Indoor Unit Connections - LG LV120HCV Installation Manual

REFRIGERANT PIPING CONNECTIONS

Indoor Unit Connections

Piping to Indoor Unit
Follow the steps below and refer to the illustrations on this page to connect piping to the Single Zone indoor unit. To see specific bundling
of piping and drain hose, see the Bundling and Cutting Line section. Also, refer to the Drain Hose Guidelines section on the next page for
proper drainage slope during piping procedure. Also refer to the General Piping information in Section 3.
Do not braze in an enclosed location.
refrigerant to leak during brazing. Always test for gas leaks before
and after brazing.
If the refrigerant combusts, it generates a toxic gas that may cause physical
injury or death.
1. Joints are brazed in the field. Single Zone refrigeration system
components contain very small capillary tubes, small orifices, elec-
tronic 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. Purge clean all pipe sections with dry nitrogen prior to assembly.
4. Always use a non-oxidizing material for brazing.
flux, soft solder, or anti-oxidant agents. If the proper material is not
used, oxidized film may accumulate and clog or damage the com-
pressors. Flux can harm the copper piping or refrigerant oil.
5. Use a tubing cutter, do not use a saw to cut pipe. De-bur and
clean all cuts before assembly.
6. 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.
38
Do not allow the
Do not use
Due to our policy of continuous product innovation, some specifications may change without notification.
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Figure 42: VAHU Refrigerant Pipe Brazed Connections.
Liquid Pipe
Vapor Pipe
Figure 43: Refrigerant Pipe Brazing.
Welding Point
Oxide scale
Do not block the outlet side
Regulator
Nitrogen gas
Pressure 3 psig
Auxiliary valve
Tape