How the Smoke Alarm Works
As shown in the illustration, a light source is directed across the
smoke chamber and is not normally reflected into the sensing
element. When smoke enters the chamber, the light beam is
scattered by the smoke and is reflected into the sensor. When
enough light is detected by the sensor, an alarm is activated. On
alarm, the Sounder is activated and the red indicator light will flash.
When the smoke clears from the smoke chamber, the unit will
automatically reset itself.
Alarm Indications
Condition
Sounder
Indicator
RF
Light
Transmission
No Smoke
Silent
Flash every
Supervision
40-50 s
transmissionh
every 12 min.
Smoke
Alarm
Flash every
Alarm
0.67 s
transmission
Automatic Self Test
Silent
Flash every
Supervision
Functioning Normally
40-50 s
transmission
every 12 min.
Automatic Self Test
Chirp between
Flash every
Fire Trouble
Insufficient Sensitivity
LED flashes
40-50 s
transmission
Push-button Test
Alarm
Flash every
Supervision
Functioning Normally
0.67 s
transmission
every 12 min.
Push-button Test
Silent
Flash every
Fire Trouble
Insufficient Sensitivity
40-50 s
transmission
Magnet-Reed-Switch
Alarm
Flash every
Alarm
Test Functioning Normally
0.67 s
transmission
Magnet-Reed-Switch
Silent
Flash every
Fire Trouble
Test Insufficient Sensitivity
40-50 s
transmission
Low Battery
Chirp simultaneous
Flash every
Fire Trouble
with LED flash
40-50 s
transmission
Limitations of Smoke Alarms
While the Meridian Smoke Alarm has been designed for reliability,
it is important to know that all smoke alarms have limitations.
• Smoke alarms will not work without power. If the batteries are low,
the smoke alarm will not function. See “
Battery Installation” below
for important information on battery use.
• Smoke alarms can only generate an alarm when smoke gets
inside the Smoke Chamber; anything that prevents smoke from
entering the Smoke Chamber may prevent or delay an alarm.
Refer to the Guidelines for Locating Smoke Alarms on this
Instruction Sheet; it is important that smoke alarms be located on
at least every floor of the premises, preferably in every room. It is
also important to avoid obstructions, such as closed doors, that
may prevent smoke from reaching the unit. A smoke alarm will not
detect a fire in the walls, in the chimney or on the roof of a building
until smoke enters the Smoke Chamber.
• Smoke alarms have certain obvious limitations: they may not provide
protection for someone smoking in bed, for children playing with
matches, or for sudden and violent explosions. A smoke alarm is a
single part of overall fire safety precautions; the smoke alarm should
never be seen as a substitute for a complete fire safety program.
READ THIS INSTRUCTION SHEET THOROUGHLY BEFORE
INSTALLING AND USING YOUR MERIDIAN SMOKE ALARM
Features
• Advanced 90° photoelectric detection pattern and specially
designed smoke chamber
∗∗∗∗∗
for superior detection and dust
resistance
• Unique high signal-to-noise ratio and superior RFI
immunity to prevent false alarms
• Excellent smoke access provides reliable detection for all
smoke flow directions and velocities
• Loud 85dB piezoelectric alarm horn
• Battery-powered design for easy installation and
independence from house power sources
• Uses six AA batteries and special circuit design to provide
extra long battery life
• Solid-state LED indicator light (red)
• Visible flash light and audible trouble chirp for low battery
warning
• Equipped with an RF transmitter, WLS906 can
communicate with DSC's WLS900 Wireless and Power832
Security Systems
• Test Button allows user to perform sensitivity test and get
a local indication of test result
• Magnet-activated reed-switch allows user to perform
system test
• Battery removal sensor alerts user to missing battery and
prevents installation of alarm when no battery is installed
• Automatic self-test once every 40 seconds provides an
audible trouble indication if the unit has insufficient smoke
sensitivity
• Attractive styling for any decor
• ULC listed S531
∗∗∗∗∗
Protected under Canadian Patent No. 1452296. Other patents pending.
Introduction
The DSC Meridian Photoelectric Smoke Alarm incorporates many
advanced design features to provide years of reliable operation. It
is important to follow the Installation and Operation instructions on
this sheet to ensure that the unit will function properly - even the best
designed smoke alarm will be rendered useless if it is not connected
or located properly.
It is very important that you understand how to test and maintain
your system. Read the Instruction or User Manual for your alarm
system to familiarise yourself with the Fire Alarm functions. Be sure
to test your system regularly following the test procedures described
in your manual. If you should ever have problems operating or
testing your system, and especially if there are problems with the
Fire Alarm functions, contact your Smoke Alarm Installer or Dealer
immediately for service.
While smoke alarms and alarm systems are designed to warn you
of potentially dangerous situations, no system can prevent
emergencies. An alarm system is not a substitute for life and
property insurance; you should always maintain appropriate
insurance coverage.
WLS906
Battery-Powered Smoke Alarms
INSTRUCTIONS FOR
INSTALLATION AND USE
