McQuay MDS080BR Installation Guide Page 83

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Design & installation Guide For McQuay MDS Multi System
4.3.3 Exchange Way of Nitrogen Gas (When Welding Copper Tube)
Suppose no nitrogen gas is injected into refrigerant pipe when welding, the oxide air bubble will
come into being in the internal surface of tube. This will result in some damage to the system. In
order to avoid these, nitrogen gas should be injected into refrigerant pipe when welding, this
process is called nitrogen gas exchange method. This is the standard operation process of
welding.
Note:
The gas must be Nitrogen.
Pressure adjustor must be used.
Pressure adjustor
Copper
unit's connecting pipe
Nitrogen bottle
High pressure pipe
Non-hermetic valve
Binding belt welding area
Pipe
Pressure adjustor
Nitrogen bottle
Pipe
Outdoor unit
Non-hermetic valve
Moisture
Dust
Air
leakage
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