12
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
y
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 specified in the chart belo . (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
y
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.)
y
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 R410 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/R32
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 flare tool is used to machine flares on units at 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 dimension of pipes
Size
Dimension B
R410A/R32(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
