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A Cutting/flaring the pipes
1
Make sure that you prepared the required tools.
(pipe cutter, reamer, flaring tool and pipe holder)
If you want to shorten the pipe, cut it using a pipe cutter ensuring that the
2
cut edge remains at 90° with the side of the pipe. There are some examples of
correctly and incorrectly cut edges below.
Oblique
3
To prevent a gas leak, remove all burrs at the cut edge of the pipe using a reamer.
Carry out flaring work using flaring tool as shown below.
4
Flaring tool
Clutch type
Wing nut type
Outer diameter (D)
Using flaring tool
mm
inch
6.35
1/4
9.52
3/8
12.70
1/2
15.88
5/8
5
Check if you flared the pipe correctly. There are some examples of incorrectly
flared pipes below.
Inclined Damaged Surface Cracked Uneven Thickness
6
Align the pipes and tighten the flare nuts first manually and then with a torque
wrench, applying the following torque.
Outer diameter
Connection Torque
mm
inch
N·m
6.35
1/4
14~18
9.52
3/8
34~42
12.70
1/2
49~61
15.88
5/8
68~82
19.05
3/4
100~120
In case of needing brazing, you must work with Nitrogen gas blowing.
Caution
Rough
A
Die
Copper pipe
Flare nut
Depth of flaring part (A)
Using conventional flaring tool
for R-410A
Clutch type
mm
inch
mm
0~0.5
0~0.02
1.0~1.5
0~0.5
0~0.02
1.0~1.5
0~0.5
0~0.02
1.0~1.5
0~0.5
0~0.02
1.0~1.5
Flare dimension
Ibf·ft
mm
10.3~13.3
8.7~9.1
25.1~31.0
12.8~13.2
36.1~45.0
16.2~16.6
50.2~60.5
19.3~19.7
73.8~88.5
23.6~24.0
Burr
York
Die
Copper
pipe
Wing nut type
inch
mm
inch
0.04~0.06
1.5~2.0
0.06~0.08
0.04~0.06
1.5~2.0
0.06~0.08
0.04~0.06
1.5~2.0
0.06~0.08
0.04~0.06
1.5~2.0
0.06~0.08
Flare shape
[mm(inch)]
inch
0.34~0.36
R 0.4~0.8
0.50~0.52
(0.016~0.032)
0.64~0.65
0.76~0.78
0.93~0.94
23
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