Toshiba HWS-802XWHM3-E Service Manual page 15

5) Use the reducing valve to adjust the nitrogen
gas flow speed to 0.05 m
2
(0.2 kgf/cm ).
6) After the steps above, keep the nitrogen gas
flowing until the pipe cools down to a certain
extent. (Temperature where the pipe is cool
enough to be touched by hands)
7) Remove the flux completely after brazing.
Fig 2-5-1
Prevention of oxidation during brazing
Flow meter
M
Stop valve
Nitrogen gas cylinder
Pipe
3
/hour or 0.02 MPa
From nitrogen cylinder
Nitrogen gas
Robber plug
14