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1. DESCRIPTION 

All Unite smoke detectors are approved to the most recent and rigorous stand-
ards. The photoelectric smoke detectors with their unique X-Profile sensing 
chamber are approved to EN14604: 2005 and are particularly sensitive to 
slow smouldering fires typically originating in living rooms, bedrooms and 
hallways whilst being highly resistant to nuisance alarms. 

The alarms are guaranteed for 6 years. However, their lives can be significant-
ly reduced by adverse environments, incorrect location and a failure to regu-
larly clean and maintain them according to the following instructions. Incorrect 
location and a lack of reasonable care may also cause them to malfunction 
and will invalidate the warranty.

Product Features

•   All models are supplied with a back-up power source. The 7885653316 

has a longlife lithium battery and the 7885653303 has 3 x AAA replace-
able alkaline batteries.

•   Alarm Silence – Silence your smoke alarm by momentarily pressing the 

test button. Ideal in non-emergency situations when nuisance alarms may 
have been created, for example, by steam. The red light flashes every 8 
seconds to remind you that the smoke alarm has been silenced and will 
automatically reset to quiescent mode in 10 minutes.

•  Bespoke software maximizes detection ability and false alarm rejection.

•   Power automatically switched on as detector is installed onto its mounting 

plate and automatically switched off when detector is removed.

•   A permanent green LED indicates mains power is connected and switched 

on.

•   Red LED flashes approximately every minute confirming unit is receiving 

power and ready to detect fire conditions. (Quiescent Mode)

•  Low Battery Warning alarm gives one acoustic alarm every minute.

•   Low Battery Warning Silence – Low battery warnings often start at night. 

Silence the audible warning for ten hours by pressing the test button, thus 
avoiding removing the alarm from its mounting plate and turning it off. The 
batteries on non-rechargeable battery alarms can then be replaced when 
convenient the following day.

•   Extra Large Test Button for ease of use, tests sensitivity, circuitry, power 

supply and alarm sounder.

•   Loud 85 Decibel Piezo Electric alarm automatically resets when hazardous 

condition has passed and chamber is clear.

•  Easy Installation – fixing screws and plugs supplied.

•   The built in interconnect facility allows the connection of a combination 

of up to 15 smoke detectors together so that when one alarm sounds all 
connected alarms will sound.

2. CHOICE AND LOCATION

Optical Smoke detectors are best at detecting smouldering fires such as those 
started in electrical equipment, clothing and soft furnishings such as seating, 
bedding, curtains and carpets. They are, therefore, ideally suited for living 
rooms, bedrooms and escape routes in domestic accommodation.

For minimum protection, install at least one smoke alarm on each level of your 
home. They should be installed in hallways, corridors and all escape routes 
from the building and within 3 meters of all bedroom doors. All alarms should 
be interconnected.

Recommended siting of smoke detectors in:

Single storey 
home with one 
sleeping area

Single storey 
home with two 
sleeping areas

Multiple storey 
home with multiple  
sleeping areas

DAGLIGSTUE

KØKKEN

KÆLDER

GARAGE

SOVEVÆRELSE

SOVEVÆR.

SOVEVÆR.

  Smoke detectors for minimum protection

DAGLIGSTUE

KØKKEN

KÆLDER

GARAGE

SOVEVÆRELSE

SOVEVÆR.

SOVEVÆR.

  Smoke detectors for minimum protection

Recommended position of smoke detectors in a room, corridor or 
escape route: 

ABOVE HEIGHT OF DOORS, 

WINDOWS AND VENTS

300mm MIN.

300mm MIN.

150mm MIN.

Recommended position of smoke detectors on apex ceilings:

600mm

MINIMUM

3. AVOID THE FOLLOWING LOCATIONS

The life of this smoke detector can be significantly reduced by adverse envi-
ronments, incorrect location and a failure to regularly clean and maintain it in 
accordance with the instructions below. Incorrect location and a lack of rea-
sonable care may also cause it to malfunction and will invalidate the warranty.

1.   Do not locate near fans or extractors. These can pull smoke and heat away 

from the smoke detectors.

