DC Inverter Multi
VRF Service Manual
113
melted to cause leakage.
For example:
Weld the pipe approx. 1m before and behind
the reflared position, and wrap with thernal
insulation materials. Then, weld on higher position.
Approx. 1m
Approx. 1m
i. To avoid the position difcult to weld, you may add a prefabricated assembly below.
Drainage pipe
Difficult to weld
at this position
5.7.4 Operation order
Basic procedures for welding:
Assemble copper pipes
Cleaning
Check whether
clearance is proper.
Fill nitrogen
2
N
( )
Itrogen pressure 0.05~0.3Mpa
Welding flux
Acknowledge
welding flux
Welding heating
Add welding flux
Cooling, continue to fill
nitrogen for over 10s
Shut off nitrogen
Make visual inspection
to the weld quality
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