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• Install the air inlet grille for air circulation. The correct
temperature can not be detected.
Unit
Duct
(Field supply)
Outlet Grille
(Field supply)
Inlet Grille
(Field supply)
(Room)
• Be sure to install the air filter in the air inlet. If the air filter
is not installed, the heat exchanger may be clogged and
its performance may decrease.
4. PIPE INSTALLATION
]
CAUTION
• Be more careful that foreign matter (oil, water, etc.) does
not enter the piping than with refrigerant R410A models.
Also, when storing the piping, securely seal the openings
by pinching, taping, etc.
• While welding the pipes, be sure to blow dry nitrogen gas
through them.
]1
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.
Thicknesses of Annealed Copper Pipes (R410A)
Pipe outside diameter [mm (in.)]
Thickness [mm]
6.35 (1/4)
0.80
9.52 (3/8)
0.80
12.70 (1/2)
0.80
15.88 (5/8)
1.00
19.05 (3/4)
1.20
3.3.2. Leveling
Use the procedure in the following figure to adjust the
levelness.
A
B
(Front)
Level meter
B
A
Level meter
(Side)
The side A of the unit with the drain port should be slightly
lower than the opposite side B of the unit. The height
difference between sides A and B should be from 0 to 20 mm.
3.3.3. Mounting the duct
Follow the procedure in the following figure to install the ducts.
862 mm
Intake port flange
851 mm
14 mm
324 mm
∗
14 mm
∗
Spacing between flange and drain pan.
Outlet port flange
26 mm
295 mm
∗
27 mm
CAUTION
• 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.
• The static pressure outside the unit is as follows.
ARXC36L Model: 100-200 Pa
ARXC45/60L Models: 100-250 Pa
• If an intake duct is installed, take care not to damage the
temperature sensor (the temperature sensor is attached
to the intake port flange).
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