Piping
39 Liebert
®
SRC™ User Manual
5.2.1 Brazing Practices
All joints are brazed in the field. Refrigeration-system components contain very small capillary tubes, small
orifices, electronic expansion valves, oil separators, and heat exchangers that can easily become blocked.
Proper system operation depends on the installer using best practices and utmost care while assembling
the piping system.
Figure 5-5 Refrigerant-pipe brazing
• While brazing, use a dry-nitrogen purge operating at a minimum pressure of 3 psig and maintain a
steady flow.
• Before assembly, use dry nitrogen to blow clean all pipe sections.
• Use a tubing cutter, do not use a saw to cut pipe. De-burr and clean all cuts before assembly.
• Store pipe stock in a dry place. Keep pipe capped and clean.
• Use adapters to assemble different sizes of pipe.
• Do not use flux, soft solder, or anti-oxidant agents.
• Use a 15% silver phosphorous copper-brazing alloy to avoid overheating and produce good flow.
• Protect isolation valves, electronic expansion valves, and other heat-sensitive control components
from excessive heat with a wet rag or a heat-barrier spray product.
NOTE
It is imperative to keep the piping system free of contaminants and debris
such as copper burrs, slag, or carbon dust during installation. Contaminants
can result in mechanical failure of the system.
Pressure-reducing
Valve
Valve
Taping
Nitrogen
Pipe to
be brazed
Refrigerant
Piping
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