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– 37 –
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 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.
Fig. 6-2-1 Flare processing dimensions
Table 6-2-3 Dimensions related to flare processing for R410A / R22
A
ØD
Nominal
diameter
1/4
3/8
1/2
5/8
Outer
diameter
(mm)
6.4
9.5
12.7
15.9
Thickness
(mm)
0.8
0.8
0.8
1.0
A (mm)
Flare tool for
R410A, R22
clutch type
0 to 0.5
0 to 0.5
0 to 0.5
0 to 0.5
Conventional flare tool
(R410A)
Clutch type Wing nut type
1.0 to 1.5 1.5 to 2.0
1.0 to 1.5 1.5 to 2.0
1.0 to 1.5 2.0 to 2.5
1.0 to 1.5 2.0 to 2.5
Conventional flare tool
(R22)
Clutch type Wing nut type
0.5 to 1.0 1.0 to 1.5
0.5 to 1.0 1.0 to 1.5
0.5 to 1.0 1.5 to 2.0
0.5 to 1.0 1.5 to 2.0
Table 6-2-4 Flare and flare nut dimensions for R410A
Table 6-2-5 Flare and flare nut dimensions for R22
Nominal
diameter
1/4
3/8
1/2
5/8
3/4
Outer diameter
(mm)
6.4
9.5
12.7
15.9
19.0
Thickness
(mm)
0.8
0.8
0.8
1.0
1.0
Dimension (mm)
Flare nut width
ABCD
(mm)
9.1 9.2 6.5 13 17
13.0 13.5 9.7 20 22
16.2 16.0 12.9 20 24
19.4 19.0 16.0 23 27
23.3 24.0 19.2 34 36
Nominal
diameter
1/4
3/8
1/2
5/8
Outer diameter
(mm)
6.4
9.5
12.7
15.9
Thickness
(mm)
0.8
0.8
0.8
1.0
Dimension (mm)
Flare nut width
ABCD
(mm)
9.1 9.2 6.5 13 17
13.2 13.5 9.7 20 22
16.6 16.0 12.9 23 26
19.7 19.0 16.0 25 29