AirStage ARXB14GALH Installation Manual - Page 8

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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 a 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

Pipe outside

diameter [mm (in.)]

Flare tool for R410A, 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) ﬂ are tools to ﬂ are R410A pipes, the dimension A should

be approximately 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.

Width across

Pipe outside diameter

ﬂ ats

En-7

CAUTION

WARNING

Check if [L] is ﬂ ared uniformly and

is not cracked or scratched.

Dimension A [mm]

Dimension B

0 to 0.5

Width across ﬂ ats of Flare nut

[mm (in.)]

[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

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 flare 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.

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

a separate spanner, then tighten with a torque wrench. (See the table below for the ﬂ are

nut tightening torques.)

Indoor unit pipe

(Body side)

Flare nut [mm (in.)]

Route the pipe as shown in the illustration below.

[mm]

0.4

• CEILING CONCEALED TYPE

9.1

13.2

16.6

19.7

24.0

• FLOOR STANDING CONCEALED TYPE

Connect the piping so that the control box cover can easily be removed for servicing

when necessary.

In order to prevent water from leaking into the control box, make sure that the piping is

well insulated.

CAUTION

Torque wrench

Connection pipe

Tightening torque [N·m (kgf·cm)]

6.35 (1/4) dia.

9.52 (3/8) dia.

12.70 (1/2) dia.

15.88 (5/8) dia.

19.05 (3/4) dia.

Control box cover

Good

Pipe

Good

CAUTION

Tighten with 2 wrenches.

Holding wrench

Flare nut

16 to 18 (160 to 180)

32 to 42 (320 to 420)

49 to 61 (490 to 610)

63 to 75 (630 to 750)

90 to 110 (900 to 1,100)

Prohibited