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5 Installation
2×
5.1.2
Guidelines when installing the ducting
WARNING
If one or more rooms are connected to the unit using a
duct system, make sure:
▪ there are no operating ignition sources (example: open
flames, an operating gas appliance or an operating
electric heater) in case the floor area is less than A
specified in the General safety precautions;
▪ no auxiliary devices, which may be a potential ignition
source, are installed in the duct work (example: hot
surfaces with a temperature exceeding 700°C and
electric switching device);
▪ only auxiliary devices approved by the manufacturer
are used in the duct work;
▪ an air inlet or outlet is connected directly with a room by
ducting. Do NOT use spaces such as a false ceiling as
a duct for the air inlet or outlet.
WARNING
Do NOT install operating ignition sources (example: open
flames, an operating gas appliance or an operating electric
heater) in the duct work.
CAUTION
▪ Make sure the installation of the duct does NOT exceed
the setting range of the external static pressure for the
unit. Refer to the technical datasheet of your model for
the setting range.
▪ Make sure to install the canvas duct so vibrations are
NOT transmitted to the duct or ceiling. Use a sound-
absorbing material (insulation material) for the lining of
the duct and apply vibration insulation rubber to the
hanging bolts.
▪ When welding, make sure NOT to spatter onto the
drain pan or the air filter.
▪ If the metal duct passes through a metal lath, wire lath
or metal plate of the wooden structure, separate the
duct and wall electrically.
▪ Install the outlet grille in a position where the airflow will
not come into direct contact with people.
▪ Do NOT use booster fans in the duct. Use the function
to adjust the fan rate setting automatically. For setting
refer to the installation manual of the used user
interface.
The ducting is to be field supplied.
▪ Air inlet side. Attach the duct and intake-side flange (field
supply). For connecting the flange, use 7 accessory screws.
Installation manual
8
a b
c
d
e
a
Connection screw (accessory)
b
Flange (field supply)
c
Main unit
d
Insulation (field supply)
e
Aluminium tape (field supply)
▪ Fixing screws. When installing an air inlet duct, select fixing
screws that stick out 5 mm on the inside of the flange to protect
the air filter from damage during maintenance of the filter.
a
b
c
5 mm
a
Air inlet duct
b
Inside of the flange
c
Fixing screw
▪ Filter. Be sure to attach an air filter inside the air passage on the
min
intake side. Use an air filter with dust collecting efficiency ≥50%
(gravimetric method). The included filter is not used when the
intake duct is attached.
▪ Air outlet side. Connect the duct according to the inside
dimension of the outlet-side flange.
▪ Air leaks. Wind aluminium tape around the intake side flange and
duct connection. Make sure there are no air leaks at any other
connection.
▪ Insulation. Insulate the duct to prevent condensation from
forming. Use glass wool or polyethylene foam 25 mm thick.
5.1.3
Guidelines when installing the drain
piping
Make sure condensation water can be evacuated properly. This
involves:
▪ General guidelines
▪ Connecting the drain piping to the indoor unit
▪ Checking for water leaks
General guidelines
▪ Pipe length. Keep drain piping as short as possible.
▪ Pipe size. Keep the pipe size equal to or greater than that of the
connecting pipe (vinyl pipe of 20 mm nominal diameter and
26 mm outer diameter).
▪ Slope. Make sure the drain piping slopes down (at least 1/100) to
prevent air from being trapped in the piping. Use hanging bars as
shown.
1~1.5 m
a
Hanging bar
O
Allowed
X
Not allowed
▪ Condensation. Take measures against condensation. Insulate
the complete drain piping in the building.
b
a
e
d
a
FNA25~60A2VEB(9)
Split system air conditioners
4P456958-1J – 2020.12
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