34 Outside Unit34 Outside Unit
Refrigerant piping system
➲ Refrigerant pipe diameter from branch to branch (B,C,D)
Downward Indoor Unit
total capacity(kW)
Liquid pipe(mm) Gas pipe(mm)
≤ 5.6
Ø 6.35 Ø 12.7
< 16.0 Ø 9.52 Ø 15.88
≤ 23.0
Ø 9.52 Ø 19.05
< 33.0 Ø 9.52 Ø 22.2
< 47.0 Ø 12.7 Ø 28.58
< 71.0 Ø 15.88 Ø 28.58
< 104.0 Ø 19.05 Ø 34.9
< 174.0 Ø 19.05 Ø 41.3
➲ Total pipe length limited
Classification
Section Type Y branch Y/header branch Header branch
Maximum
permitted
length
Outdoor unit
↔ indoor unit
Maximum pipe
length(L)
A+B+C+D+e
≤ 150 m
(Conditionally 200 m)*
A+B+b ≤ 150 m
A+C+e ≤ 150 m
(Conditionally 200m)*
A+f ≤ 150 m
Corresponding
pipe length
175 m
(Conditionally 225 m)*
175 m
(Conditionally 225 m)*
175 m
Total pipe length
(Outdoor unit ↔
total indoor unit)
300 m
(Conditionally 500 m)*
300 m
(Conditionally 500 m)*
300 m
(Conditionally 500 m)*
Permitted
height
Outdoor unit
↔ indoor unit
height
difference(H)
50 m 50 m 50 m
Indoor unit
↔ indoor unit
height
difference(h)
40 m 40 m 40 m
Maximum pipe
length after
1st branch
Actual pipe
length(l)
40 m
(Conditionally 90m)*
40 m
(Conditionally 90m)*
40 m
WARNING
• It is recommended that difference of piping length for pipes connected to the Indoor Unit is mini-
mized. Performance difference between Indoor Units may occur.
• When the any one (or both) of below conditions are satisfied, the diameter of main pipe (A) must be
increased according to below table.
- The equivalent length between outdoor unit and the farthest indoor unit is 90m or more
(Liquid and Gas pipes are increased)
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