Ariston NIMBUS PLUS M NET Manual page 64

INSTALLATION GUIDE
Warning
The appliance must be installed by a qualified techni-
cian in possession of the skills required by law.
Before installing the appliance
• The outdoor unit uses an ecological refrigerant liquid
(type HFC R-410A) that does not affect the integrity of
the ozone layer. Refrigerant R-410A operates at a pres-
sure 50-70% higher than refrigerant R22. Make sure
that all the materials used for maintenance and to fill the
components can be used with refrigerant R-410A.
• The bottles containing refrigerant R-410A are equipped
with a dip tube which allows the liquid to flow only when
placed in a vertical position with the valve in the upper
position.
• The appliance should be filled with the indicated refrige-
rant R-410A. Apply a dispenser, available on the market,
on the pipe sleeve, in order to vaporize the refrigerant
before it flows in the external unit.
• The refrigerant R-410A, as all HFC fluids, is only com-
patible with the oils recommended by the compressor
manufacture.
• The vacuum pump is not sufficient to completely elimi-
nate the presence of humidity in the oil.
• POE type oils quickly absorb humidity. Do not expose oil
to air.
• Never open the appliance when it is in vacuum condi-
tions.
• Do not throw the refrigerant R-410A in the environment.
• Ensure that, during the installation of the external unit,
all national regulations in terms of safety are observed.
• Make sure that the appliance is connected properly
to the ground. Check that the voltage and frequency
of power supply match those necessary to the external
unit and that the installed capacity is sufficient to allow
the functioning of the appliance itself.
• Check that the impedance of the supply net corres-
ponds to the power input from the external unit as
shown on the data plate of this unit (EN 61000-3-12).
• Check that safety switches are correctly sized and
connected to the external unit.
Choice of placement
• Avoid a mounting where the ODU is surrounded by wal-
ls
• Avoid a mounting in sinks. Cold air sinks down and by
that air short circuit could occur.
• Avoid positioning the external unit in places which are
difficult to access for the subsequent installation and
maintenance.
• Avoid placing it near sources of heat.
• Avoid placing it in places where the external unit is sub-
jected to continuous vibration.
64 / GB
• Do not place the external unit on structures that do not
guarantee support.
• Avoid placing it in close proximity to fuel tanks of gas.
• Avoid a positioning that provides exposure to oil vapors.
• Avoid a positioning characterized by particular environ-
mental conditions.
• Choose a location where noise and air discharged from
the outdoor unit will not disturb the neighbors.
• Choose a position sheltered from the wind.
• Provide a placement that allows the compliance to the
required installation distances.
• Avoid placing it in a location that prevents access to
ports and / or passageways.
• The structure of the soil surface should be able to sup-
port the weight of the external unit and reduce as much
as possible vibrations.
• If the external unit is installed in a location where there
are abundant snowfall, install the unit at least 200 mm
above the usual level of fallen snow or use a support
bracket.
• External unit must be installed on antivibration support.
• In case of installation of the unit in places with strong
winds, the use of windbreaker barriers is recommended
Minimum distances to installation (mm)
150
300
WARNING:
Define where the units will be located taking into account
the minimum installation clearances in mm shown here
above.
Note: The distances indicated here above are the mini-
mum for a good unit operation. To avoid abnormal noise,
echoes and resonances increase this distances especially
on the front side of the units. The height of the obstacles
at both front and side should be lower than the height of
the outdoor unit.
150
1000