10
Cutting/flaring the pipes
1
Make sure that you prepared the required tools.
(pipe cutter, reamer, flaring tool and pipe holder)
2
If you want to shorten the pipe, cut it using a pipe cutter ensuring that
the cut edge remains at 90° with the side of the pipe. There are some
examples of correctly and incorrectly cut edges below.
Oblique
Rough
Burr
3
To prevent a gas leak, remove all burrs at the cut edge of the pipe using a
reamer.
4
Carry out flaring work using flaring tool as shown below.
Flaring tool
Clutch type
Wing nut type
A
Die
Copper pipe
York
Die
Copper
pipe
Flare nut
Outer diameter
(mm)
A(mm)
Flare tool for
R410AA clutch type
Conventional flare tool
Clutch type
Wing nut type
6.35
0~0.5
1.0~1.5
1.5~2.0
9.52
0~0.5
1.0~1.5
1.5~2.0
12.70
0~0.5
1.0~1.5
1.5~2.0
15.88
0~0.5
1.0~1.5
1.5~2.0
5
Check if you flared the pipe correctly. There are some examples of
incorrectly flared pipes below.
6
Align the pipes and tighten the flare nuts first manually and then with a
torque wrench, applying the following torque.
Outer diameter
(mm)
Connection
Torque(kgf•cm)
Flare dimension
(mm)
Flare shape
(mm)
6.35
145~175
8.70~9.10
R 0.4~0.8
90
° ±
2°
45
° ±
2°
9.52
333~407
12.80~13.20
12.70
505~615
16.20~16.60
15.88
630~769
19.30~19.70
Inclined Damaged Surface Cracked Uneven Thickness
Incaseofneedingbrazing,youmustworkwithNitrogengasblowing.
