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[For (D) Left bottom piping, (E) Left piping and (F) Left rear piping]
Insert the drain hose and drain cap into the drain port, making sure that it comes in con-
tact with the back of the drain port, and then mount it. If the drain hose is not connected
properly, leaking will occur.
(1) Interchange the drain cap and the drain hose.
Indoor unit
drain hose
Drain hose removal and installation method
Removal
Screw
Drain hose
Vertically insert the
drain hose toward
the inside, so that
the drain fixture can
accurately align
with the screw hole
Drain fixture
around the drain
cock.
Remove the screw at the left
of drain hose and pull out drain
After inserting and before replacing, reinstall and fix the
removed screws.
hose.
Installing the drain cap
Use a hexagonal wrench 3/16 in (4 mm) at op-
No gap
posite side to insert the drain cap, till the drain cap
contacts the tip of drain cock.
Hexagonal
Drain cock
wrench
Drain cap
(2) Align the marks on the wall
Wall hook bracket
hook bracket and shape
the connection pipe.
For left piping and left rear
piping, align the marks on
the wall hook bracket and
shape the connection pipe.
(3) Bend the connection piping
at the bend radius of 2-3/4
in (70 mm) or more and
install no more than 1-3/8
Connection piping
in (35 mm) from the wall.
3.3.5 Installing the indoor unit
(1) After passing the indoor piping and drain hose through the wall hole, hang the indoor
unit on the hooks at the top and bottom of the wall hook bracket.
After hooking the indoor unit to the top hook, hook the fittings of the indoor unit to the
2 bottom hooks while lowering the unit and pushing it against the wall.
Indoor unit
(2) Insert the spacer, etc. between the indoor
unit and the wall hook bracket and separate
the bottom of the indoor unit from the wall.
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.
CAUTION
For left outlet piping, cut off the
piping outlet cutting groove with
a hacksaw.
Drain cap
Remove the drain cap by pulling at the projec-
tion at the end of the cap with pliers, etc.
Installation
Drain cock
Drain fixture
Screw hole
Drain hose
Alignment marks
Connection pipe (Gas pipe)
Connection pipe (Liquid pipe)
Wall hook bracket
Top hooks
Bottom hooks
Indoor unit
(Spacer)
Wall hook bracket
CAUTION
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 0.04 oz/100 ft (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)
Screw
Pipe outside diameter [in (mm)]
1/4 (6.35)
3/8 (9.52)
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
4.2. Pipe requirement
Refer to the installation manual for the outdoor unit for description of allowable pipe
length and height difference.
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 248 °F (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 9/16 in (15 mm) or
thicker and if the expected humidity exceeds 80 %, use heat insulation that is 13/16 in
(20 mm) or thicker. If heat insulation is used that is not as thick as specified, condensa-
tion 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 68 °F (20 °C))
4.3. Flare connection (pipe connection)
Tighten the flare nuts with a torque wrench using the specified tightening method. Oth-
erwise, the flare nuts could break after a prolonged period, causing refrigerant to leak
and generate hazardous gas if the refrigerant comes into contact with a flame.
4.3.1 Flaring
Use special flare tool exclusive for R410A.
(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that cuttings will not enter the pipe and remove any burrs.
(3) Insert the flare nut (always use the flare nut attached to the indoor and outdoor units
(or RB unit) respectively) onto the pipe and perform the flare processing with a flare
tool. Use the special R410A flare tool. Leakage of refrigerant may result if other flare
nuts are used.
(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from
entering the pipes.
Check if [L] is flared uniformly
and is not cracked or scratched.
Pipe outside diameter
[in (mm)]
1/4 (6.35)
3/8 (9.52)
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
CAUTION
Thickness [in (mm)]
0.032 (0.80)
0.032 (0.80)
0.032 (0.80)
0.039 (1.00)
0.039 (1.20)
CAUTION
CAUTION
WARNING
Die
Pipe
Dimension A [in (mm)]
Dimension B
Flare tool for R410A,
[in (mm)]
clutch type
3/8 (9.1)
1/2 (13.2)
0 to 0.020
5/8 (16.6)
(0 to 0.5)
3/4 (19.7)
15/16 (24.0)
0 (0)
-0.015 (-0.4)
En-4
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