AirStage AUXK018GLAH Manuale di installazione - Pagina 5

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Washer

(Accessories)

Washer

(Accessories)

10 to 15 mm

3.3.4 Leveling

• Using a level, or vinyl hose filled with water, fine adjust so that the body is level.

• Inclined installation so as the drain pipe side is higher may cause a malfunction of the

float switch, and may cause water leakage.

Vinyl hoses

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 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)

Pipe outside diameter [mm (in)]

6.35 (1/4)

9.52 (3/8)

12.70 (1/2)

15.88 (5/8)

19.05 (3/4)

4.2. Pipe requirement

Refer to the installation manual for the outdoor unit for description of allowable pipe

length and height difference.

Hanging bolt

(locally purchased)

Nut A

(locally purchased)

30 mm or more

After installing the body,

tighten the nuts.

Nut B (Double Nut)

(locally purchased)

Drain pipe

CAUTION

Thickness [mm]

0.80

1.00

1.20

CAUTION

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 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 15 mm or thicker and

if the expected humidity exceeds 80 %, use heat insulation that is 20 mm or thicker. If

heat insulation is used that is not as thick as specified, 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 20 °C).

4.3. Flare connection (pipe connection)

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

wise, 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.

Die

Pipe

Dimension A [mm]

Pipe outside diameter

Flare tool for R410A,

[mm (in)]

clutch type

6.35 (1/4)

9.52 (3/8)

12.70 (1/2)

15.88 (5/8)

19.05 (3/4)

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

be approximately 0.5 mm more than indicated in the table (for flaring with R410A flare

tools) to achieve the specified flaring. Use a thickness gauge to measure the dimension A.

It is recommended that a R410A flaring tool is used.

Width across flats Pipe outside diameter [mm (in)] Width across flats of Flare nut [mm]

6.35 (1/4)

9.52 (3/8)

12.70 (1/2)

15.88 (5/8)

19.05 (3/4)

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 difficult

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.

CAUTION

WARNING

Check if [L] is flared uniformly and

is not cracked or scratched.

Dimension B

-0.4

9.1

13.2

0 to 0.5

16.6

19.7

24.0

CAUTION

[mm]

En-4