37
Installation Manual
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.
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 exchang-
ers 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.
Do not use flux, soft solder, or anti-oxidant agents. If the proper material is not used,
oxidized film may 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.
Figure 26: Refrigerant Pipe Brazing.
Pressure-reducing
Valve
Valve
Taping
Nitrogen
Pipe to
be brazed
Refrigerant
Piping
Brazing Procedure
Do not braze in an enclosed location. Do not allow the refrigerant to leak during brazing. Always test for gas leaks
before and after brazing.
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REFRIGERANT PIPING
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