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q Individual flow division method
● For determination of appropriate branching joint or different diameter pipe joint sizes, please refer to "Branching Pipe
Set," (which can be purchased separately).
Attention
● Please use pipes of the pipe size specified for the outdoor unit for the section between the outdoor unit and the first
branching joint.
● An appropriate pipe size between branching joints can vary depending on the connected indoor unit capacity
(total capacity connected downstream), please select an appropriate pipe size from the table shown on the right.
● The pipe size between the branch pipe and the indoor unit should
match that of the indoor unit.
● Always install branch pipes either horizontally or vertically.
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Horizontal
Floor surface
Floor surface
Floor surface
Vertical
Floor surface
w Header Method
● Depending on the number of units connected, connect blind pipes to header branching points (on the indoor unit
connection side).
● For determination of appropriate header, different diameter pipe joint and blind pipe sizes, please refer to "Header
Set," (which can be purchased separately).
Attention
● For the section between an indoor unit and the header, use a pipe of the diameter specified for the indoor unit.
● To couple with the header, use a different diameter pipe joint to adjust to the pipe diameter specified for the indoor unit.
● The header must be so installed that it branches horizontally (for both gas and liquid)
Floor surface
Floor surface
Floor surface
Liquid side
Horizontal
Horizontal
Horizontal
Floor surface
Floor surface
Gas side
Floor surface
Unit piping specifications
The piping material should be phosphorus deoxidized copper seamless steel pipes. (C1220T, JIS H3300)
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Attention
● Always select pipes meeting the minimum wall thickness requirement.
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