Mitsubishi Heavy Industries SRK20ZG-S Tech Manual page 75

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. Be careful. When
using a conventional flare tool, be sure to secure "dimension A" by using a gage for size
adjustment.
Nominal Outer diameter
diameter
1/4
3/8
1/2
5/8
Nominal Outer diameter
diameter
1/4
3/8
1/2
5/8
Nominal Outer diameter
diameter (mm)
1/4 6.35
3/8 9.52
1/2 12.70
5/8 15.88
Table 5. Dimensions related to flare processing for R410A
Thickness
(mm) (mm)
6.35 0.8
9.52 0.8
12.70 0.8
15.88 1.0
Table 6. Dimensions related to flare processing for R22
Thickness
(mm) (mm)
6.35 0.8
9.52 0.8
12.70 0.8
15.88 1.0
B A
Fig.4 Relations between flare nut and flare seal surface
Table 7. Flare and flare nut dimensions for R410A
Thickness
(mm)
A
0.8 9.1
0.8 13.2
0.8 16.6
1.0 19.7
72
-
Flare tool for R410A
Clutch type
0~0.5
0~0.5
0~0.5
0~0.5
Flare tool for R410A
Clutch type
0~0.5
0~0.5
0~0.5
0~0.5
Dimension (mm)
B C
9.2 6.5
13.5 9.7
16.0 12.9
19.0 16.0
-
øD
Fig.3 Flare processing dimensions
A (mm)
Conventional flare tool
Clutch type Wing nut type
1.0~1.5 1.5~2.0
1.0~1.5 1.5~2.0
1.0~1.5 2.0~2.5
1.0~1.5 2.0~2.5
A (mm)
Conventional flare tool
Clutch type Wing nut type
0.5~1.0 1.0~1.5
0.5~1.0 1.0~1.5
0.5~1.0 1.5~2.0
0.5~1.0 1.5~2.0
C
D
[unit: mm]
Flare nut width
D
13 17
20 22
23 26
25 29