Gree GMV-PD160W/NAB-M

72
DC Inverter Multi
VRF Service Manual
5.6 Installation of Refrigerant Piping
5.6.1 Precautions on piping works
At the site of transport, storage and construction, the two ends of copper pipes shall be sealed with
plastic sealing caps. Before welding, copper pipes must be cleaned (washing the inner side of pipe with alcohol)
to ensure no dust and no water in pipeline
Nitrogen-filled welding shall be used for the welding of copper pipes. Nitrogen pressure shall be
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When multiple multi-connected units are installed, refrigerant piping must be marked to avoid confusion
between pipes of different units.
A two-way drier shall be mounted at the liquid pipe side at the place where an outdoor unit is connected.
5.6.2 Assemble copper pipes
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overlap. The position shall be determined for welding. To ensure correct mounting size, do not determine the
position with your hands, thus to prevent the copper pipe from moving when heated.
See below for the welding size of copper pipe:
A
B
D
Outer diameter of pipe D(mm)
Minimum depth of
penetration B(mm)
Clearance between
pipes A-D
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0.05~0.21
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ij 8
0.05~0.27
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0.05~0.35
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If the mounting clearance is too large, the diameter of coarse pipe may be reduced to an appropriate value
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5.6.3 Installation of branch pipe
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of branch pipe is very important to the operation of multi-unit. Based on correct selection of branch pipe, the
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Connection schematics for Y-type branch pipe
The connection of Y-type branch pipe is as shown below. The inlet is connected to outdoor unit or previous branch; the outlet is
connected to indoor unit or next branch.
Pipe for Site Use
Pipe for Site Use
To other manifold pipe
or indoor unit
Inlet
Outlet 1
Y-Type Refnet pipe
Outlet 2
Outdoor Unit
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Placement of branch pipe
The branch pipe can only placed horizontally. Meanwhile, two branch pipes must be on the same plane.
The spacing between two branch pipes must be over 800mm, the spacing between two bends must be over
800mm, and the spacing between branch pipe and bend point must also be over 800mm.