10
GB
5. Connecting refrigerant pipes and drain pipes
5.1. Pipe connecting method
Brazing
Caution:
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- Failure to do so may result in burnout or malfunction.
When connecting pipes, satisfy the minimum insertion depth requirement for copper pipe joint, and the gap between the pipe outer wall and the joint inner wall as follows.
(Unit: mm)
B
D
A
Pipe size (D)
Minimum insertion depth (B)
Gap (A–D)
5 or more, less than 8
6
0.05 to 0.35
8 or more, less than 12
7
12 or more, less than 16
8
0.05 to 0.45
16 or more, less than 25
10
25 or more, less than 35
12
0.05 to 0.55
35 or more, less than 45
14
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Procedures
(1)
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(2)
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(After brazing, keep supplying a
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section is cooled down to 200ºC or
lower.)
N
2
Cylinder
Stuff something in the pipe to keep air from enter-
ing the pipe.
Brazed section
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Example of brazing pipes under nitrogen purge
Notes:
Keep the heated area to a minimum and braze the pipes at the appropriate temperature.
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After brazing pipes, do not splash water on the pipes to cool them down.
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Make sure to check the components of the antioxidant before use. The components must not corrode the pipes if mixed with the refrigerant or refrigerant
oil.
