11
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.
Flaring tool
Clutch type
Wing nut type
A
Die
Copper pipe
York
Die
Copper pipe
Flare nut
4
Carry out flaring work using flaring tool as shown below.
Outer diameter
D(mm)
A(mm)
Flare tool for
R410A 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.
Uneven Thickness
Cracked
Damaged Surface
Inclined
Correct
6
Align the pipes and tighten the flare nuts first manually and then with a torque
wrench, applying the following torque.
Outer diameter
D(mm)
Connection Torque Flare dimension
A(mm)
Flare shape
(mm)
kgf•cm
N•m
6.35
140~180
14~18
8.70~9.10
90° ±2°
45° ±2°
R 0.4~0.8
D
A
9.52
350~430
34~42
12.80~13.20
12.70
500~620
49~61
16.20~16.60
15.88
690~830
68~82
19.30~19.70
In case of needing brazing, you must work with Nitrogen gas blowing.
NASA_Big Duct_AM@@@FNHDEH@_IM_EN_03653A-06.indd 11
2016-12-01 오후 3:06:52