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5. 4. Pipe connection

CAUTION

Do not use mineral oil on a

ared part. Prevent mineral oil from getting into the system

as this would reduce the lifetime of the units.

While brazing the pipes, be sure to blow dry nitrogen gas through them.

5. 4. 1. Flaring

• Use special pipe cutter and

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 the cuttings will not enter the pipe and remove any

burrs.

(3) Insert the

are nut (always use the

are nut attached to the indoor and outdoor

units respectively) onto the pipe and perform the

are processing with a

are tool.

Leakage of refrigerant may result if other

are nuts are used.

(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from

entering the pipes.

Check if [L] is

ared uniformly

and is not cracked or scratched.

Pipe

Die

Pipe outside

diameter [mm (in.)]

Dimension A (mm)

Dimension B 0

- 0.4

[mm]

Flare tool for R410A,

clutch type

6.35 (1/4)

0 to 0.5

9.1

9.52 (3/8)

13.2

12.70 (1/2)

16.6

15.88 (5/8)

19.7

19.05 (3/4)

24.0

• When

using

conventional

are tools to

are R410A pipes, the dimension A should

be approximately 0.5mm more than indicated in the table (for

aring with R410A

are tools) to achieve the speci

aring. Use a thickness gauge to measure the

dimension A.

Pipe outside

diameter

[mm (in.)]

Width across

ats

of Flare nut

[mm]

6.35 (1/4)

9.52 (3/8)

12.70 (1/2)

15.88 (5/8)

19.05 (3/4)

Width across

ats

5. 4. 2. Bending pipes

CAUTION

To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of
curvature of 100mm or more.

If the pipe is bent repeatedly at the same place, it will break.

•  If pipes are shaped by hand, be careful not to collapse them.
•  Do not bend the pipes at an angle of more than 90°.
•  When pipes are repeatedly bent or stretched, the material will harden, making it dif-

cult to bend or stretch them any more.

• Do not bend or stretch the pipes more than 3 times.

5. 4. 3. Pipe connection

CAUTION

Be sure to install the pipe against the port on the indoor unit and the outdoor unit cor-
rectly. If the centering is improper, the

are nut cannot be tightened smoothly.

If the

are nut is forced to turn, the threads will be damaged.

Do not remove the

are nut from the outdoor unit pipe until immediately before connect-

ing the connection pipe.

After installing the piping, make sure that the connection pipes do not touch the
compressor or outer panel. If the pipes touch the compressor or outer panel, they will
vibrate and produce noise.

(1) Detach the caps and plugs from the pipes.
(2) Center the pipe against the port on the outdoor unit, and then turn the

are nut by hand.

(3) Tighten the

are nut of the connection pipe at the outdoor unit valve connector.

(4) After tightening the

are nut by hand, use a torque wrench to fully tighten it.

3-way valve (Liquid)

3-way valve
(Gas)

Connection pipe
(Liquid)

Flare nut

Connection
pipe (Gas)

Flare nut

CAUTION

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

are nut correctly.

• Outer panel may be distorted if fastened only with a wrench. Be sure to

x the el-

ementary part with a holding wrench (spanner) and fasten with a torque wrench (refer
to below diagram). Do not apply force to the blank cap of the valve or hang a wrench,
etc., on the cap. If blank cap is broken, it may cause leakage of refrigerant.

Blank cap

Flare nut

90°

Torque wrench

Holding
wrench

Torque wrench

Flare nut

[mm (in.)]

Tightening torque

[N·m (kgf·cm)]

6.35 (1/4) dia.

16 to 18 (160 to 180)