Daikin VRV REYQ96MTJU Design, Installation & Testing Instruction page 27

Si39-406
Method for If brazing work is carried out without passing nitrogen gas through the pipes which are being
brazed then this allows the formation of oxidation bubbles on the inside surface of the pipes. These
Replacing
oxidation bubbles are then carried along inside the pipes to cause damage to various members of
Nitrogen
the system such as valves or compressors and the system ceases to function properly.
(Brazing)
In order to avoid this problem nitrogen is passed through the pipes while the soldering work is
being carried out. This operation is known as nitrogen replacement. (Air is replaced by nitrogen)
This is standard work practice for all brazing work.
Important points:
1. The gas used must be nitrogen (oxygen, carbon dioxide and flon should not be used.)
2. A pressure regulator must be used.
General Information
Installation
21