Haier MRVIII-S AV08NMSETA Design, Installation & Maintenance Instruction page 50

3. Pipe "c" diameter (main pipe, between outdoor gather pipe and the fi rst branch pipe)
Outdoor capacity
(kW) Gas pipe (mm)
22.4
28.0
33.5
Note:
When the distance from outdoor to the longest indoor is over 90m, the main pipe should be
enlarged diameter.
Copper pipe selection:
Material
Pipe diameter (mm)
Thickness(mm)
Material
Pipe diameter (mm)
Thickness(mm)
Long pipe and high drop
Main pipe
Liquid pipe (mm)
Ø22.22 Ø9.52
Ø22.22 Ø9.52
Ø25.4 Ø12.7
O type pipe: Soft pipe
Ø6.35 Ø9.52 Ø12.7
0.8 0.8 1.0
Hard pipe
Ø19.05 Ø22.22 Ø25.4
1.0 1.0 1.0
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Enlarged main pipe
Gas pipe (mm) Liquid pipe (mm)
Ø22.22
Ø25.4
Ø28.58
Ø15.88
1.0
Ø28.58 Ø31.8
1.0 1.1
Ø12.7
Ø12.7
Ø12.7