MCAC-VTSM-2015-09 R410A All DC Inverter V4+S Series 60Hz
Installation 103
nitrogen
brazing welding part
assistant pipe assemblycopper pipe direct connection
brazing welding part
copper pipe elbows
assistant pipe assembly
nitrogen
5. Standard brazing operation
copper pipe 1/4"
copper pipe fittings
copper pipe
nitrogen gas cylinder
hign pressure flexible pipe
decompress valvevalve
nitrogen charging connecting fitting
brazing weld part
oxygen nitrogen
Attention:
1) Maintain the nitrogen pressure at around 0.2-0.3kgf/cm² during the welding.
2) Ensure the gas is nitrogen other than oxygen, oxygen will easily leads explosion, so it is forbidden.
3) Use a pressure reducing valve, and maintain the nitrogen pressure at around 0.2kg/ cm².
4) Select a proper position for charging nitrogen.
5) Ensure that the nitrogen passes through the welding spots.
6) If the pipe between the position for charging nitrogen and the welding spot is long, ensure that the nitrogen
is charged for sufficient time so as to discharge all the air from the welding area.
7) After completing the welding, charge the nitrogen continuously until the pipe cools down completely.
8) Try best to conduct welding downwards or horizontally and avoid face-down welding.
A
D
down up
brazing
welding
brazing
welding
brazing
welding
√ √
△
6. Cautions
1) Take fire-prevention measures when conducting welding (ensure that a fire extinguisher is available near
the operating area).
2) Avoid getting burnt.
3) Pay attention to the fit gap of the position where the pipe is inserted.
Note: The following table shows the relation between the minimum embedded depth and gap at the copper
pipe joint.
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