Fujitsu 24LMAS1 Kurulum Kılavuzu - Sayfa 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
B
Die
A
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)
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)
En-7