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27
Installing the Refrigerant Piping
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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.
90°
Slanted Uneven Rough
Pipe
Reamer
Point
down
1.
Copper
tube
• During installation, it is imperative to keep the piping system free of contaminants and debris such as copper burrs, slag, or carbon dust.
•
Do not use kinked pipe caused by excessive bending in one specific area on its length.
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.
Do not use flux, soft solder, or anti-oxidant agents. If the proper material is not used,
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.
Figure 6: Refrigerant Pipe Brazing.
Pressure-reducing
Valve
Valve
Taping
Nitrogen
Pipe to
be brazed
Refrigerant
Piping
Brazing Procedure
One of the main causes of refrigerant leaks is a defective connection. Hydro Kits have brazed connections.
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.
If the refrigerant combusts, it generates a toxic gas the will cause physical injury or death.
WARNING
•
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physical injury or death.
•
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injury or death.
WARNING