SiUS28-902_B
Precautions for New Refrigerant (R-410A)
Appendix
167
1. Flaring tool
Specifications
• Dimension A
Differences
• Change of dimension A
Conventional flaring tools can be used when the work process is changed.
(change of work process)
Previously, a pipe extension margin of 0 to 0.02in. was provided for flaring. For R-410A air
conditioners, perform pipe flaring with a pipe extension margin of 0.04 to 0.06in.
(For clutch type only)
Conventional tool with pipe extension margin adjustment can be used.
Flare gauge
Nominal size
1/4
3/8
1/2
5/8
3/4
Tube O.D.
Do
1/4
3/8
1/2
5/8
3/4
Class-2 (R-410A)
0.36
0.52
0.65
0.78
0.94
Class-1 (Conventional)
0.35
0.51
0.64
0.76
0.92
+
0
−
0.4
Unit:in.
A
Dimension A
For class-1: R-407C
For class-2: R-410A
