DC INVERTER MULTI VRF INSTALLATION
142
6.5 Management and Machining of Refrigerant Piping
1
）Storage
After receiving the refrigerant pipe and other components, do not move them to the storage until
confirming that they have no deformation, bend, crack or damage.
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.
Sealing method
Clamp the pipe end to flat and weld on the clearance. Then, charge nitrogen 2～
5kgf/cm
2
. This will be more effective.
Method for wrapping with adhesive tape
Seal the pipe end with ethylene tape.
2
）Coil unwinding
CAUTION:
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 flattened.
The copper pipe shall be rounded if the pipe end is deformed.
(The higher the size, the higher the possible deformation)
3
）Measuring of pipe
(To reduce the resistance and length of copper pipe), the dimension of main refrigerant pipe shall
be so taken that the bends shall be minimized, the radius of bend section shall be increased and
the upstream and downstream section shall be reduced. Use the method that can reduce the
actual length and equivalent length of the copper pipe.
Sometimes the connection pipe of indoor unit must be adjusted due to the relation with
accessories, drainage hose and connection surface. Therefore, a fairly marginal dimension
shall be taken.
Clamp the pipe end and weld on it.
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