E-
14
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
A (inch)
Flare tool for
R410A clutch type
Conventional flare tool
Clutch type
Wing nut type
1/4 inch(6.35mm)
0~0.020
0.039~0.059
0.059~0.079
3/8 inch (9.52mm)
0~0.020
0.039~0.059
0.059~0.079
1/2 inch(12.70mm)
0~0.020
0.039~0.059
0.059~0.079
5/8 inch (15.88mm)
0~0.020
0.039~0.059
0.059~0.079
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(ft•lb)
Flare dimension
(inch)
Flare shape
(inch)
1/4 inch(6.35mm) 10.46~12.63 ft•lb
0.34~0.36
3/8 inch (9.52mm) 24.02~29.36 ft•lb
0.50~0.52
1/2 inch(12.70mm) 36.43~44.37 ft•lb
0.64~0.65
5/8 inch (15.88mm) 45.45~55.48 ft•lb
0.76~0.78
90
° ±
2°
45
° ±
2°
R 0.016~0.031
In case of needing brazing, you must work with Nitrogen gas blowing.
CAUTION
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