En-4
Mounting the duct
21 21
4
1
Follow the procedure in the following figure to install the ducts.
351
19
14
30
304
49
1260
1062
106
152
921
Inlet port flange
*Spacing between flange and safety drain pan.
Outlet port flange
Unit : 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.
Set the external static pressure between 60 and 260Pa and set the appropriate static
pressure mode. (Refer to 8.3 Function setting)
If an intake duct is installed, take care not to damage the temperature sensor (the
temperature sensor is attached to the intake port flange).
Install the air inlet grille for air circulation. The correct temperature can not be
detected.
Unit
Outlet Grille
(Field supply)
Inlet Grille
(Field supply)
(Room)
Duct
(Field supply)
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.
PIPE INSTALLATION
4
1
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.
Selecting the pipe material
4
1
1
1
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.
Pipe outside diameter [mm (in.)]
Thickness [mm]
6.35 (1/4)
0.8
9.52 (3/8)
0.8
12.70 (1/2)
0.8
15.88 (5/8)
1.0
19.05 (3/4)
1.2
Pipe requirement
4
1 21
CAUTION
Refer to the Installation Manual of the outdoor unit for description of the length of
connecting pipe or for difference of its elevation.
Diameter [mm (in.)]
Liquid
9.52 (3/8)
Gas
15.88 (5/8)
Use pipe with water-resistant heat insulation.
•
CAUTION
Install heat insulation around both the gas and liquid pipes. Failure to do so may
cause water leaks.
Use heat insulation with heat resistance above 120 °C. (Reverse cycle model only)
In addition, if the humidity level at the installation location of the refrigerant piping is
expected to exceed 70 %, install heat insulation around the refrigerant piping.
If the expected humidity level is 70-80 %, use heat insulation that is 15 mm or thicker
and if the expected humidity exceeds 80 %, use heat insulation that is 20 mm or
thicker. If heat insulation is used that is not as thick as specified, condensation may
form on the surface of the insulation.
In addition, use heat insulation with heat conductivity of 0.045 W/(m·K) or less (at 20 °C).
Flare connection (pipe connection)
4
1 21
Flaring
4
1 21
1
1
Use special pipe cutter and flare tool exclusive for R410A.
•
Cut the connection pipe to the necessary length with a pipe cutter.
(1)
Hold the pipe downward so that cuttings will not enter the pipe and remove any burrs.
(
2
)
Insert the flare nut (always use the flare nut attached to the indoor and outdoor units
(3)
respectively) onto the pipe and perform the flare processing with a flare tool. Use the
special R410A flare tool, or the conventional flare tool. Leakage of refrigerant may
result if other flare nuts are used.
Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from
(4)
entering the pipes.
Check if [L] is flared uniformly
and is not cracked or scratched.
Pipe
Die
B
L
A
Pipe outside
diameter
[mm (in.)]
Dimension A [mm]
Dimension B
-
0
0.4
[mm]
F
lare tool for R410A,
clutch type
6.35 (1/4)
0 to 0.5
9.1
9.52 (3/8)
13.2
12.70 (1/2)
16.6
15.88 (5/8)
19.7
19.05 (3/4)
24.0
When using conventional flare tools to flare R410A pipes, the dimension A should be
approximately 0.5 mm more than indicated in the table (for flaring with R410A flare tools) to
achieve the specified flaring. Use a thickness gauge to measure the dimension A.
Pipe outside
diameter [mm (in.)]
Width across flats
of Flare nut [mm]
6.35 (1/4)
17
9.52 (3/8)
22
12.70 (1/2)
26
15.88 (5/8)
29
19.05 (3/4)
36
Width across
flats
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