Fujitsu AOU36RLAVM Installation Manual Download Page 9

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Pipe outside diameter

[in (mm)]

Dimension A [in (mm)]

0 (0)

Dimension B

-0.015

(-0.4)

[in (mm)]

Flare tool for R410A, clutch

type

1/4 (6.35)

0 to 0.020

(0 to 0.5)

3/8 (9.1)

3/8 (9.52)

1/2 (13.2)

1/2 (12.70)

5/8 (16.6)

5/8 (15.88)

3/4 (19.7)

3/4 (19.05)

15/16 (24.0)

When using conventional (R22)

are tools to

are R410A pipes, the dimension A should

be approximately 0.020 in (0.5 mm) 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. It is recommended that a R410A

aring tool is used.

Width across

ats

Pipe outside diameter

[in (mm)]

Width across flats of Flare

nut [in (mm)]

1/4 (6.35)

11/16 (17)

3/8 (9.52)

7/8 (22)

1/2 (12.70)

1 (26)

5/8 (15.88)

1-1/8 (29)

3/4 (19.05)

1-7/16 (36)

5. 4. 2. Bending pipes

CAUTION

To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curva-
ture of 4 in (100 mm) 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 compres-
sor 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 elementary

part with a holding wrench (spanner) and fasten with a torque wrench (refer to below dia-
gram). 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.

5. 3. Opening the knockout hole

CAUTION

Be careful not to deform or scratch the panel while opening the knockout holes.

To protect the piping insulation after opening a knockout hole, remove any burrs from
the edge of the hole. It is recommended to apply rust prevention paint to the edge of the
hole.

• Pipes can be connected from 4 directions, front, lateral side, rear side and bottom.

(Fig. A)

• When connecting at the bottom, remove the service panel and piping cover on the front

of the outdoor unit, and open the knockout hole provided at the bottom corner of the pip-
ing outlet.

• It can be installed as shown on “Fig. B” cutting out the 2 slits as indicated on “Fig. C”.

(When cutting slits, use a steel saw.)

Fig. A

Service

panel

Slit

Fig. B

Bottom

connection

Fig. C

Front connection

Lateral connection

Bottom connection

Rear connection

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.

The maximum lengths of this product are shown in the table. If the units are further apart
than this, correct operation cannot be guaranteed.

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.