AirStage ABUA24RLAV Manuel d'installation - Page 6

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B-3. Installing brackets

Install the bracket with nuts, spring washers.

Ceiling panel

Spring washer

(Field supply)

[If using anchor bolts]

Spring washer

(Field supply)

M10 Nut (Field supply)

B-4. Installing indoor unit

Reset the hex bolts as shown in the ﬁ gure

Indoor unit

Apply the indoor unit to the brackets.

Now, securely tighten the hex bolts in both sides.

3.3.3. Barrier and RFM base removal and installation

(1) Remove the barriers by removing the 4 ﬁ xing screws (2 screws each).

(2) Remove the RFM base by removing the 2 ﬁ xing screws and unhooking the 1 hook.

(3) After completing the work, install the barriers and RFM base as they were originally.

Fixing screw

(2 positions)

Barriers

Install the barriers in the correct direction.

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.

En-5

Bracket (Left)

Special nut

(Accessories)

Bracket

Bracket (Right)

M10 Nut (Field supply)

Bracket

Hex bolt

5/16 to 1/2 (8 to 13)

Unit: in. (mm)

Bracket

Bolt

Indoor unit

Hook

Fixing screw

RFM base

(2 positions)

CAUTION

] 1

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 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)

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

CAUTION

Thickness [in. (mm)]

0.032 (0.80)

0.039 (1.00)

0.047 (1.20)

CAUTION

Check if [L] is ﬂ ared uniformly

and is not cracked or scratched.