Cutting The Refrigerant Piping / Brazing Procedure - LG MULTI V ARNH423K3A4 Installation Manual

INSTALLING THE REFRIGERANT PIPING

Cutting the Refrigerant Piping / Brazing Procedure

Cutting the Refrigerant Piping
Cut the pipe to length.
• Measure the distance between the indoor unit and the outdoor unit.
• Cut the pipes a little longer than measured distance.
Remove the burrs.
• Completely remove all burrs from pipe ends.
• When removing burrs, point the end of the copper pipe down to
avoid introducing foreign materials in the pipe.
Brazing Procedure
One of the main causes of refrigerant leaks is a defective connection. Hydro Kits have brazed connections.
WARNING
Do not braze in an enclosed location.
before and after brazing.
• During installation, it is imperative to keep the piping system free of contaminants and debris such as copper burrs, slag, or carbon dust.
•
1. 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.
WARNING
•
physical injury or death.
•
injury or death.
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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.
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1. Copper
tube
90°
Pipe
Reamer
Point
down
Figure 6: Refrigerant Pipe Brazing.
Refrigerant
Piping
Nitrogen
Slanted Uneven Rough
Pressure-reducing
Pipe to
Valve
be brazed
Valve
Taping