2.   Do not install smoke detectors in or near high humidity areas such as 

showers, bathrooms or kitchens where humidity levels exceed 85% or the 
room temperature exceeds 40°C or falls below 0°C. These conditions may 
cause nuisance alarms and damage.

3.   Do not install in the peak of an “A” frame or sloping ceiling. This may delay 

smoke and heat reaching them due to the presence of dead air.

4.   Do not install less than 300mm from walls and light fittings when mounted 

on the ceiling where heat and dead air may prevent smoke reaching the 
alarm.

5.  Do not install smoke detectors in insect infested areas.

6.   Do not install smoke detectors in areas subjected to heavy concentra-

tions of cigarette smoke that will cause nuisance alarms and the smoke 
detector to become contaminated.

7.   Do not install smoke detectors in boiler rooms and garages where fumes 

and dust may cause nuisance alarms.

8.   Do not install near objects that could prevent smoke and heat reaching 

the alarm.

9.   Do not install close to fluorescent light fittings that could trigger nuisance 

alarms.

10. Do not paint the alarm.

The location of the alarms must be in accordance with applicable building 
regulations.

4. FURTHER DETAIL ON SMOKE DETECTOR

1.   At least one smoke detector should be installed in the escape route from 

all floors of the building.

2.   The detection element of smoke detectors should be between 25mm and 

600mm below the ceiling, or in the case of heat alarms between 25mm 
and 150mm

3.   Smoke and heat alarms should be at least 300mm from any wall or light 

fitting.

4.   If ceiling mounting is impractical smoke detectors may be installed on 

walls provided that the area is no longer or wider than 10 meters and 
the total area does not exceed 50 square meters and that: -

 

a.   The smoke detector is between 150mm and 300mm below the 

ceiling.

 

b.   The bottom of the smoke detector is above openings such as vents, 

doors and opening windows

 

c.   They are not mounted close to or above heaters or air-conditioning 

vents.

5.   Where smoke detectors are located in a hallway, corridor or landing, 

the smoke detectors should be no further than three meters from any 
bedroom door to assist audibility behind closed doors.

6.   For maximum protection no point should be further than 7.5 meters from 

any smoke detector

7.   To give the earliest warning of a developing fire, smoke detectors should 

be installed in all the rooms of your home and interlinked. (other than 
those in section 3, AVOID THE FOLLOWING LOCATIONS).

5. INSTALLATION PROCEDURE

IMPORTANT NOTE:

 Mains powered smoke detectors should be installed 

by a qualified electrician and in accordance of the Building Regulations. 

WARNING: 

Storing or installing smoke detectors in temperatures below 

5°C and above 30°C, and in low humidity may cause acustic signals and 
nuisance alarms when first installed. These will clear after a short time when 
the smoke detector has become acclimatised. Extended periods under these 
conditions will reduce the life of the alarms and invalidate the warranty. 
Do not expose to dripping or splashing. Disconnect the alarm before 
dismantling. Interconnect terminals and circuits are not to be accessible and 
must only ever run to other Interconnect terminals. Do not interconnect to 
alarms with other brand-names or made by other manufacturers.

The power supply should be from one of two sources:

a.   An independent circuit at the dwellings main distribution board with no 

other electrical equipment connected (other than a dedicated supply 
failure monitoring device) or:

b.   A separately electrically protected and regularly used local lighting 

circuit. Only suitably approved cabling should be used. The alarms 
should be wired using a minimum of 1,5mm2 “3 core and earth” cable; 
with the Brown to Live (L), Grey to neutral (N) and the Black to Interlink 
(I). All alarm circuits should be protected by an over-current device. The 
maximum total length of wiring should not exceed 250m. 

DINING

ROOM

LIVING ROOM

KITCHEN

BEDROOM

DINING

ROOM

LIVING ROOM

KITCHEN

BEDROOM

BEDROOM

DINING

ROOM

LIVING ROOM

KITCHEN

BEDROOM

DINING

ROOM

LIVING ROOM

KITCHEN

BEDROOM

BEDROOM

LIVING ROOM

KITCHEN

BASEMENT

GARAGE

BED ROOM

BED ROOM

BED ROOM

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