ENGLISH
TECHNICAL DATA
Battery 3V built-in lithium battery
Battery time Up to 10 years
Power consumption < 20 mA on alarm
Radio frequency 433.92 MHz
Range up to 50 m
Max ERP 10 mW
Alarm signal 85 dB (A) at 3 metres
Operating temperature
0°C – 40°C
Ambient humidity 10 – 90% RH
Interconnection Radio – max 12 units
Compatible models GNSP-2236/RF2, MTS-166/RF2,
MTS-163/RF2
Sensitivity, smoke 0.65 – 1.52% per 0.3 m obscuration
This instruction folder contains important information
on correct installation and maintenance of your smoke
alarm. Read through the whole folder before installing
it, and keep the folder for future reference.
The Nexa MSA-866/RF2 is designed to detect smoke
particles and give an early warning if a fire should start
(assuming correct placing and maintenance).
CHARACTERISTICS
• Optical sensor to detect smouldering res
• LED indication for Alarm and Voltage
• Test button for operation and alarm
• Silent Function / Pause Button
• Warning for low battery level
• Wireless connection by radio link
• 85 dB alarm signal
• Dust cover included
IMPORTANT
• The radio range may vary depending on the location, the
design of the building and the materials used in the building.
• Do not remove or disconnect the batteries to stop false
alarms as this will disable the vital function of the smoke
alarm. Open windows or ventilate the air around the smoke
alarm in order to stop it, and/or press the pause button.
• The smoke alarm is intended for use for use in single-
family homes. In multiple-occupancy buildings, each
home must be equipped with its own smoke alarms.
• This smoke alarm is not suitable for use in buildings that
are not used for residential purposes. The smoke alarm
is no substitute for a full alarm system that is required
by law or by the fire authorities.
• The smoke alarm detects combustion particles in the air
(smoke). It does not react to flames or gas.
• The smoke alarm is designed to emit an alarm signal if a
fire is developing.
• The smoke alarm should be tested every week and
replaced every ten years.
POSITIONING THE SMOKE ALARM
For the smoke alarm to provide an early warning, it has to
be installed in the location where the re starts. Therefore,
Nexa recommends that you install smoke alarms in each
room and on all oors.
Single-level home: To achieve minimum protection,
position the alarm in the entrance hall between the living
areas (including the kitchen) and the sleeping areas.
Position it as close as possible to the living areas, and
make sure the alarm can be heard by anyone in the
bedrooms. See Figure 1, for example:
Multi-storey home: To achieve minimum protection,
position and alarm in the stairwell (at ground level) and
another alarm above the landing on the top oor, as well
as an alarm on the ceiling in the basement at the foot of
the stairs. This covers the basement level, but not crawl
spaces and unfurnished attics.
See the example in Figure 2.
Ceiling installation
Hot smoke rises and spreads, so installing your smoke alarm
in a central location on the ceiling is recommended. Avoid
areas where air does not circulate, e.g. corners. Also keep
it away from objects that may prevent the free ow of air.
Position the device at least 30 cm from light ttings or interior
ttings that may prevent smoke/heat reaching the detector.
Position it at least 1 metre away from the wall. See Figure 3A.
Wall mounting, if ceiling mounting is not possible
Avoid installing the device a long way into a corner.
Position the upper edge of the smoke alarm at least 15
cm and no more than 30 cm away from the ceiling. See
Figure 3A.
Sloping ceilings
In the case of sloping surfaces or ceilings that move up
towards a ridge, the detector must be installed 90 cm from
the highest point, measured horizontally, because still air
under the ridge may prevent smoke reaching the device.
See Figure 3B.
Note: There must be an alarm in every room (except the
kitchen, bathroom and garage) to provide recommended/
maximum protection. DO NOT POSITION AN ALARM IN
THE KITCHEN or BATHROOM as cooking smells or steam
may activate the alarm. DO NOT POSITION AN ALARM
IN THE GARAGE as there is a risk of it being triggered by
exhaust fumes.
HALL-
WAY
BASEMENT
LIVING ROOM
BATHROOM
KITCHEN
BEDROOM
BEDROOM
BEDROOM
BEDROOM
HALLWAY
Maximum /
recommended
protection
Minimum
protection
BATHROOM
BEDROOM
LIVING
ROOM
LANDING
KITCHEN
CEILING
WALL
BEST IN THE
MIDDLE OF THE ROOM
Min. 1 m
Min.
15 cm
Max.
30 cm
90 cm
FIGURE 1. Single-level home
FIGURE 3A FIGURE 3B
FIGURE 2. Multi-storey home
LOCATION ON CEILING AND WALL
OPTICAL SMOKE ALARM
with built-in battery and wireless
self-learning interconnection
Model: MSA-866/RF2
INSTALLATION
1. Test and programme the smoke alarm – see the
sections TESTING and PROGRAMMING.
2. Install the mounting plate in a selected location on the
ceiling. Take care when positioning your smoke alarm.
3. Place the smoke alarm on the mounting plate and rotate
the smoke alarm clockwise until it clicks into place.
4. Press the test button to check that smoke alarm is
working correctly.
TESTING
• Test your alarms both before and after installation so
as to be sure that they are working.
• Only test your alarms using the test button. Never use
a naked ame as this may destroy the smoke alarm.
• Get into the habit of testing your smoke alarms once
a week.
TESTING THE SMOKE ALARM
• PRESS and hold down the test button for 3 seconds,
release
• The smoke alarm emits an alarm signal and the red
LED ashes rapidly.
PROGRAMMING
MSA-866/RF2 is equipped with transmitters and
receivers allowing them to communicate wirelessly
with each another and with MTS-166/RF2, MTS-163/
RF2 and GNSP-2236/RF2 devices. For this to work, the
smoke alarms must be linked together through simple
programming.
Select one of the alarms to be your master device and
mark it with an M on the back so you can recognise it
later on. When programming, the master device transmits
a radio code to the other alarms so they link together.
•
•
Fit the smoke alarm’s mounting plate temporarily and
turn it counterclockwise to activate the battery in the
smoke alarms that are to be linked.
Hold down the test button on the master device for 11
seconds, the LED indicator shines steadily. The
master device is now in programming mode for about
30 seconds before returning to normal mode.
• Press and hold the test button in for 2 seconds on
the slave unit, when the LED indicator ashes red
twice, the connection is completed.