DC Inverter Multi
VRF Service Manual
107
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 articles out
of the pipe and renish the pipe end.
● Use scraper or other tools to remove the burrs on inner side.
(To prevent copper scraps from falling into the pipe, please keep the pipe end downward during operation).
● If the pipe end is obviously deformed, please cut and throw it off, and then renish the pipe end.
● Eliminate the copper scraps thoroughly, and use cotton yarn to wipe the pipe clean.
The ared joint must be kept smooth.
When removing the burrs with scraper, do not remove too much, especially for the tting pipe of small diameter;
otherwise the contact surface of the ared joint will be reduced. Do not cause any scores, and avoid cracking after the
ared joint is formed.
Adverse impact if the burrs are removed too much with scraper.
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