Fujitsu 24LMAS1 Instrukcja instalacji - Strona 7

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3.5.2. Pipe connection

 Brazing

• If air or another type of refrigerant enters the refrigeration cycle, the internal

pressure in the refrigeration cycle will become abnormally high and prevent the unit

from exerting its full performance.

• Apply nitrogen gas while brazing the pipes. If a pipe is brazed without applying

nitrogen gas, an oxidation film will be created.

This can degrade performance or damage the parts

in the unit (such as the compressor or valves).

Nitrogen gas pressure: 6 inHg (0.02 MPa)

(= pressure felt sufficiently on the back of the hand)

• For brazing material, use phosphor copper

that does not require flux. Do not use flux to

braze pipes. If the flux is the chlorine type, it will

cause the pipes to corrode.

Furthermore, if the flux contains fluoride, it will adversely affect the refrigerant pipe

system such as by degrading the refrigerant.

If fluoride is contained, quality of refrigerant deteriorates and affects the refrigerant

piping system.

 Flaring

• Do not use mineral oil on a flared 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.

• Use special pipe cutter and flare 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 flare nut (always use the flare nut attached to the indoor and outdoor

units respectively) onto the pipe and perform the flare processing with a flare tool.

Leakage of refrigerant may result if other flare 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 flared uniformly and

is not cracked or scratched.

Dimension A [in (mm)]

Pipe outside diameter

Flare tool for R410A,

[in (mm)]

clutch type

1/4 (6.35)

3/8 (9.52)

1/2 (12.70)

5/8 (15.88)

3/4 (19.05)

• When using conventional flare tools to flare R410A pipes, the dimension A should

be approximately 0.020 in (0.5 mm) more than indicated in the table (for flaring with

R410A flare tools) to achieve the specified flaring. Use a thickness gauge to measure

the dimension A.

Width across flats

Pipe outside diameter

1/2 (12.70)

5/8 (15.88)

3/4 (19.05)

 Bending pipes

• To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of

curvature of 3-15/16 in (100 mm) to 5-7/8 in (150 mm).

• 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

difficult to bend or stretch them anymore.

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

CAUTION

Pressure regulating valve

Cap

Nitrogen gas

Brazing area

CAUTION

Die

Pipe

Dimension B [in (mm)]

3/8 (9.1)

1/2 (13.2)

0 to 0.020

5/8 (16.6)

(0 to 0.5)

3/4 (19.7)

15/16 (24.0)

Width across flats of Flare

[in (mm)]

nut [in (mm)]

1/4 (6.35)

11/16 (17)

3/8 (9.52)

7/8 (22)

1 (26)

1-1/8 (29)

1-7/16 (36)

CAUTION

 Connecting pipes

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

correctly. If the centering is improper, the flare nut cannot be tightened smoothly. If

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

• Do not remove the flare nut from the outdoor unit pipe until immediately before

connecting 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 flare nut by

hand.

(3) Tighten the flare nut of the connection pipe at the outdoor unit valve connector.

3-way valve (Liquid)

Flare nut

Connection pipe

(Liquid)

(4) After tightening the flare nut by hand, use a torque wrench to fully tighten it.

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

to tighten the flare nut correctly.

• Fasten a flare nut with a torque wrench as instructed in this manual. If fastened too

tight, the flare nut may be broken after a long period of time and cause a leakage of

refrigerant.

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

elementary part with a spanner and fasten with a wrench. (Refer to the following

figure.)

• Do not apply force to the blank cap of the valve or hang a wrench, etc., on the cap. It may

cause leakage of refrigerant.

Holding

wrench

To prevent gas leakage, coat the

flare surface with refrigerator oil.

Flare nut [in (mm)]

1/4 (6.35) dia.

3/8 (9.52) dia.

1/2 (12.70) dia.

5/8 (15.88) dia.

3/4 (19.05) dia.

 Handling precautions for the valves

• Mounted part of blank cap is sealed for protection.

• Fasten blank cap tightly after opening valves.

Blank cap [in (mm)]

1/4 (6.35)

3/8 (9.52)

1/2 (12.70)

5/8 (15.88)

3/4 (19.05)

CAUTION

3-way valve (Gas)

Flare nut

Connection pipe

(Gas)

CAUTION

Flare nut

Torque

90°

wrench

Torque wrench

Tightening torque [lbf·ft (N·m)]

11.8 to 13.3 (16 to 18)

23.6 to 31.0 (32 to 42)

36.1 to 45.0 (49 to 61)

46.5 to 55.3 (63 to 75)

66.4 to 81.1 (90 to 110)

Table A

Tightening torque [lbf·ft (N·m)]

14.8 to 18.4 (20 to 25)

18.4 to 22.1 (25 to 30)

22.1 to 25.8 (30 to 35)

25.8 to 29.5 (35 to 40)

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