– 28 –
c) Insertion of Flare Nut
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 conven-
tional flare tool.
Flare processing dimensions differ according
to the type of flare tool. When using a con-
ventional flare tool, be sure to secure “dimen-
sion A” by using a gauge for size adjust-
ment.
Fig. 2-2-1 Flare processing dimensions
Table 2-2-3 Dimensions related to flare processing for R410A
A
ØD
Nominal
diameter
1/4
3/8
1/2
Outer
diameter
(mm)
6.35
9.52
12.70
Thickness
(mm)
0.8
0.8
0.8
A (mm)
Flare tool for
Conventional flare tool
R410A clutch type
Clutch type Wing nut type
0 to 0.5 1.0 to 1.5 1.5 to 2.0
0 to 0.5 1.0 to 1.5 1.5 to 2.0
0 to 0.5 1.0 to1.5 2.0 to 2.5
Table 2-2-4 Dimensions related to flare processing for R22
Nominal
diameter
1/4
3/8
1/2
Outer
diameter
(mm)
6.35
9.52
12.70
Thickness
(mm)
0.8
0.8
0.8
A (mm)
Flare tool for
Conventional flare tool
R22 clutch type
Clutch type Wing nut type
0 to 0.5 0.5 to 1.0 1.0 to 1.5
0 to 0.5 0.5 to 1.0 1.0 to 1.5
0 to 0.5 0.5 to1.0 1.5 to 2.0
Table 2-2-5 Flare and flare nut dimensions for R410A
Nominal
diameter
1/4
3/8
1/2
Outer diameter
(mm)
6.35
9.52
12.70
Thickness
(mm)
0.8
0.8
0.8
Dimension (mm)
ABCD
9.1 9.2 6.5 13
13.2 13.5 9.7 20
16.6 16.0 12.9 23
Flare nut
width
(mm)
17
22
26
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