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3.3.3. Attach the drain hose

Insert the drain hose and drain cap into the drain port, making sure that it comes

in contact with the back of the drain port, and then mount it. If the drain hose is not

connected properly, leaking will occur.

• Wrap the insulation around the drain hose, making sure that there are no gaps.

• Attach the Insulation (Drain hose) to the drain hose.

Drain hose

[For 1 Rear piping, 2 Right piping and 3 Bottom piping]

• The drain hose and drain cap are used as they are.

[For 4 Left bottom piping, 5 Left piping and 6 Center piping,

7 Left rear piping]

• Remove the drain cap and drain hose. Mount the drain cap and drain hose to the drain

port on its opposite side.

Right side

Drain cap

Insert the drain cap until it butts

against the drain port.

3.3.4. Cut-out for piping on front cover

[For 2 Right piping, 3 Bottom piping, 4 Left bottom piping and

5 Left piping]

• Use a metal shears or other cutting tool to cut along the groove in the plastic for the

piping that will coming out of the front cover.

For 3 Bottom piping

For 2 Right piping

4. PIPE INSTALLATION

]

Be more careful that foreign matter (oil, water, etc.) does not enter the piping when

installing 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

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).

CAUTION

Insulation (Drain hose)

(Accessories)

Left side

Drain hose

Drain cap

Drain hose

Insert the drain hose until it butts

against the drain port.

For 5 Left piping

For 4 Left bottom piping

CAUTION

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 (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

available on the market.

Thicknesses of Annealed Copper Pipes (R410A)

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 70-80 %, use heat insulation that is 19/32 in.

(15 mm) or thicker and if the expected humidity exceeds 80 %, use heat insulation

that is 25/32 in. (20 mm) or thicker. If heat insulation is used that is not as thick as

speciﬁ ed, 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 68 °F (20 °C)).

4.3. Flare connection (pipe connection)

4.3.1. Flaring

Use special ﬂ are 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 ﬂ are nut (always use the ﬂ are nut attached to the indoor and outdoor units

respectively) onto the pipe and perform the ﬂ are processing with a ﬂ are tool. Use

the special R410A ﬂ are tool. Leakage of refrigerant may result if other ﬂ are nuts are

used.

(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from

entering the pipes.

Die

Pipe

Dimension A [in. (mm)]

Pipe outside diameter

Flare tool for R410A,

[in. (mm)]

clutch type

1/4 (6.35)

3/8 (9.52)

1/2 (12.70)

5/8 (15.88)

3/4 (19.05)

When using conventional (R22) ﬂ are tools to ﬂ are R410A pipes, the dimension A should

be approximately 0.020 in. (0.5 mm) more than indicated in the table (for ﬂ aring with

R410A ﬂ are tools) to achieve the speciﬁ ed ﬂ aring. Use a thickness gauge to measure the

dimension A. It is recommended that a R410A ﬂ aring tool is used.

Width across

diameter [in. (mm)]

ﬂ ats

Thickness [in. (mm)]

0.032 (0.80)

0.039 (1.00)

0.047 (1.20)

CAUTION

Check if [L] is ﬂ ared uniformly and

is not cracked or scratched.

Dimension B

[in. (mm)]

11/32 (9.1)

17/32 (13.2)

0 to 0.020

21/32 (16.6)

(0 to 0.5)

25/32 (19.7)

15/16 (24.0)

Pipe outside

Width across flats

of Flare nut [in. (mm)]

1/4 (6.35)

21/32 (17)

3/8 (9.52)

7/8 (22)

1/2 (12.70)

1-1/32 (26)

5/8 (15.88)

1-5/32 (29)

3/4 (19.05)

1-13/32 (36)

0 (0)

-0.015 (-0.4)

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