Daikin RXQ34PY1 [29/355] Method for replacing nitrogen brazing

Daikin RXQ12PY1 [29/355] Method for replacing nitrogen brazing
SiEN34-705 Installation
General Information 23
Method for
Replacing
Nitrogen
(Brazing)
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 oxidation bubbles are then carried along inside the pipes to cause damage to various
members of the system such as valves or compressors and the system ceases to function
properly.
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.
Brazing section
Nitrogen
Taping
Presure regulator
Copper pipe 1 / 4
Packless valve
High pressure hose
Nitrogen cylinder
Outdoor unit
Packless valve
Pipe
Hose
Pressure
regulator
Nitrogen cylinder

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