Mitsubishi Electric PU(H)Y-P250YGM-A, Руководство по обслуживанию

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Read Before Servicing ]
[3] Piping Materials
1. Copper pipe materials
Œ
The distinction between O-materials (Annealed) and 1/2H-materials (Drawn) is made based on the strength of the pipes
themselves.
ΠO-materials (Annealed) can easily be bent with hands.
Π1/2H-materials (Drawn) are considerably stronger than O-material (Annealed) at the same thickness.
2. Types of copper pipes
3. Piping materials/Radial 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.)
ΠThe 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.
ΠThe 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 R22, R407C etc.
4.30 MPa 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
NO OK
New Piping Existing Piping
Do not use the existing piping!