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READ THIS INSTRUCTION SHEET THOROUGHLY

BEFORE INSTALLING AND OPERATING YOUR

MERIDIAN SMOKE DETECTOR

Introduction

The DSC Meridian wireless photoelectric smoke detector
incorporates many advanced design and technical
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 — any smoke detector will be rendered
useless if it is not properly connected or located.
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 familiarize yourself with
the fire alarm functions. Be sure to test your system
regularly by 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, then contact your
smoke detector installer or dealer immediately for
service.
While smoke detectors 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.

How the Smoke Detector 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
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 LED will flash. 

When

the smoke clears from the smoke chamber, the unit
will automatically reset itself.

WLS906-433 EU

Wireless Smoke Detector
For Residential Use

INSTRUCTIONS FOR
INSTALLATION AND USE

Alarm Indications

Condition

Sounder

Indicator

RF

Light

Transmission

No smoke

Silent

Flash every

Supervision

40-50 s

transmission

every

12 minutes

Smoke

Alarm

Flash every

Alarm

0.67 s

transmission

Automatic self-test

Silent

Flash every

Supervision

functioning normally

40-50 s

transmission

every

12 minutes

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 minutes

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

40-50 s

transmission

sensitivity
Low battery

Chirp simultaneous Flash every

Fire Trouble

with LED flash

40-50 s

transmission

Limitations of Smoke Detectors

While the Meridian smoke detector has been designed
for reliability, it is important to know that all smoke
detectors have limitations.
• Smoke detectors will not work without power. If the

batteries are low, the smoke detector will not function.
See  ‘Battery Installation’ below for important
information on battery use.

• Smoke detectors can only generate an alarm when

smoke enters 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 Detectors’ on this 

Instruction Sheet.

It is important that smoke detectors be located on 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 detector will not detect a fire in the walls, in the
chimney or on the roof of a building. It will only detect
smoke when it enters the smoke chamber.

• Smoke detectors 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 detector is a
single part of overall fire safety precautions; the smoke
detector should never be seen as a substitute for a
complete fire safety program.

Mounting the Unit

Locate the smoke detector mounting plate on the wall or
ceiling and mark all desired screw locations*. Use the
supplied wall anchors for all screw locations. When the
anchors have been placed, secure the mounting plate
to the ceiling or wall.
To place the smoke detector on its mounting plate, align
the mounting plate's locking tab with the lock recess on
the case and turn the unit clockwise until it is firmly
secured. Insert the screw provided to secure the head
and mounting plate.

*Note: Select a smooth flat surface. If the mounting
surface is uneven, the unit may generate a tamper fault.

Dust Cover

The dust cover is intended to protect the unit from dust
and dirt entry, while the unit is not in service.

CAUTION: The smoke detector will not function with
the dust cover in place.

Installer’s Maintenance Instructions

Normally, the Meridian smoke detector will not require
maintenance. If the unit is mounted in a dusty environment,
the inlet areas of the case should be wiped gently with a
soft, dry cloth.

Be sure to inform the user and their monitoring station when
maintenance of any sort is performed on the smoke
detector or any part of the alarm control system. Always
test smoke detectors after maintenance. If a smoke detector
continues to generate nuisance alarms even after
maintenance, return the unit to your vendor for service.

Installer’s Responsibility to the User

It is the installer’s responsibility to thoroughly instruct
the user on the operation, testing, and maintenance of
their system. The installer should fully explain and
demonstrate all functions of the alarm control system
and any equipment, such as smoke detectors connected
to it. The user should be provided with all instruction
sheets and manuals for their system and any components
connected to it. Complete and thorough instruction for
the user is essential to ensure they will obtain the
greatest benefit from their system. Providing the user
with complete operational information will also benefit
the installer through a reduction in service calls for
nuisance alarms.

Limited Warranty

Digital Security Controls Ltd. warrants that for a period of twelve months from the date of

purchase, the product shall be free of defects in materials and workmanship under normal use

and that in fulfilment of any breach of such warranty, Digital Security Controls Ltd. shall, at

its option, repair or replace the defective equipment upon return of the equipment to its repair

depot. This warranty applies only to defects in parts and workmanship and not to damage

incurred in shipping or handling, or damage due to causes beyond the control of Digital

Security Controls Ltd. such as lightning, excessive voltage, mechanical shock, water damage,

or damage arising out of abuse, alteration or improper application of the equipment.
The foregoing warranty shall apply only to the original buyer, and is and shall be in lieu of any

and all other warranties, whether expressed or implied and of all other obligations or liabilities

on the part of Digital Security Controls Ltd.  Digital Security Controls Ltd. neither assumes,

nor authorizes any other person purporting to act on its behalf to modify or to change this

warranty, nor to assume for it any other warranty or liability concerning this product.
In no event shall Digital Security Controls Ltd. be liable for any direct, indirect or consequential

damages, loss of anticipated profits, loss of time or any other losses incurred by the buyer in

connection with the purchase, installation or operation or failure of this product.
Smoke detectors that are a part of this system may not properly alert occupants of a fire for

a number of reasons, some of which follow. The smoke detectors may have been improperly

installed or positioned. Smoke may not be able to reach the smoke detectors, such as when

the fire is in a chimney, walls or roofs, or on the other side of closed doors. Smoke detectors

may not detect smoke from fires on another level of the residence or building.
Every fire is different in the amount of smoke produced and the rate of burning. Smoke

detectors  cannot  sense  all  types  of  fires  equally  well.  Smoke  detectors  may  not  provide

timely warning of fires caused by carelessness or safety hazards such as smoking in bed,

violent  explosions,  escaping  gas,  improper  storage  of  flammable  materials,  overloaded

electrical circuits, children playing with matches or arson.
Even if the smoke detector operates as intended, there may be circumstances when there

is insufficient warning to allow all occupants to escape in time to avoid injury or death.

Warning: Digital Security Controls Ltd. recommends that the entire system be completely tested

on a regular basis. However, despite frequent testing, and due to, but not limited to, criminal

tampering or electrical disruption, it is possible for this product to fail to perform as expected.
Important Information: Changes or modifications not expressly approved by Digital

Security Controls Ltd. could void the user’s authority to operate this equipment.

© 2001 Digital Security Controls Ltd., Toronto, Canada

www.dsc.com  •  

Printed in Canada    29005729 R003

EN54-7

Compliant

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