ENGLISH
TECHNICAL DATA
MTS-166/9V
Battery 9V zinc carbon
Battery time Up to 3 years
MTS-166/10Y
Battery 9V lithium
Battery time Up to 10 years
MTS-166/9V and MTS-166/10Y
Alarm signal 85 dB (A) at 3 metres
Operating temperature 0°C – 40°C
Ambient humidity 10 – 90% RH
Sensitivity, smoke 0.08 – 0.18 db/m
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.
Nexa's MTS-166 smoke alarm 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
• Silent Function / Pause Button
• Warning for low battery level
• Complete with plugs and screws
• 85 dB alarm signal
• Dust cover included
IMPORTANT
• Do not remove or disconnect the battery to stop false
alarms. 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.
• 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
CEILING
WALL
BEST IN THE
MIDDLE OF THE ROOM
Min. 1 m
Min.
15 cm
Max.
30 cm
BATHROOM
BEDROOM
LIVING
ROOM
LANDING
KITCHEN
HALL-
WAY
BASEMENT
LIVING ROOM
BATHROOM
KITCHEN
BEDROOM
BEDROOM
BEDROOM
BEDROOM
HALLWAY
Maximum /
recommended
protection
Minimum
protection
CEILING
WALL
BEST IN THE
MIDDLE OF THE ROOM
Min. 1 m
Min.
15 cm
Max.
30 cm
90 cm
LIVING
ROOM
LANDING
KITCHEN
FIGURE 1. Single-level home
FIGURE 3A FIGURE 3B
FIGURE 2. Multi-storey home
LOCATION ON CEILING AND WALL
OPTICAL SMOKE ALARM
Model: MTS-166/9V and MTS-166/10Y
INSTALLATION
1. Remove the mounting plate on the back of the smoke
alarm by rotating the mounting plate counterclockwise.
2. Insert the battery. Make sure you are using the correct
polarity (+/-).
3. Test the smoke alarm, see the TESTING section
4. Install the mounting plate in a selected location on the
ceiling. Take care when positioning your smoke alarm.
5. Place the smoke alarm on the mounting plate and rotate
the smoke alarm clockwise until it clicks into place.
6. 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,
and then release it
• The smoke alarm emits an alarm signal and the red
LED ashes rapidly.
• Red LED indication ashes to conrm deletion.
OPERATION
• Red LED ashes once a minute, indicating that the
battery is charged and status is OK.
• On alarm, the device emits a loud pulsating signal and
the red LED ashes rapidly.
• On low battery level, the smoke alarm emits a short
signal once a minute.
PAUSE FUNCTION
The smoke alarm has a combined button for the test and
pause functions. You can use the pause function to stop
the alarm signal if the alarm is triggered due to a false
alarm. You activate the pause function is activated by
holding down the test/pause button for 3 seconds while
the device is emitting an alarm.
The alarm will stop for 10 minutes and, during the period,
the red LED ashes every 10 seconds. The smoke
alarm is reset to normal sensitivity after the end of the
10-minute pause period.
If necessary, press the pause button again to pause the
alarm again.
SILENT FUNCTION
Silence function means when the alarm is low battery or
fault alarm, end-user can silence the alarm for 10 hours
by pressing the test button for 2-3 seconds. So, if this
happens at night, the end-user can silence the alarm and
wait until morning to change the battery.