Fujitsu Airstage J-II Series Design & Technical Manual page 591

„ CAUTION
„
z Brazing
„
While brazing the pipe, be sure to blow dry nitrogen gas through the pipes.
If not used, it will be caused to damage for compressor and clog the strainer and electronic
expansion valve.
Example) Inside state of brazing pipe section
Nitrogen gas used
Nitrogen gas used but not sufficient
(Oxygen gas still inside the pipe)
- (06 - 27) -
Nitrogen gas does not used