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GENERAL REFRIGERANT PIPING SYSTEM
Brazing Procedures
Brazing Procedure
Do not braze in an enclosed location.
before and after brazing.
If the refrigerant combusts, it generates a toxic gas the will cause physical injury or death.
Braze the pipes to the service valve pipe stub of the outdoor unit.
1. All joints are brazed in the field. Multi V 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.
2. Store pipe stock in a dry place; keep stored pipe capped and clean.
3. Blow clean all pipe sections with dry nitrogen prior to assembly.
4. Use adapters to assemble different sizes of pipe.
5. Always use a non-oxidizing material for brazing.
oxidized film will accumulate and clog or damage the compressors. Flux can harm the copper piping or refrigerant oil.
6. Use a tubing cutter,
do not use a saw to cut pipe. De-bur and clean all cuts before assembly.
7. Brazing joints:
• Use a dry nitrogen purge operating at a minimum pressure of three (3) psig and maintain a steady flow.
• 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
heat barrier spray.
32
Do not allow the refrigerant to leak during brazing. Always test for gas leaks
Do not use flux, soft solder, or anti-oxidant agents. If the proper material is not used,
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Figure 17: Refrigerant Pipe Brazing.
Refrigerant
Piping
Pipe to
be brazed
Nitrogen
Taping
Pressure-reducing
Valve
Valve
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