Piping Materials/Radial 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 specified 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
Φ6.35
1/4”0.8t
Type-O pipes
Φ9.52
3/8”0.8t
Φ12.7 1/2” 0.8t
Φ15.88 5/8” 1.0t
Φ19.05
3/4”1.0t Type-1/2H or Hpipes
Although it was possible to use type-O for pipes with a size of up to Φ 19 .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 Φ 19 .05 and the
radial thickness is 1 .2t .)
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 flare 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
pipes
Size
R410A R22
Φ6.35 1/4”9.1 9.0
Φ9.52 3/8”13.2 13.0
Φ12.7 1/2”
Φ15.88 5/8” 19.7 19.4
Φ19.05 3/4”24.0 23.3
If a clutch type flare tool is used to machine flares 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 flare nuts instead of type-1 nuts are used to increase the strength . The size of some of the flare nuts have
also been changed .
Flare nut dimension(mm)
External
pipes
Size
R410A R22
Φ6.35 1/4”17.0 17.0
Φ9.52 3/8”22.0 22.0
Φ12.7 1/2” 26.0 24.0
Φ15.88 5/8”
Φ19.05 3/4”36.0 36.0
Using this table as a reference, choose pipes that meet the local
standards.
Dimension B
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