– 23 –

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

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
19.1
Thickness
(mm)
0.8
0.8
0.8
1.0
1.0
Dimension (mm)
ABCD
9.1 9.2 6.5 13
13.0 13.5 9.7 20
16.2 16.0 12.9 20
19.4 19.0 16.0 23
23.3 24.0 19.2 34
Flare nut width
(mm)
17
22
24
27
36
Nominal
diameter
1/4
3/8
1/2
5/8
3/4
Outer diameter
(mm)
6.4
9.5
12.7
15.9
19.1
Thickness
(mm)
0.8
0.8
0.8
1.0
1.2
Dimension (mm)
ABCD
9.1 9.2 6.5 13
13.2 13.5 9.7 20
16.6 16.0 12.9 23
19.7 19.0 16.0 25
24.0 — 19.2 28
Flare nut width
(mm)
17
22
26
29
36
Nominal
diameter
1/4
3/8
1/2
5/8
3/4
Outer
diameter
(mm)
6.4
9.5
12.7
15.9
19.1
Thickness
(mm)
0.8
0.8
0.8
1.0
1.2
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
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
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
——
A
ØD