Type-O pipes
Soft copper pipes (annealed copper pipes)
They can be bent easily with hands.
Type-1/2H pipes
Hard copper pipes (straight pipes)
Stronger than type-O pipes of the same radial thickness.
- 8 -
[3] Piping Materials
NO
OK
New Piping
Existing Piping
Do not use the existing piping!
<Types of copper pipe>
• The distinction between type-O and type-1/2H pipes is made based on the strength of the pipes themselves.
• Type-O pipes are soft and can easily be bent with hands.
• Type-1/2H pipes are considerably stronger than type-O pipes of the same radial thickness.
Use pipes made of phosphorus deoxidized copper.
Since the operation pressure of the units that use R401A 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 0.7 mm or less may not be used.)
Maximum Operation Pressure
Applicable Refrigerants
3.45 MPa
4.30 MPa
R22, R407C etc.
R410A
<Types of Copper Pipes (Reference)>
✻
Use pipes that meet the local standards.
Type-O pipes
Type-1/2H or
H pipes
Size(mm)
Size(inch)
Radial Thickness(mm)
Type
ø
6.35
ø
9.52
ø
12.7
ø
15.88
ø
19.05
ø
22.2
ø
25.4
ø
28.58
ø
31.75
1/4”
3/8”
1/2”
5/8”
3/4”
7/8”
1”
1 1/8”
1 1/4”
0.8t
0.8t
0.8t
1.0t
1.0t
1.0t
1.0t
1.0t
1.1t
<Piping Materials/Radial Thickness>
✻
Although it was possible to use type-O for pipes with a size of up to
ø
19.05 (3/4”) with conventional refriger-
ants, use type-1/2H pipes for units that use R410A. (Type-O pipes may be used if the pipe size is
ø
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.
