Gree GMV-PD140W/NAB-K

69
DC Inverter Multi
VRF Service Manual
5.5.3 Measuring
(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 pipe and connection surface. Therefore, a fairly marginal dimension shall be taken.
It is convenient
to adjust.
5.5.4 Cut·Chamfer
Cut
a. Cut vertically to axis direction by using special pipe cutter that is suitable to the dimension of
copper pipe (big, medium, small).
b. During operation, press and rotate the pipe cutter slowly and cut off the copper pipe without
causing any deformation.
Never use saw or grinding wheel, because the copper scraps may be left inside the pipe. Even use of
such tools once will make all works scrapped. It is useless no matter how good the quality of other works. It is
best that all operators shall have one pipe cutter and at least one pipe cutter of big dimension shall be provided
on site.
CAUTION
To prevent the invasion of water or waste, avoid placing the copper pipe directly on ground.
Chamfer
Burrs may occur on the cutting face of copper pipe and must be removed. Meanwhile, purge the foreign
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(To prevent copper scraps from falling into the pipe, please keep the pipe end downward during operation).
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Adverse impact if the burrs are removed too much with scraper.