Fujitsu AUXG-KRLB Series Скачать руководство пользователя страница 8

Страница: 8 / 16

En-8

3. 5. Pipe installation

WARNING

• During installation, make sure that the refrigerant pipe is attached

rmly before you

run the compressor.

• Do not operate the compressor under the condition of refrigerant piping not attached

properly with 2-way or 3-way valve open. This may cause abnormal pressure in the
refrigeration cycle that leads to breakage and even injury.

• During the pump-down operation, make sure that the compressor is turned off

before you remove the refrigerant piping.

• Do not remove the connection pipe while the compressor is in operation with 2-way

or 3-way valve open. This may cause abnormal pressure in the refrigeration cycle
that leads to breakage and even injury.

• When installing and relocating the air conditioner, do not mix gases other than the

speci

ed refrigerant R410A or R32 to enter the refrigerant cycle.

• If air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise

to an abnormally high value and cause breakage, injury, etc.

• If refrigerant leaks while work is being carried out, ventilate the area. If the

refrigerant comes in contact with a

ame, it produces a toxic gas.

CAUTION

• Be more careful so that foreign matter (oil, water, etc.) does not enter the piping

than with refrigerant R410A or R32 models. Also, when storing the piping, securely
seal the openings by pinching, taping, etc.

• While brazing the pipes, be sure to purge with dry nitrogen gas.

3.5.1. Pipe connection

■

Flaring

Use special pipe cutter and

are tool designed for R410A or R32 pipework.

(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

are nut (always use the

are nut attached to the indoor unit(s) and outdoor

unit or branch box respectively) onto the pipe and perform the

are processing with a

are tool. Use the special R410A or R32

are tool, or the conventional

are tool. Leak-

age 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.

Die

Pipe

Pipe outside diameter

[mm (in.)]

Dimension A [mm]

Dimension B

0.4

[mm]

Flare tool for R32, 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 R32 pipes, the dimension A should be approxi-

mately 0.5 mm more than indicated in the table (for

aring with R32

are tools) to achieve

the speci

aring. Use a thickness gauge to measure the dimension A.

Width across

ats

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)

NOTES:

The

are nut speci

cation is compliant with ISO14903.

■

Bending pipes

•  If pipes are shaped by hand, be careful not to collapse them.
•  Do not bend the pipes at an angle more than 90°.
•  When pipes are repeatedly bend 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.

CAUTION

• To prevent breaking of the pipe, avoid sharp bends.
• If the pipe is bent repeatedly at the same place, it will break.

■

Flare connection

CAUTION

• Be sure to connect the pipe against the port on the indoor unit and the outdoor unit

correctly. If the centering is improper, the

are nut cannot tightened smoothly. If the

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