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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 1 m,
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 90 m or more
(Liquid and Gas pipes are increased)
L 150 m
Branch pipe can not be used after header
Equivalent pipe length(*)
A+B+b ≤ 175 m
40 m
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