34
Outside Unit
◆
Outdoor Unit Connection
➲
Refrigerant pipe diameter before 1st branch (A,E,F)
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.
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 20 (58kW) outdoor unit to 130% of its system capacity 75.4kW and branching one
HR unit of four 7k indoor units (8.4kW) at the 1st branch.
Main pipe diameter(20 HP outdoor unit):
Ø
15.88(Liquid pipe),
Ø
28.58(Low pressure gas pipe),
Ø
22.2(High pressure gas pipe)
Pipe diameter between 1st and 2nd branch (67kW indoor units):
Ø
15.88(Liquid pipe),
Ø
28.58(Low pressure gas pipe) and
Ø
28.58(High pressure gas pipe) in conformity with downward
indoor units.
Since the main pipe diameter of 22HP outdoor unit is
Ø
15.88(Liquid pipe),
Ø
28.58(Low pressure gas pipe) ,
Ø
22.2(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.
Liquid pipe
8, 10 HP ...........................
Ø
9.52
→
Ø
12.7
20 HP ................................
Ø
12.7
→
Ø
15.88
30 HP ................................
Ø
15.88
→
Ø
19.05
40,50,60 HP .......................
Ø
19.05
→
Ø
22.2
Upward outdoor unit total capacity
[HP]
8,10
9.52 (3/8)
22.2 (7/8)
19.05 (3/4)
20
15.88 (5/8)
28.58 (1 1/8)
22.2 (7/8)
30
19.05 (3/4)
34.9 (1/ 3/8)
28.58 (1 1/8)
40, 50, 60
19.05 (3/4)
41.3 (1 5/8)
34.9 (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)
< 33(112,600)
Ø
6.35(1/4)
Ø
9.52(3/8)
Ø
9.52(3/8)
Ø
9.52(3/8)
Ø
12.7(1/2)
Ø
15.88(5/8)
Ø
19.05(3/4)
Ø
22.2(7/8)
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
