Table of Contents
Advertisement
Brazing Procedure
Refrigerant Pipe Connections
Units include brazed connections only.
It is imperative to keep the piping system free of contaminants and debris such as copper burrs, slag, or carbon dust during installation.
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.
• Store pipe stock in a dry place; keep stored pipe capped and clean.
• Purge all pipe sections clean with dry nitrogen prior to assembly.
2. Proper system operation depends on the installer using best practices and the utmost care while assembling the piping system.
• Use adapters to assemble different sizes of pipe.
• Always use a non-oxidizing material for brazing.
used, oxidized film may accumulate and clog or damage the compressors. Flux can harm the copper piping or refrigerant oil.
• Use a tubing cutter;
do not use a saw to cut pipe. De-bur and
clean all cuts before assembly.
3. 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.
Pipe Support Location
A properly installed pipe system must have sufficient support so that
pipes will not sag during the life of the system. As necessary, place
supports closer for segments where potential sagging could occur.
Maximum spacing of pipe supports must meet local codes.
Figure 15: Pipe Support at Split Compact DOAS
Unit.
Insulate Refrigerant Pipes
Sufficiently insulate all cold surfaces to prevent moisture forming. All pipes must be insulated and each pipe must be separately wrapped.
Use field-provided one-half (1/2) inch thick (or thicker) closed-cell insulation. The thickness may need to be increased based on ambient
conditions and local codes.
Wrap all refrigerant piping including field-provided isolation ball valves and flexible pipe connection kits provided by LG. Glue all insulation
joints with no air gaps between insulation segments, and between insulation segments and the unit case. Ensure insulation material fits
snugly against the refrigeration pipe with no air space between the pipe surface and the surrounding insulation.
Protect insulation inside hangers and supports with a second insulation layer. Ensure insulation on all pipe passing through pipe hangers,
inside conduit, and/or sleeves is not compressed.
Brazing Procedure / Pipe Support Location / Insulate
Do not use flux, soft solder, or anti-oxidant agents. If the proper material is not
Figure 16: Typical Pipe Support Location—
Change in Pipe Direction.
~ 12" – 19"
Maximum 12"
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 14: Using Nitrogen Gas During Brazing
Max. 12"
~ 12" – 19"
UNIT PIPING
Figure 17: Pipe Support at Y-branch Fitting.
Max. 12"
Max. 12"
Max. 12"
27
Advertisement
Table of Contents
