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The maximum number of indoor units that can be connected is 48. (When only one W Multi outdoor unit is in-
stalled, the maximum number of indoor units that can be connected is 24.)
The capacities that can be connected to the indoor units are 50 - 130%. (When connecting indoor units in a W
Multi system, connect capacities of at least 50% the smallest outdoor unit capacity, and 130% or below the total
outdoor unit capacity.) When only one W Multi outdoor unit is installed, the capacities that can be con-
nected to the indoor units are 50 - 200%. For a "G-Power" unit, however, the capacities that can be con-
nected are 50 - 130%.
L5
H3
Balance tube
ℓB
ℓA
No. 1 branch
Symbols
Branch tube
(APR purchased separately)
Ball valve (provided by installer)
T-tee (provided by installer)
Closed (pinch) weld
: Branch tube (purchased separately)
Indoor
Outdoor
Indoor
Indoor
Fig. 4 Level Use
1.
LM: Main tube with largest tubing diameter (includes LA and all post-branch main tubes that are
identical in size to LA) ≤ 120 m.
2.
Select the sizes for post-branching main tubes after LM (LB, LC, ...) based on the post-branching
capacity.
3.
The sizes for the indoor unit connection tubing (ℓ1 to ℓ48) depend on the tubing diameter for the
indoor unit.
LM
LB
LC
LD
LA
Used for
ℓ4
expansion
40 cm or less
LF
Used for
expansion
40 cm or less
LH
ℓ1
LG
L4
* Limit for height difference between indoor units after the fi nal branch
4 m or less
Fig. 3 Length of Refrigerant Tubing
Level line
Raised angle
(15 to 30 degrees)
Closed weld
GB - 5
L1
L2
When T-tee branch tubing is
used (header branch method)
LE
L3
ℓ5
ℓ6
ℓ7
ℓ48
ℓ2
ℓ3
2X m or more
More than 4 m
X m
Closed weld
Any angle
Indoor
Indoor
L3<2m
Outdoor
Fig. 5 Vertical Use
H1
H2
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