110
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 0.5±0.1kgf/cm2.
Nitrogen flow can be sensed by hand.
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
The copper pipe shall be vertically inserted to the specified length. The centerline of two assemblies shall 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
φ6.35
6
0.05~0.21
φ9.52, φ12.7
7
φ15.8
8
0.05~0.27
φ19.05, φ22.2, φ25.4
10
φ28.6, φ31.8
12
0.05~0.35
≥φ35
14
If the mounting clearance is too large, the diameter of coarse pipe may be reduced to an appropriate value to
according to applicable specifications, if any.
5.6.3 Installation of branch pipe
The branch pipe plays the function to divert the refrigerant flow. Therefore, the selection and installation of branch
pipe is very important to the operation of multi-unit. Based on correct selection of branch pipe, the branch pipe must be
installed according to installation specifications.
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.
Site pipe
Site pipe
Outdoor unit
Inlet
Y-type Manifold Pipe
Outlet 2
Outlet 1
To other manifold
pipe or indoor unit
Installation specifications for branch pipe
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.
Содержание CN851W1000
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