– 8 –
d) Flare Processing
Make certain that a clamp bar and
copper pipe have been cleaned.
By means of the clamp bar, perform the
flare processing correctly.
Use either a flare tool for R410A or
conventional flare tool.
Flare processing dimensions differ
according to the type of flare tool. When
using a conventional flare tool, be sure
to secure “dimension A” by using a
gauge for size adjustment.
Table 3-2-3 Dimensions related to flare processing for R410A
Table 3-2-4 Dimensions related to flare processing for R22
Table 3-2-5 Flare and flare nut dimensions for R410A
Nominal
diameter
Outer
diameter
(mm)
Thickness
(mm)
A (mm)
Flare tool for R410A
clutch type
Conventional flare tool
Clutch type
Wing nut type
1/4
6.35
0.8
0 to 0.5
1.0 to 1.5
1.5 to 2.0
3/8
9.52
0.8
0 to 0.5
1.0 to 1.5
1.5 to 2.0
1/2
12.70
0.8
0 to 0.5
1.0 to 1.5
2.0 to 2.5
5/8
15.88
1.0
0 to 0.5
1.0 to 1.5
2.0 to 2.5
Nominal
diameter
Outer
diameter
(mm)
Thickness
(mm)
A (mm)
Flare tool for R22
clutch type
Conventional flare tool
Clutch type
Wing nut type
1/4
6.35
0.8
0 to 0.5
0.5 to 1.0
1.0 to 1.5
3/8
9.52
0.8
0 to 0.5
0.5 to 1.0
1.0 to 1.5
1/2
12.70
0.8
0 to 0.5
0.5 to 1.0
1.5 to 2.0
5/8
15.88
1.0
0 to 0.5
0.5 to 1.0
1.5 to 2.0
Nominal
diameter
Outer diameter
(mm)
Thickness
(mm)
Dimension (mm)
Flare nut width
(mm)
A
B
C
D
1/4
6.35
0.8
9.1
9.2
6.5
13
17
3/8
9.52
0.8
13.2 13.5 9.7
20
22
1/2
12.70
0.8
16.0 16.6 12.9 23
26
5/8
15.88
1.0
19.0 19.7 16.0 25
29
A
ØD
Fig. 3-2-1 Flare processing dimensions
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