Gree GMV-PD100W/NAB-K, Service Manual

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DC Inverter Multi
VRF Service Manual
5.4.2 Fixing of vertical pipe
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5.4.3 Fixing of other points
Measures shall be taken to prevent the extension or shrinkage of pipes from causing excessive loads to
some positions, machine joint and waterproof points. Generally, such positions refer to the branch pipe joint,
pipe ends, four sides of indoor unit and wall-cross hole.
5.5 Management and Machining of Refrigerant Piping
5.5.1 Storage
After receiving the refrigerant pipe and other components, do not move them to the storage until
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The pipe end must be sealed to prevent the invasion of moisture or wastes.
The copper pipe with coating may become deformed under the compression of the coating material, so
that the coils shall be placed upright.
To avoid the invasion of moisture or wastes, a support higher than the ground must be built by using
woods.
Care of pipe end during construction
The pipe ends must be well cared during construction. According to the working position, work progress
and surrounding environment, the most effective way is to seal the end and wrap with adhesive tape.
1) Sealing method
Clamp the pipe end and weld on it.
Clamp the pipe end to flat and weld on the clearance. Then, charge nitrogen 2~5kgf/cm2. This will be
more effective.
2) Method for wrapping with adhesive tape
Seal the pipe end with ethylene tape.
5.5.2 Unwinding the coil
CAUTION
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When unwinding the coil, take care not to drag it on the ground. The coil shall be slowly unwound
on ground without any twisting. In case of excessive compression by any hard object during unwinding,
the thermal insulation materials may be damaged and cannot be recovered, which will deteriorate
the performance of thermal insulation. Do not unwind carelessly. Otherwise, the fitting pipe might be
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The copper pipe shall be rounded if the pipe end is deformed
The higher the size, the higher the possible deformation.