Vertiv | Liebert PEX4 | User Manual 39
Installation
2.6.3. Copper Pipe Brazing Requirements
• In order to ensure safety in the connecting pipes and solder joints before brazing, it is necessary to clean the
air conditioning system with nitrogen to release the pressure from the system.
• The copper pipes should be thermally insulated. When the copper pipes pass through the wall or other
obstacles, it is recommended to use the shock absorber and other isolation measures to avoid direct contact
with the wall, as well as to prevent the entry of dust, water vapor, solid particles into the copper pipes.
• In order to ensure the quality of brazing, use high-quality silver-based solder welded pipe joints. The brazing
pipeline should be lled with nitrogen to protect the brazing process.
• The selection, placement and xation of piping; system vacuum and lling of refrigerant are required to
operate according to industry standards. The parameters such as pipeline pressure drop, compressor return
oil, noise reduction and vibration should be considered while designing and construction process.
• The copper pipe interface should be polished after brazing, the burr should be cleared and the inside of the
copper pipe should also be cleaned. Refer following cleaning methods.
1. The slender wire is wrapped in a cotton cloth dipped in the alcohol (or acetone), pulled back and froth into
the copper pipe. For specic operation, refer to the Figure 2-21.
Figure 2-21 Copper Pipe Cleaning Method
2. Nitrogen protection should be used in the brazing process and the edges of the copper pipes should be
sealed to prevent impurities and wet air from entering the copper pipe. For specic operation of the seal,
refer to Figure 2-22.
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