32
Outdoor Unit
Refrigerant piping installation
Longest pipe length
Equivalent pipe length
A+B+C+D+e
≤
150m
* A+B+C+D+e
≤
175m
Longest pipe length after 1st branch
B+C+D+e
≤
40m
Difference in height(outdoor unit
↔
indoor unit)
H
≤
50m ( 40m : outdoor unit is lower than indoor units)
Difference in height (indoor unit
↔
indoor unit)
h
≤
15m
L
l
H
h
➲
Refrigerant pipe diameter from branch to branch (B,C,D)
➲
Total pipe length = A+B+C+D+a+b+c+d+e
≤
300m
Downward indoor unit total capacity
[kW(Btu/h)]
<5.6(19,100)
Ø6.35(1/4)
Ø12.7(1/2)
<16(54,600)
Ø9.52(3/8)
Ø15.88(5/8)
<22.4(76,400)
Ø9.52(3/8)
Ø19.05(3/4)
< 33(112,600)
Ø9.52(3/8)
Ø22.2(7/8)
< 47(160,400)
Ø12.7(1/2)
Ø28.58(1
1
/
8
)
< 71(242,300)
Ø15.88(5/8)
Ø28.58(1
1
/
8
)
< 104(354,900)
Ø19.05(3/4)
Ø34.9(1
3
/
8
)
104(354,900)
≤
Ø19.05(3/4)
Ø41.3(1
5
/
8
)
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
CAUTION
• * : Assume equivalent piping length of Y branch to be 0.5m, that of header to be 1m, calculation purpose.