26
Refrigerant piping
The maximum length of the connection pipes between
the branch joint and the furthest indoor unit must not
exceed 20m.
L
1
L
2
N
1
N
2
N
3
N
5
N
6
N
4
L
3
L
4
L
5
a
A
B
D
E
C
b
c
e
f
d
Fig. 34
l
WARNING
The length of each branch joint is 0.5m.
The indoor units should be as similar as
possible to permit installation of the branch
joint on both sides.
m
CAUTION
The length of the piping between the furthest
indoor unit and the first internal branch joint
must not exceed 20m.
l
WARNING
There must be at least 0.5 m of piping after a
bend and before a branch.
l
WARNING
The linear distance between adjacent branch
pipes must be at least 0.5 m;
l
WARNING
The linear distance between the branch pipes
and the indoor unit must be at least 0.5 m;
l
WARNING
The branch manifold must be connected
directly to the indoor units, no additional
branch is permitted.
– Each internal auxiliary pipe must not be more than
15m away from the internal branch joint (e.g. L and
f)
– The dierence in length between the internal
main pipe (e.g. L) from the first internal branch
joint (e.g. A) of the furthest indoor unit (e.g. N) and
the internal main pipe (e.g. L) of the first internal
branch joint (e.g. A) of the nearest indoor unit (e.g.
N) does not exceed 20m.
L
1
L
2
N
1
N
2
N
3
N
5
N
6
N
4
L
3
L
4
L
5
a
A
B
D
E
C
b
c
e
f
d
Fig. 35
.
a
CAUTION
If you exceed 20m, increase the diameter of
the internal main pipes by one size.
Perform this operation only for pipes that are
smaller than the main pipe.
Choice of branch joint
Select the type of branch joint according to the total
capacity of the indoor units to be connected.
If this capacity is higher than that of the outdoor unit,
choose the connection according to the outdoor unit.
The choice of the branch joint depends on the number of
branches to be connected.
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