Mitsubishi P336 User Manual

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I  Read Before Servicing ] 

- 5 -

HWE09120

GB

ŒThe distinction between O-materials (Annealed) and 1/2H-materials (Drawn) is made based on the strength of the pipes them-

selves.

ŒO-materials (Annealed) can easily be bent with hands. 

Œ1/2H-materials (Drawn) are considerably stronger than O-material (Annealed) at the same thickness.

Use refrigerant pipes made of phosphorus deoxidized copper.
The operation pressure of the units that use R410A is higher than that of the units that use R22. 
Use pipes that have 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.)

ŒThe pipes in the system that uses the refrigerant currently on the market are made with O-material (Annealed), even if the 

pipe diameter is less than ø19.05 (3/4"). For a system that uses R410A, use pipes that are made with 1/2H-material  (Drawn) 
unless the pipe diameter is at least ø19.05 (3/4") and the radial thickness is at least 1.2t.

ŒThe figures in the radial thickness column are based on the Japanese standards and provided only as a reference. Use pipes 

that meet the local standards.

O-material (Annealed)

Soft copper pipes (annealed copper pipes). They can easily be bent with hands.

1/2H-material (Drawn)

Hard copper pipes (straight pipes). They are stronger than the O-material (Annealed) 
at the same radial thickness.

Maximum working pressure

Refrigerant type

3.45 MPa [500psi]

R22, R407C etc.

4.30 MPa [624psi]

R410A etc.

Pipe size (mm[in])

Radial thickness (mm)

Type

ø6.35

[1/4"]

0.8t

O-material (Annealed)

ø9.52

[3/8"]

0.8t

ø12.7

[1/2"]

0.8t

ø15.88

[5/8"]

1.0t

ø19.05

[3/4"]

1.0t

1/2H-material, 

H-material (Drawn)

ø22.2

[7/8"]

1.0t

ø25.4

[1"]

1.0t

ø28.58

[1-1/8"]

1.0t

ø31.75

[1-1/4"]

1.1t

ø34.93

[1-3/8"]

1.1t

ø41.28

[1-5/8"]

1.2t

Do not use the existing piping!