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PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
36
Combination of Y branch/header method
Example : 5 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Header
Ⓕ : Sealed piping
Total pipe length = A+B+C+a+b+c+d+e ≤ 300 m
Longest pipe length
L
A+B+b ≤ 150 m
Longest pipe length after 1st branch
B+b ≤ 40 m
Difference in height (Outdoor Unit ÷ Indoor Unit)
H
H ≤ 50 m (40 m : Outdoor Unit is lower than Indoor Units)
Difference in height (Indoor Unit ÷ Indoor Unit)
h
h ≤ 15 m
• * : Assume equivalent pipe length of Y branch to be 0.5 m, that of header to be 1m,
calculation purpose
• Indoor Unit should be installed at lower position than the header.
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 outdoor unit and the farthest indoor unit is 90m or more
(Liquid and Gas pipes are increased)
Branch pipe can not be used after header
Equivalent pipe length(*)
A+B+b ≤ 175 m
L 150 m
40 m
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