34
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
• * : Assume equivalent pipe length of Y branch to be 0.5m, that of header to be 1m, cal-
culation 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)
!
Outdoor unit capacity (HP)
2.5
3
4
5
6
T
Total pipe length (m)
50
80
85
100
100
A+B+C+a+b+c+d+e
L
Longest pipe length (m) (Equivalent pipe length)
30
40
50
50
50
A+B+C+D+e
l
Longest pipe length after 1st branch (m)
20
30
30
30
30
B+C+D+e
H
Difference in height (m) (Outdoor Unit
÷
Indoor Unit)
15
15
15
15
15
H
h
Difference in height (m) (Indoor Unit
÷
Indoor Unit)
7.5
7.5
7.5
7.5
7.5
h
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