Flare Connection; Pipe Connection - Fujitsu WOYK150LJL Installation Manual

For brazing material, use phosphor copper that does not require fl ux. Do not use fl ux to
braze pipes. If the fl ux is the chlorine type, it will cause the pipes to corrode.
Furthermore, if the fl ux contains fl uoride, it will adversely affect the refrigerant pipe
system such as by degrading the refrigerant.
If fl uoride is contained, quality of refrigerant deteriorates and affects the refrigerant
piping system.

5.3. Flare connection

Do not use mineral oil on a fl ared part. Prevent mineral oil from getting into the system
as this would reduce the lifetime of the units.
While welding 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.
5.3.1. Flaring
• Use special pipe cutter and fl 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 fl are nut (always use the fl are nut attached to the indoor and outdoor
units respectively) onto the pipe and perform the fl are processing with a fl are tool.
Leakage of refrigerant may result if other fl 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 fl ared uniformly
and is not cracked or scratched.
L
Dimension A
Pipe outside diameter
Flare tool for R410A,
[mm (in.)]
clutch type
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
• When using conventional fl are tools to fl are R410A pipes, the dimension A should
be approximately 0.5 mm more than indicated in the table (for fl aring with R410A
fl are tools) to achieve the specifi ed fl aring. Use a thickness gauge to measure the
dimension A.
Width across fl ats
diameter

5.4. Pipe connection

5.4.1. Bending pipes
To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of
curvature of 100 mm to 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
diffi cult to bend or stretch them anymore.
• Do not bend or stretch the pipes more than three times.
CAUTION
CAUTION
B
Die
A
Pipe
[mm]
0
Dimension B
- 0.4
9.1
13.2
0 to 0.5 16.6
19.7
24.0
Pipe outside Width across fl ats
of Flare nut
[mm (in.)] [mm]
6.35 (1/4) 17
9.52 (3/8) 22
12.70 (1/2) 26
15.88 (5/8) 29
19.05 (3/4) 36
CAUTION
5.4.2. Pipe connection
Be sure to install the pipe against the port on the indoor unit and the outdoor unit
correctly. If the centering is improper, the fl are nut cannot be tightened smoothly. If the
fl are nut is forced to turn, the threads will be damaged.
Do not remove the fl are 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 fl are nut by
hand.
(3) Tighten the fl are nut of the connection pipe at the outdoor unit valve connector.
3-way valve (Liquid)
Flare nut
Connection pipe
(Liquid)
(4) After tightening the fl are 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 fl are nut correctly.
• Outer panel may be distorted if fastened only with a wrench. Be sure to fi x the
elementary part with a spanner and fasten with a wrench (refer to below diagram).
• 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.
Blank cap
[mm]
Holding
wrench
Flare nut
[mm (in.)]
6.35 (1/4) dia.
9.52 (3/8) dia.
12.70 (1/2) dia.
15.88 (5/8) dia.
19.05 (3/4) dia.
* Connection example
Front connection
Liquid pipe
Gas pipe
(locally purchased)
(locally purchased)
CAUTION
3-way valve (Gas)
Flare nut
Connection pipe
(Gas)
CAUTION
Flare nut
Torque wrench
90°
Torque wrench
Tightening torque
[N·m (kgf·cm)]
16 to 18 (160 to 180)
32 to 42 (320 to 420)
49 to 61 (490 to 610)
63 to 75 (630 to 750)
90 to 110 (900 to 1100)
Lateral connection
Auxiliary pipe
Liquid pipe
(accessory)
(locally purchased)
Auxiliary pipe
(accessory)
Gas pipe
(locally purchased)
En-6