En-4
3.3.3. Intake duct connection
Follow the procedure in the following
fi
gure to the ducts.
Unit : mm
The air inlet duct can be changed by replacing the intake grille and
fl
ange.
For the bottom air intake, follow the procedure of
1
→
2
for installation.
(The factory setting is back air intake.)
1
2
CAUTION
When air is taken in from the bottom side, the operating sound of the product will easily
enter the room. Install the product and intake grilles where the affect of the operating
sound is small.
CAUTION
If an intake duct is installed, take care not to damage the temperature sensor.
Be sure to install the air inlet grille and the air outlet grille for air circulation. The correct
temperature cannot be detected.
Unit
Air Outlet Grille
Air Inlet Grille
(Room)
When connecting the duct, perform duct-insulation that is appropriate for the installing
environment.
Inappropriate insulation work may cause condensation on the surface of the insulating
material, and may lead condensation drip.
Grills must be
fi
xed so that man cannot touch indoor unit fan, and cannot be removed
by only hand operation without tool.
Be sure to install the air
fi
lter in the air inlet. If the air
fi
lter is not installed, the heat
exchanger may be clogged and its performance may decrease.
3.3.4. Outlet duct connection
Duct installation pattern (
CUT PART)
Square duct
(1)
(2) Round duct outlet ×4
(This is the factory setting.)
When using as a square duct
(1) Cut the slit seam
with a cutter.
Turn up the insulation around the points to be cut according to the outlet port shape
(2)
working points so that the insulation does not stick out at the
part.
Cut
Cut
Cut
Cut
Cut with nippers and remove the sheet metal.
(3)
Since there is a slit in the insulation, use radio pliers, tweezers, etc. to stretch the
(4)
screw hole part used when installing the round
fl
ange and square
fl
ange when con-
necting the duct.
CAUTION
Check that duct work does not exceed the range of external static pressure of
equipment.
Make sure to insulate ducts to avoid the dew condensation.
Make sure to insulate between ducts and walls if metal ducts are used.
Please explain handling and washing methods of locally purchased materials to the
customer.
To prevent people from touching the parts inside the unit, be sure to install grilles on
the inlet and outlet ports. The grilles must be designed in such a way that cannot be
removed without tools.
When connecting the duct to the outlet port of the indoor unit, be sure to insulate the
outlet port and the installation screws to prevent water from leaking around the port.
4.
PIPE INSTALLATION
CAUTION
Be careful that foreign matter (oil, water, etc.) does not enter the piping with refrigerant
R410A models. Also, when storing the piping, securely seal the openings by pinching,
taping, etc.
While brazing the pipes, be sure to purge with dry nitrogen gas.
4.1. Selecting the pipe material
CAUTION
Do not use existing pipes.
Use pipes that have clean external and internal sides without any contamination which
may cause trouble during use, such as sulfur, oxide, dust, cutting waste, oil, or water.
It is necessary to use seamless copper pipes.
Material : Phosphor deoxidized seamless copper pipes
It is desirable that the amount of residual oil is less than 40 mg/10 m.
Do not use copper pipes that have a collapsed, deformed, or discolored portion
(especially on the interior surface). Otherwise, the expansion valve or capillary tube
may become blocked with contaminants.
Improper pipe selection will degrade performance. As an air conditioner using R410A
incurs pressure higher than when using conventional refrigerant, it is necessary to
choose adequate materials.
•
Thicknesses of copper pipes used with R410A are as shown in the table.
•
Never use copper pipes thinner than those indicated in the table even if they are
available on the market.
9379127035-02_IM.indb Sec1:4
9379127035-02_IM.indb Sec1:4
23/01/2013 16:25:41
23/01/2013 16:25:41
