detector for someone else to
use, you must leave a copy of this document with the user.
These instructions provide information regarding placement, mounting,
wiring, installation, alignment, sensitivity, sensitivity testing, and
maintenance. Follow only those instructions that apply to the model you
are installing.
Before you install any 6424 long distance projected beam type smoke
detectors, read and be familiar with:
●
System Sensor Guide for Proper Use of System Smoke Detectors
Technical Bulletin in the Fire Initiating Devices and Notification
Appliances Technical Manual (FAN 408) that provides detailed
information on detector spacing, placement, zoning, wiring, and
special applications
●
or, for non-United States installations, applicable codes and standards
specific to country and locality of installation
Failure to follow these directions may result in failure of this device to
report an alarm or trouble condition or respond properly to an alarm
condition. Johnson Controls is not responsible for devices that have been
improperly installed, tested, or maintained by others.
The 6424 is a long range projected beam smoke detector designed to
provide open area protection. It is to be used with UL Listed, separately
supplied power (4-wire) control panels only. The detector consists of a
separate transmitter and receiver. Smoke entering the area between the
transmitter and receiver causes an obscuration in signal at the receiver.
When the obscuration reaches one of two predetermined thresholds
(chosen with a switch in the receiver), the detector generates an alarm
signal. Complete blockage of the beam causes a trouble signal to avoid
false alarms. Slow changes in obscuration due to a build up of dirt or dust
on the lens of the detector are compensated for by a microcontroller,
which continuously monitors the signal strength and periodically updates
the alarm and trouble thresholds. When the self-compensation circuit
reaches its limit, the detector generates a trouble signal, indicating the
need for service.
General
Description
