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Fasten the unit securely with Special nuts A and B.

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 0.04 oz. /100 ft. (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 (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)

En-7

Prohibited

Unit: in. (mm)

Level

Prohibited

Unit: in. (mm)

CAUTION

Thickness [in. (mm)]

0.032 (0.80)

0.039 (1.00)

0.047 (1.20)

4.2. Pipe requirement

Refer to the Installation Manual of the outdoor unit for description of the length of

connecting pipe or for difference of its elevation.

• 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 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)

Tighten the flare nuts with a torque wrench using the specified tightening method.

Otherwise, the ﬂ are nuts could break after a prolonged period, causing refrigerant to

leak and generate a hazardous gas if the refrigerant comes into contact with a ﬂ ame.

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)]

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.

Pipe outside diameter

Width across

[in. (mm)]

ﬂ ats

1/4 (6.35)

3/8 (9.52)

1/2 (12.70)

5/8 (15.88)

3/4 (19.05)

CAUTION

WARNING

Check if [L] is ﬂ ared uniformly and

is not cracked or scratched.

Dimension B

[in. (mm)]

clutch type

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)

Width across flats

of Flare nut [in. (mm)]

21/32 (17)

7/8 (22)

1-1/32 (26)

1-5/32 (29)

1-13/32 (36)

0 (0)

-0.015 (-0.4)