AirStage ARXB24GALH Installation Manual - Page 6

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To prevent people from touching the parts inside the unit, be sure to install grilles on

the inlet and outlet ports. The grilles must be designed in such a way that cannot be

removed without tools.

The static pressure outside the unit is as follows.

ARXA24/30/36/45L Model: 30-150 Pa

ARXB24/30/36/45L Models: 0-80 Pa

If an intake duct is installed, take care not to damage the temperature sensor (the

temperature sensor is attached to the intake port ﬂ ange).

Install the air inlet grille for air circulation. The correct temperature can not be detected.

Outlet Grille

(Field supply)

(Room)

Be sure to install the air ﬁ lter in the air inlet. If the air ﬁ lter is not installed, the heat

exchanger may be clogged and its performance may decrease.

3.3.5. Fresh air intake

(Processing before use)

(1) When taking in fresh air, cut a slit shaped cabinet in the left side of the outer case

with nippers.

Cut

Cabinet (Iron plate)

When removing the cabinet (iron plate), be careful not to damage the indoor unit

internal parts and surrounding area (outer case).

When processing the cabinet (iron plate), be careful not to injure yourself with burrs,

etc.

(2) Install the round ﬂ ange (optional parts) to the fresh air intake.

(3) Connect the duct to the round ﬂ ange.

(4) Seal with a band and vinyl tape, etc. so that air does not leak from the connection.

Duct

En-5

CAUTION

Unit

Duct

(Field supply)

Inlet Grille

(Field supply)

Round hole

CAUTION

Round duct

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

(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.1

•

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 [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 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 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 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 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 hazardous gas if the refrigerant comes into contact with a ﬂ ame.

CAUTION

Thickness [mm]

0.80

1.00

1.20

CAUTION

WARNING