60
page
Service Manual
5KK14BEA2AA00 / 5KK21BGA2AA00 / 5KK30BGA2AA00
3) Cleaning brazing fi ller metal and piping
• When the refrigerant system has been opened, exposure to heat may cause the
brazing fi ller metal to s ck to the inside and outside of the piping. Brazing fi ller
metal may also combine with oxygen in the air to form an oxide fi lm. In addi on,
grease and oils may s ck to the pipe during handling. All these factors will reduce
the eff ec veness of brazing. Therefore, excess brazing fi ller metal must be removed
with sand paper, and by thorough cleaning with a solvent such as Trichlene.
4) Dry Nitrogen gas use
• During brazing, the inside of the pipe undergoes an oxida ve reac on due to the
brazing fl ame. Introduce dry nitrogen gas (0.3 gal/min (1 L/min); adjust with the
fl ow regulator) through the pinch-off tube of the refrigerant cycle to prevent oxi-
da on.
NOTE
:Do not get foreign ma er such as dirt, water, or oil into the piping.
5) Ver cal joints
• For ver cal joints, heat the en re brazed fi
ng to the proper brazing temperature.
Bring the brazing fi ller metal into contact with the fi
ng so that the brazing fi ller
metal begins to fl ow.
• Stop hea ng the fi
ng as soon as the braz-
ing fi ller metal has fl own into the gap (clear-
ance). Since the brazing fi ller metal fl ows
easily into por ons heated to the proper
temperature, the en re fi
ng must be kept
at the proper brazing temperature.
Burner
45°
Tube
Brazing Filler Metal
Vercal Down Joint
Tube
Burner
45°
Brazing Filler Metal
Vercal Up Joint