23
English
Installation Procedure
Cutting or flaring the pipes
1 Make sure that you prepared the required tools.
– Pipe cutter, Deburring tool, flaring tool and pipe holder, etc.
2 If you want to shorten the pipe, cut it with a pipe cutter
ensuring that the cut edge remains at 90° with the side of the
pipe.
– Refer to below illustrations for correct and incorrect
examples of cut edges.
90°
Oblique Rough Burr
3 To prevent a gas leak, remove all burrs at the cut edge of the
pipe using a Deburring tool.
4 Carry out flaring work using flaring tool as shown below.
A
Flaring bar
Pipe
Yoke
Flaring bar
Pipe
Flare nut
Clutch type Wing nut type
[Flaring tools]
D
A
Pipe
diameter
[D, mm
(inch)]
Depth of flaring part [A, mm (inch)]
Using
flaring tool
for R-410A
Using conventional
flaring tool
Clutch type
Wing nut
type
ø6.35(ø1/4)
ߢߢߧ
࣑ߢߢߢߤ࣒
ߣߢߣߧ
࣑ߢߢߦߢߢߨ࣒
ߣߧߤߢ
࣑ߢߢߨߢߢߪ࣒
ø9.52(ø3/8)
ø12.70(ø1/2)
ø15.88(ø5/8)
5 Check that you flared the pipe correctly.
– Refer to below illustrations for correct and incorrect
examples of flared pipe.
Uneven
Thickness
CrackedDamaged
Surface
InclinedCorrect
CAUTION
• If foreign matters or burrs are not removed after cutting pipe,
refrigerant gas may leak.
• If foreign matters enter inside the pipe, important interior
parts of the unit may get damaged or product efficiency will be
reduced. So, the direction of pipe should be downward during
pipe cutting or flaring.
Connecting the flared pipes
• Check if the flaring is properly done according to the standard
size.
• Align the center of the piping and tighten the flare nut with
your hands. Then, tighten the flare nut with torque wrench in a
direction of the arrow indicated in below illustration.
• Make sure to use ester oil to coat the flare connection section.
Flare connection
section
Flare nut
Pipe
Monkey
wrench
Torque
wrench
Outer
diameter (D)
Torque
Flare
dimension (L)
Flare shape (mm)
mm inch N·m lbf·ft mm inch
90° ±2°
45° ±2°
ŵߢߦߢߪ
࣑ߢߢߣߨߢߢߥߤ࣒
L
D
6.35 1/4
ߣߦ
18
ߣߢߥ
13.3
ߪߩ
9.1
ߢߥߦ
0.36
9.52 3/8
ߥߦ
42
ߤߧߣ
31.0
ߣߤߪ
13.2
ߢߧߢ
0.52
12.7 1/2
ߦ߫
61
ߥߨߣ
45.0
ߣߨߤ
16.6
ߢߨߦ
0.65
15.88 5/8
ߨߪ
82
ߧߢߤ
60.5
ߣ߫ߥ
19.7
ߢߩߨ
0.78
CAUTION
• Blowing Nitrogen gas should be done when welding the pipe.
• Make sure to use the provided flare nut.
• Make sure that there are no cracks or twisted part when you
need to bend the pipe.
• Do not fasten the flare nut with excessive strength.
• R-410A is a high pressure refrigerant and there is a risk of
refrigerant leakage if the flare connection is not coated with
ester oil. Therefore, apply ester oil to coat the flare connection
area.
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