Example : 5 indoor units
connected
: outdoor unit
: 1st branch
(branch union)
: indoor units
: downward
indoor unit
➲ Piping diameter (A)
- Liquid pipe : Ø12.7mm(1/2 inch)
- Gas pipe : Ø19.05mm(3/4 inch)
➲ Refrigerant pipe diameter from branch to branch (B,C,D)
➲ Total pipe length = A+B+C+D+a+b+c+d+e ≤ 100m
Downward indoor unit total capacity
[kW(Btu/h)]
~8.2(28,000)
~15.0(51,000)
Ø9.52
Ø12.7
Ø15.88
Ø19.05
Liquid pipe
(mm)
Gas pipe
(mm)
Longest pipe length
A+B+C+D+e ≤ 70m
Longest pipe length after 1st branch
B+C+D+e ≤ 30m
Difference in height(outdoor ↔ indoor)
H ≤ 30m ( 20m : outdoor is lower than indoor units)
Difference in height (indoor ↔ indoor)
h ≤ 12m
L
l
H
h
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