36 Outdoor Unit
Refrigerant piping installation
WARNING
When the equivalent length between the outdoor unit and a indoor unit is 90 m or more, the size of main
pipes (only liquid pipe) must be increased one grade.
◆ Outdoor Unit Connection
WARNING
Do not choose the main pipe diameter, namely A, by downward indoor unit total capacity but its outdoor unit model name.
Do not let the connection pipe from branch to branch exceed the main pipe diameter chosen by outdoor unit model name.
EX) Where connecting the indoor units to the 22 HP (61.5 kW) outdoor unit to 130% of its system capacity (79.9 kW) and
branching one HR unit of four 7k indoor units (8.4kW) at the 1st branch.
Main pipe diameter(22 HP outdoor unit): Ø15.88(Liquid pipe), Ø34.9(Low pressure gas pipe), Ø28.58(High pressure gas pipe)
Pipe diameter between 1st and 2nd branch (71.5kW indoor units): Ø19.05(Liquid pipe), Ø34.9(Low pressure gas pipe) and
Ø28.58(High pressure gas pipe) in conformity with downward
indoor units.
Since the main pipe diameter of 22HP outdoor unit is Ø15.88(Liquid pipe), Ø34.9(Low pressure gas pipe) , Ø28.58(High pressure gas
pipe), it should be used as the diameter of the main pipe and the connection pipe between 1st and 2nd indoor branches.
➲ Refrigerant pipe diameter before 1st branch (A,E,F)
Liquid pipe
8, 10HP..........................................Ø9.52 → Ø12.7
12, 14, 16HP..................................Ø12.7 → Ø15.88
18, 20, 22, 24HP............................Ø15.88 → Ø19.05
26, 28, 30, 32, 34, 36, 38, 40HP....Ø19.05 → Ø22.2
Upward outdoor unit total capacity
[HP]
8 Ø9.52(3/8) Ø19.05(3/4) Ø15.88(5/8)
10 Ø9.52(3/8) Ø22.2(7/8) Ø19.05(3/4)
12 Ø12.7(1/2) Ø28.58(1
1
/8) Ø19.05(3/4)
14, 16 Ø12.7(1/2) Ø28.58(1
1
/8) Ø22.2(7/8)
18, 20 Ø15.88(5/8) Ø28.58(1
1
/8) Ø22.2(7/8)
22, 24 Ø15.88(5/8) Ø34.9(1
3
/8) Ø28.58(1
1
/8)
26~34 Ø19.05(3/4) Ø34.9(1
3
/8) Ø28.58(1
1
/8)
36 Ø19.05(3/4) Ø41.3(1
5
/8) Ø28.58(1
1
/8)
38, 40 Ø19.05(3/4) Ø41.3(1
5
/8) Ø34.9(1
3
/8)
Liquid pipe
[mm(inch)]
Low pressure High pressure
Gas pipe [mm(inch)]
◆ Indoor Unit Connection
➲ Indoor unit connecting pipe from branch (a~k)
Indoor unit capacity [kW(Btu/h)]
< 5.6(19,100)
< 16.0(54,600)
< 22.4(76,400)
Ø6.35(1/4 inch)
Ø9.52(3/8 inch)
Ø9.52(3/8 inch)
Ø12.7(1/2 inch)
Ø15.88(5/8 inch)
Ø19.05(3/4 inch)
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
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