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Cutting/Flaring the Pipes
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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
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
Outer diameter
Flare tool for
R410A clutch type
1/4 inch(6.35mm)
0~0.020
3/8 inch (9.52mm)
0~0.020
1/2 inch(12.70mm)
0~0.020
5/8 inch (15.88mm)
0~0.020
5
Check if you flared the pipe correctly. There are some examples of
incorrectly flared pipes below.
Inclined
Damaged Surface
6
Align the pipes and tighten the flare nuts first manually and then with a torque
wrench, applying the following torque.
Connection
Outer diameter
Torque(ft•lb)
1/4 inch(6.35mm)
10.46~12.63 ft•lb
3/8 inch (9.52mm) 24.02~29.36 ft•lb
1/2 inch(12.70mm) 36.43~44.37 ft•lb
5/8 inch (15.88mm) 45.45~55.48 ft•lb
CAUTION
In case of needing brazing, you must work with Nitrogen gas blowing.
Rough
Burr
A
York
Die
Copper pipe
Copper pipe
Flare nut
A (inch)
Conventional flare tool
Clutch type
Wing nut type
0.039~0.059
0.059~0.079
0.039~0.059
0.059~0.079
0.039~0.059
0.059~0.079
0.039~0.059
0.059~0.079
Cracked
Uneven Thickness
Flare dimension
Flare shape
(inch)
(inch)
0.34~0.36
R 0.016~0.031
0.50~0.52
0.64~0.65
0.76~0.78
Die
2009-8-31 10:27:18
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