AirStage AUUB18TLAV Kurulum Kılavuzu - Sayfa 6

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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)

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 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)).

En-5

CAUTION

Thickness [in. (mm)]

0.032 (0.80)

0.039 (1.00)

0.047 (1.20)

CAUTION

4.3. Flare connection (pipe connection)

Tighten the ﬂ are nuts with a torque wrench using the speciﬁ ed tightening method.

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

leak and generate 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 (or

RB unit) 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, clutch

[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 flaring 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

Pipe outside diameter

ﬂ ats

[in. (mm)]

1/4 (6.35)

3/8 (9.52)

1/2 (12.70)

5/8 (15.88)

3/4 (19.05)

4.3.2. Bending pipes

• If pipes are shaped by hand, be careful not to collapse them.

• Do not bend the pipes in an angle more than 90°.

• When pipes are repeatedly bend or stretched, the material will harden, making it

difﬁ cult to bend or stretch them any more.

• Do not bend or stretch the pipes more than 3 times.

To prevent breaking of the pipe, avoid sharp bends.

If the pipe is bent repeatedly at the same place, it will break.

WARNING

Check if [L] is ﬂ ared uniformly and

is not cracked or scratched.

Dimension B

[in. (mm)]

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)

Width across flats of

Flare nut [in. (mm)]

11/16 (17)

7/8 (22)

1 (26)

1-1/8 (29)

1-7/16 (36)

CAUTION

0 (0)

-0.015 (-0.4)