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For RIGHT REAR or LEFT REAR piping
(The following figure is a front view of the indoor unit installation location.)
59
For LEFT REAR
piping
For RIGHT or LEFT piping
For LEFT
piping
54
For RIGHT BOTTOM or LEFT BOTTOM piping
For LEFT
BOTTOM
piping
182
29
Attach the wall pipe
Fasten with vinyl
tape
WARNING
If the wall pipe is not used, the ca-
ble interconnecting the indoor and
outdoor units may touch metal
and cause electric leakage.
Wall cap*
3.6. Indoor unit installation
• Use the included and
fasten the indoor unit
at 4 locations (→)
each at top and the
middle of the unit.
• When the unit is set
to the wall, use the
wall hook bracket
and hook the top of
the indoor unit on the
indoor unit wall hook
bracket.
• Install it so that there
is no gap between
the indoor unit and
the wall.
Fix the indoor unit with 4 screws surely. If improperly installed, might cause to injury due
to the toppling or falling.
Install the indoor unit at the place that has adequate strength. Install the indoor unit so
that the installed unit can withstand the weight of adult body weight.
If improperly installed, might cause accidental injury due to the toppling or falling.
Unit: mm
59
For RIGHT
REAR piping
Unit: mm
For RIGHT
piping
54
Unit: mm
For RIGHT
BOTTOM
piping
64
29
5 to 10 mm
low
Wall pipe*
* Locally
purchased
(Inside)
Wall
(Outside)
703
WARNING
3.7. Installing the wall hook bracket
(1) Install the wall hook bracket so that it is correctly positioned horizontally and vertical-
ly. If the wall hook bracket is tilted, water will drip to the floor.
(2) Install the wall hook bracket so that it is strong enough to support the weight of the
unit.
• Fasten the wall hook bracket to the wall with 5 or
more screws through the holes near the outer edge
of the bracket.
• Check that there is no rattle at the wall hook
bracket.
Weight
Install the wall hook bracket level, both horizontally and vertically.
4. PIPE INSTALLATION
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.
4.1. Selecting the pipe material
Do not use existing pipes from another refrigeration system or refrigerant.
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 (es-
pecially 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 (R22) 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 avail-
able on the market.
Thicknesses of
Annealed Copper
Pipes (R410A)
4.2. Pipe requirement
Refer to the installation manual for the outdoor unit for description of allowable pipe
length and height difference.
Unit: mm
Use pipe with water-resistant heat insulation.
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 to 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).
Hook the indoor unit to the
wall hook bracket (2 positions)
Leveling
method
CAUTION
CAUTION
CAUTION
Pipe outside diameter [mm (in)]
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
CAUTION
CAUTION
Thickness [mm]
0.80
0.80
0.80
1.00
1.20
En-4
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