Haier Smart Power Series Service Manual page 139

Smart Power
7.4.2 Piping Materials
Types of Copper Pipes (Reference)
Maximum Operation Pressure
3.4MPa
4.15MPa
• Use pipes that meet the local standards.
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)
Ф6.35
Ф9.52
Ф12.7
Ф15.88
Ф19.05
• Although it was possible to use type-O for pipes with a size of up to 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 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 dimension
Size
of pipes
Ф6.35 1/4"
Ф9.52 3/8"
Ф12.7 1/2"
Ф15.88 5/8"
Ф19.05 3/4"
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.
Size (inch) Radial Thickness (mm)
1/4''
3/8''
1/2''
5/8''
3/4''
Dimension A
R410A R22
9.1 9.0
13.2 13.0
16.6 16.2
19.7 19.4
24.0 23.3
137
Applicable Refrigerants
R22, R407C
R410A
0.8t
0.8t
0.8t
1.0t
1.0t Type-1/2H or H pipes
Type
Type-O pipes