11
ENGLISH
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
90°
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 (D)
Depth of flaring part (A)
Using flaring tool for
R-410A
Using conventional flaring tool
Clutch type
Wing nut type
mm
inch
mm
inch
mm
inch
mm
inch
6.35
1/4
0~0.5
0~0.02
1.0~1.5
0.04~0.06
1.5~2.0
0.06~0.08
9.52
3/8
0~0.5
0~0.02
1.0~1.5
0.04~0.06
1.5~2.0
0.06~0.08
12.70
1/2
0~0.5
0~0.02
1.0~1.5
0.04~0.06
1.5~2.0
0.06~0.08
15.88
5/8
0~0.5
0~0.02
1.0~1.5
0.04~0.06
1.5~2.0
0.06~0.08
5. Check if you flared the pipe correctly. There are some examples of incorrectly flared pipes below.
Correct
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
Flare dimension
Flare shape [mm(inch)]
mm
inch
N·m
Ibf·ft
mm
inch
6.35
1/4
14~18
10.3~13.3
8.7~9.1
0.34~0.36
90° ±2°
45°
±2
°
R 0.4~0.8
(0.016~0.032)
9.52
3/8
34~42
25.1~31.0
12.8~13.2
0.50~0.52
12.70
1/2
49~61
36.1~45.0
16.2~16.6
0.64~0.65
15.88
5/8
68~82
50.2~60.5
19.3~19.7
0.76~0.78
t
In case of needing brazing, you must work with Nitrogen gas blowing.
CAUTION
