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Refrigerant pipe brazing and safety information
Important information for refrigerant pipe work
• Make sure there is no moisture inside the pipe.
• Make sure there are no foreign substances and impurities in the pipe.
• Make sure there is no leakage.
• Make sure to follow the instruction when welding or storing the pipe.
Caution
Nitrogen ushing brazing
Use Nitrogen gas when brazing the pipes as shown in the picture.
If you do not perform nitrogen flushing when brazing the pipes, oxide may form inside the pipe. It can cause the
damage of the important parts such as compressor and valves etc.
Adjust the ow rate of the Nitrogen ushing with a pressure regulator to maintain 0.05m
3
/h or less.
Brazing part
Nitrogen gas
Ø 6.35(1/4") copper pipe
Stop-off valve
Taping
High pressure hose
Pressure regulator
Nitrogen gas
Flow meter
Direction of the pipe when brazing
Brazing the pipe shold be done with the pipe headed downward or horizontally.
Avoid brazing with the pipe headed upward.
Installation of Air-conditioner
Caution
• The test liquid used to detect leakage after pipe brazing should be the designated one.The use of the test
liquid containing sulfur element may cause pipe corrosion.
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