AirStage ASUA12RLAV 설치 매뉴얼 - 페이지 6

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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.

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 70-80 %, 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 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

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.

En-5

CAUTION

Thickness [in. (mm)]

0.032 (0.80)

0.039 (1.00)

0.047 (1.20)

CAUTION

WARNING

Die

Pipe

Pipe outside diameter

[in. (mm)]

Flare tool for R410A,

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

Width across

diameter [in. (mm)]

ﬂ ats

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.

4.3.3. Pipe connection

Be sure to install the pipe against the port on the indoor unit correctly. If the centering

is improper, the ﬂ are nut cannot tighten smoothly. If the ﬂ are nut is forced to turn, the

threads will be damaged.

Do not remove the ﬂ are nut from the indoor unit pipe until immediately before connecting

the connection pipe.

Hold the torque wrench at its grip, keeping it at a right angle with the pipe, in order to

tighten the ﬂ are nut correctly.

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.

When the ﬂ are nut is tightened properly by your hand, hold the body side coupling with

a separate wrench, then tighten with a torque wrench.

Torque wrench

Indoor unit pipe

(Body side)

Flare nut [in. (mm)]

1/4 (6.35) dia.

3/8 (9.52) dia.

1/2 (12.70) dia.

5/8 (15.88) dia.

3/4 (19.05) dia.

Check if [L] is ﬂ ared uniformly and

is not cracked or scratched.

Dimension A

[in. (mm)]

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)

CAUTION

Tighten with 2 wrenches.

Holding wrench

Flare nut

Connection pipe

Tightening torque [lbf·ft. (N·m)]

11.8 to 13.3 (16 to 18)

23.6 to 31.0 (32 to 42)

36.1 to 45.0 (49 to 61)

46.5 to 55.3 (63 to 75)

66.4 to 81.1 (90 to 110)

0 (0)

-0.015 (-0.4)