3-3. Pipe connection
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Precautions for connecting simultaneous operation multi
CAUTION
• Use genuine branch pipes for the refrigerant piping branches. Branch pipes are twin or triple
type for simultaneous operation, and may be used for piping between the outdoor and indoor
units.
• Select a twin or triple type branch pipe and purchase it before starting the installation work.
• Shorten the length of branch pipes from a branch to indoor unit as short as possible.
Maximum length: 20 m or less
• Branch pipes shall be connected by welding (brazing).
• Any vertical piping shall be in the part of the main piping. If a main pipe is bent, keep the straight
part more than 10 times the diameter of the connected pipe. A variance in the amount of refrig-
erant may be caused if the straight part is short.
• For details, refer to the Installation manual of branch pipes.
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Bending pipes
CAUTION
• To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curvature of
100 mm to 150 mm.
• If the pipes are bent or stretched repeatedly at the same place, the material will harden making
it difficult to bend or stretch them any more.
• Do not bend or stretch the pipes more than three times, otherwise it will be break.
NOTES:
• If pipes are shaped by hand, be careful not to collapse them.
• Do not bend the pipes at an angle of more than 90°.
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3-3. Pipe connection 3. Pipe installation
SYSTEM
DESIGN
SYSTEM
DESIGN
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