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6.2. Piping Materials
6.2 Types of Copper Pipes (Reference)
Maximum Operation Pressure Applicable Refrigerants
3.4MPa R22, R407C
4.15MPa R410A
4.3MPa R32
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Use pipes that meet the local standards.
Piping MaterialslRadial Thickness
Use pipes made of phosphorus deoxidized copper.
Since the operation pressure of the units that use R410A is higher than that of the units for use with R22, use pipes with
at least the radial thickness specied in the chart below. (Pipes with a radial thickness of 0.7mm or less may not be used.)
Size(mm) Size(inch) Radial Thickness(mm) Type
Φ 6.35 1/4'' 0.8t
Type-O pipes
Φ 9.52 3/8'' 0.8t
Φ 12.7 1/2'' 0.8t
Φ 15.88 5/8'' 1.0t
Φ 19.05 3/4'' 1.0t Type-1/2H or Hpipes
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Although it was possible to use type-O for pipes with a size of up to Φ19.05(3/4") with conventional refrigerants,
use type- 1/2H pipes for units that use R410A. (Type-O pipes may be used if the pipe size is Φ19.05 and the radial
thickness is 1.2t.)
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The table shows the standards in Japan. Using this table as a reference, choose pipes that meet the local standards.
Flare Machining (type-O and OL only)
The are machining dimensions for units that use R410A is larger than those for units that use R22 in order to increase
air tightness.
Flare Machining Dimension(mm)
External dimension of pipes Size
Dimension A
R410A R22
Φ 6.35 1/4" 9.1 9.0
Φ 9.52 3/8" 13.2 13.0
Φ 12.7 1/2" 16.6 16.2
Φ 15.88 5/8" 19.7 19.4
Φ 19.05 3/4" 24.0 23.3
If a clutch type are tool is used to machine ares on units that use R410A, make the protruding part of the pipe between 1.0
and 1.5mm. Copper pipe gauge for adjusting the length of pipe protrusion is useful.
Flare Nut
Type-2 are nuts instead of type-1 nuts are used to increase the strength. The size of some of the are nuts have also
been changed.
Flare nut dimension(mm)
External dimension of pipes Size Dimension B
R410A(Type2) R22(Type1)
Φ 6.35 1/4" 17.0 17.0
Φ 9.52 3/8" 22.0 22.0
Φ 12.7 1/2" 26.0 24.0
Φ 15.88 5/8" 29.0 27.0
Φ 19.05 3/4" 36.0 36.0
Using this table as a reference, choose pipes that meet the local standards.
Dimension A
Dimension B
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