LEGRAND 643087 Installation Instructions Download Page 3

PROFESSIONAL PHOTOELECTRIC SMOKE ALARM

INSTALLATION INSTRUCTIONS

Installation:

n

     

Terminals at back of mounting base are marked as follows: 

A - Active         I - Interconnect         N - Neutral         E/Loop - Earth or Loop

EXAMPLE OF MULTIPLE ALARM WIRING:

When interconnected, all smoke alarms will sound upon activation. However, 

only the originating smoke alarm will have flashing Red LED.

WARNING: 

Connecting the Interconnect terminal to any supply conductor will 

result in damage to the alarm, failure to operate or shock hazard and will void 

the warranty of the alarm.

WARNING:

 Under no circumstances must an insulation resistance test be 

carried out on a circuit to which a smoke alarm is connected.
The test could cause irreparable damage to the internal circuitry of the smoke 

alarm and make it inoperative.
The warranty would be void under such circumstances.

WARNING:

 Clipping the Electronic Unit in the base will activate the battery. 

The battery has been designed to have a lifespan of 10 years in normal 

working condition.

Plastic Bag:

1.    

The smoke alarm is supplied in a plastic bag to protect the electronic unit 

from dust during the building construction phase.

2.  

Legrand recommendation is to place the electronic unit (in the plastic bag) 

aside until commissioning of the building. This will protect the electronic 

unit from dust.

3.

  On commissioning, discard the plastic bag and clip the electronic unit into 

the mounting base assembly.

4.

  Once removed, keep the plastic bag away from babies and children to 

avoid danger of suffocation. 

Mounting Instructions:

BEFORE mounting the smoke alarm, please read the following carefully.
This smoke alarm is made up of 2 sub-assemblies – the mounting base 

assembly & the electronic unit.

Legrand recommendation is to place the electronic unit (in the plastic bag) aside 

until commissioning of the building.

The electronic unit should only be removed from the plastic bag at the end of the 

building construction phase, when the smoke alarm is to be commissioned. The 

building construction phase includes sanding, painting preparation, painting, 

flooring etc.

1.  

Select a suitable location on the ceiling for the smoke alarm.

2.  

Cut a Ø90mm hole in the ceiling.

3.  

Strip the Active, Neutral & Interconnect (if used) wires back according to the 

strip length shown in figure 1.

4.

  Unscrew the terminal cover to access the terminals.

5.

  Connect the wires to the correct terminals on the mounting base as shown in 

figure 1. Ensure the screws are fully tightened.

6.  

Break out tabs on terminal cover to suit cable. Screw the terminal cover back 

onto the mounting base to prevent accidental contact with live terminals.

7. Insert the mounting base into the hole. Tighten the 2 screws to clamp the 

mounting base onto the ceiling. Refer to figure 2. 

8. Do not remove the electronic unit from the plastic bag.

Mounting Instructions:

Toggle position indicates unit is not 

clamped onto ceiling. In this position, 

the Electronic Unit cannot be fitted.

Toggle position indicates unit 

is clamped onto ceiling.

Tighten 2 screws to clamp Mounting Base onto ceiling

Commissioning:

1.  

Remove the electronic unit from the plastic bag.

2.

  Remove the spacer from the electronic unit.

3.

  Insert the electronic unit into the mounting base as shown in figure 3. Push 

the electronic unit firmly until it latches (clicks) onto the mounting base.

4.

  Turn on mains power and check the green and red LED function. The green 

LED should glow to show main power present. The red LED will pulse every 

60 seconds (approximate) to indicate correct operation.

5. Press the Test/Hush button for 5 seconds to check that the alarm works.

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

ACCEPTABLE HERE

BEST
HERE

NEVER
HERE

HEAT &
SMOKE

FROM

FIRE

DEAD AIR

SPACE

SIDE WALL

300mm min 

300mm mi

n

 600mm max

APEX OF
SLOPING
CEILING

HEAT & SMOKE

FROM FIRE

DEAD 

AIR SPACE

1500mm max

500mm mi

n

500m

min

BEST
HERE

BEST
HERE

Figure 1

Figure 2

Figure 3

Align the 

groove of the 

electronic unit 

to the rib of 

the mounting 

base

Align the 

groove of the 

electronic unit 

to the rib of 

the mounting 

base

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