LEGRAND 643087 Installation Instructions Download Page 4

Recommended Locations of Alarms:

 General requirements for Australia are in National Construction Code.

  There maybe additional requirements in your area. Please check for any 

special requirements in your area with the relevant regulators. 

  Install at least one alarm for each separate bedroom. Try to cover the exit 

path as the bedrooms are usually farthest from an exit. If there is more than 

one sleeping area, install additional alarms in each sleeping area in the 

immediate vicinity of bedrooms.

  Install at least one alarm to protect any stairway as stairways act like 

chimneys for smoke and heat.

  Install at least one alarm on every floor level.

  Install an alarm in every room where a smoker sleeps as additional protection.

  Install an alarm in every room where electrical appliances are operated (i.e. 

portable heaters or humidifiers) as additional protection.

  Install an alarm in every room where someone sleeps with the door closed 

as additional protection. The closed door may prevent the alarm from waking 

the sleeper.

  Smoke, heat and other combustion products rise to the ceiling and spread 

horizontally. Mounting the alarm on the ceiling in the centre of the room 

places it closest to all points in the room. Ceiling mounting is preferred in 

ordinary residential construction.

     

  When mounting an alarm on the ceiling install it at a minimum of 300mm 

from the side wall.

  When mounting an alarm at the apex of a sloping ceiling it should be located 

a minimum of 500mm from the apex but should not exceed 1500mm 

(see diagram).

I

A

N

I

A

N

E/LOOP

I

A

N

E/LOOP

40mm

10mm

TYPICAL MULTIPLE

FLOOR INSTALLATION

SINGLE FLOOR

BEDROOM

BEDROOM

BEDROOM

W/C

KITCHEN

DINING

BATH

BD/RM HALL

BD/RM

KITCHEN

RUMPUS

LOUNGE

ROOM

LOUNGE ROOM

Recommended locations

CEILING / WALL JUNCTION

CEILING

NEVER HERE

BEST

HERE

NEVER

HERE

HEAT &

SMOKE

FROM

FIRE

DEAD AIR

SPACE

SIDE WALL

300mm min 

300mm mi

n

APEX OF

SLOPING

CEILING

HEAT & SMOKE

FROM FIRE

DEAD 

AIR SPACE

1500mm max

500mm mi

n

500m

min

BEST

HERE

BEST

HERE

Mobile Home Installation:

  Modern mobile homes have been designed and insulated to be energy 

efficient. Install smoke alarms as recommended (refer to RECOMMENDED 

LOCATIONS).

  In mobile homes that are not well insulated extreme heat or cold can be 

transferred from the outside through poorly insulated walls and roof. This 

may create a thermal barrier that can prevent smoke from reaching a smoke 

alarm mounted on the ceiling. In such units, install the smoke alarm on 

inside partition between 300mm and 600mm from the ceiling.

   If you are not sure about the insulation in your mobile home, or if you notice 

the walls and ceilings are either hot or cold, install alarm on an inside wall. 

For minimum protection, install one alarm in each bedroom.

We recommend that the smoke alarm be tested after each journey.

Operation, Testing and Maintenance:

OPERATION

The smoke alarm is operational once all wires are properly connected, the 

smoke alarm is correctly installed on the mounting base, and the alarm has 

been tested. There are two LED indicators. Each of them has a unique function:

Red LED

  

Stand-by condition:

 will flash once approximately every 60 seconds to 

indicate unit is functioning properly.

  

Alarm condition:

 will flash quickly when unit goes into alarm. The flashing 

red LED and pulsating alarm will continue until the air is cleared. For 

interconnected units, the originating smoke alarm red LED will be flashing. 

All other units will sound but not flash.

Green LED

  

AC Mains-ON Indicator:

 indicates that the unit is operating with AC power. If 

this LED goes out, it indicates that the AC power is off.

False Alarm Hush Control Feature:

  This smoke alarm has the capability of being temporarily desensitised for 

approximately 10 minutes.

  If the smoke alarm is sounding it can be desensitised by pressing the “HUSH/

TEST” button on the smoke alarm cover.

  After pressing the “HUSH/TEST” button, the alarm will silence immediately 

and red LED will flash every 15 seconds for approximately 10 minutes to 

indicate the alarm is in the temporary desensitised condition.

  The smoke alarm will automatically reactivate after approximately 10 minutes 

and sound the alarm if particles of combustion are still present.

  The “HUSH” feature may be used repeatedly until the air has cleared.

TESTING

NOTE: Before testing, make sure that the smoke alarm is connected to AC 

power supply (make sure the green LED is ON).

  Test alarm by pushing and holding the test “HUSH/TEST” button for 5  

seconds. This should sound the alarm if all electronic circuitry and horn are 

working.

  If no alarm sounds, check - wiring, fuses or circuit breaker and make certain 

that alarm is connected to a continuous final sub-circuit.

  With interconnected units, holding test button down on one unit will cause all 

connected units to sound.

  Continuous chirping or erratic noise or low sound from an alarm may 

indicate a defective alarm.

  If none of the above, return the unit to place of purchase.

Smoke alarm should be tested on a monthly basis. To accurately test the 

integrity of the sensing chamber use a smoke detector (aerosol) tester.

NOTE: 

After the above alarm test with the ‘HUSH/TEST’ button, the alarm will 

be desensitised for about 10 minutes. 

ONLY DO THE SMOKE AEROSOL TEST 

AFTER THIS DESENSITISED PERIOD.

WARNING: 

Do not apply excessive force on the “HUSH/TEST” button this may 

damage the smoke alarm and may void the warranty.

WARNING: 

Never use an open flame of any kind to test your alarm. You may 

damage the alarm or set fire to your home. The built-in test switch enables 

testing of all electronic components and the horn.

MAINTENANCE

The smoke alarm is virtually maintenance free. However, under dusty or greasy 

conditions, a vacuum cleaner may be used to clean the exterior of unit (including 

slots on cover). We recommend using a vacuum cleaner to clean the exterior of 

the unit every six months. 

DO NOT IMMERSE IN OR SPRAY WITH HOUSEHOLD 

CLEANERS. If the unit gives a chirping sound every 60 seconds, the Electronic 

Unit must be replaced.

Repairs and Services:

   If the smoke alarm is defective in any way, do not tamper with the unit. See 

warranty section for details. 

Note: NO USER REPLACEABLE PARTS INSIDE.

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