36
PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
ENGLISH
Example : 5 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Header
Ⓕ : Sealed piping
L 150m
40m
H 50m
Branch pipe can not be used after header
Combination of Y branch/header method
Total pipe length = A+B+C+a+b+c+d+e ≤ 300m
L
Longest pipe length Equivalent pipe length(*)
A+B+b ≤ 150m A+B+b ≤ 175m
l
Longest pipe length after 1st branch
B+b ≤ 40m
H
Difference in height (Outdoor Unit ↔ Indoor Unit)
H ≤ 50m (40m : Outdoor Unit is lower than Indoor Units)
h
Difference in height (Indoor Unit ↔ Indoor Unit)
h ≤ 15m
• * : Assume equivalent pipe length of Y branch to be 0.5m, 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)
!
1,MFL67798020, 2018. 4. 26. 7:06 Page 36
www.lgcomfortcooling.co.uk
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