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MULTI V Water IV
8. Refrigerant Piping System
Refrigerant pipe diameter from branch to branch (B,C,D)
Downward Indoor Unit total capacity
[kW(Btu/h)]
5.6(19,100)
< 16.0(54,600)
< 22.4(76,400)
< 33.6(114,700)
< 50.4(172,000)
< 67.2(229,300)
< 72.8(248,400)
< 100.8(344,000)
< 173.6(592,500)
< 184.8(630,700)
291.2(993,600)
Total pipe length limited
Classification
Section
Maximum
Outside Unit
permitted
indoor unit
length
Outside Unit
indoor unit
Permitted
height
Indoor unit
indoor unit
Maximum pipe
length after 1st
branch
WARNING
•
It is recommended that difference of piping length for pipes connected to the Indoor Unit is minimized.
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 outside unit and the farthest indoor unit is 90m or more (Liquid and Gas pipes
are increased)
22
Heat Pump
Liquid pipe
Ø15.88(5/8)
Ø15.88(5/8)
Ø19.05(3/4)
Ø19.05(3/4)
Type
Maximum pipe
length(L)
(Conditionally 200 m)*
Corresponding pipe
length
(Conditionally 225 m)*
Total pipe length
(Outside Unit
total
(Conditionally 500 m)*
indoor unit)
height difference(H)
height difference(h)
Actual pipe
length( )
(Conditionally 90m)*
[mm(inch)]
Ø6.35(1/4)
Ø9.52(3/8)
Ø9.52(3/8)
Ø9.52(3/8)
Ø12.7(1/2)
Ø22.2(7/8)
Ø22.2(7/8)
Y branch
Y/header branch
A+B+C+D+e
A+B+b
150 m
A+C+e
(Conditionally 200m)*
175 m
(Conditionally 225 m)*
300 m
(Conditionally 500 m)*
50 m
40 m
40 m
(Conditionally 90m)*
Installation of Outside Units
Gas pipe
[mm(inch)]
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
Ø28.58(1-1/8)
Ø28.58(1-1/8)
Ø34.9(1-3/8)
Ø34.9(1-3/8)
Ø41.3(1-5/8)
Ø44.5(1-3/4)
Ø53.98(2-1/8)
Header branch
150 m
A+f
150 m
150 m
175 m
175 m
300 m
300 m
(Conditionally 500 m)*
50 m
50 m
40 m
40 m
40 m
40 m
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