No.
Piping parts Name Selection of pipe size
①
Outdoor unit
↓
1st branching section
Main pipe
Size of main pipe
②
Branching section
↓
Branching section
Branching pipe
Pipe size of between branching sections
③
Branching section
↓
Indoor unit
Indoor unit
connecting pipe
Connecting pipe size of indoor unit
Outdoor unit
capacity[HP]
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
2.5 Ø9.52(3/8) Ø15.88(5/8)
3 Ø9.52(3/8) Ø15.88(5/8)
4 Ø9.52(3/8) Ø15.88(5/8)
5 Ø9.52(3/8) Ø15.88(5/8)
6 Ø9.52(3/8) Ø19.05(7/8))
Indoor unit
capacity[kW(Btu/h)]
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
≤ 5.6(19,100)
Ø6.35(1/4) Ø12.7(1/2)
< 16.0(54,600) Ø9.52(3/8) Ø15.88(5/8)
< 22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)
< 36.4(124,200) Ø9.52(3/8) Ø22.2(7/8)
Indoor unit
capacity[kW(Btu/h)]
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
≤ 5.6(19,100)
Ø6.35(1/4) Ø12.7(1/2)
< 16.0(54,600) Ø9.52(3/8) Ø15.88(5/8)
≤ 22.4(76,400)
Ø9.52(3/8) Ø19.05(3/4)
≤ 28.0(95,900)
Ø9.52(3/8) Ø22.2(7/8)