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Mechanical Installation 25
2.8.4. Connecting Refrigerant Piping
When connecting the refrigerant pipeline, the following requirements must be strictly observed:
1. Before brazing all the copper pipes, release the air present in the piping by opening each ball valves at least for 15min to
avoid absorption of moisture with the compressor’s lubricating oil.
2. All refrigeration pipe joints must be silver brazed;
3. During pipe brazing, if necessary pipe support fixture is required, fill the pipe with nitrogen, preventing excessive
oxidation during brazing and forming an oxide film on the inner wall of the pipe.
4. Ensure a certain inclination when installing the pipeline.
5. When installing the branch manifold, ensure that the branch piping are in horizontal, as shown in
Figure 2-18 ;
6. Corresponding labels are affixed to the pipe joints. Avoid burning the labels when brazing;
ITEMS DESCRIPTION ITEMS DESCRIPTION
1 Suction distributor 2 Liquid distributor
Figure 2-18 Horizontal Placement of Branch Manifold
When brazing, fill the refrigerant piping with nitrogen to prevent the formation of the oxide scaling due
to brazing process that may damage the compressor.