74-EN
73-EN
– 37 –
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System restriction
Outdoor unit combination
Only 1 unit
Max capacity of outdoor units
Up to 24 HP
Indoor unit connection
Up to 54 units
Total capacity of indoor units (Varies depending on the height
difference between indoor units.)
H2
[
15 m 200% of outdoor units capacity(*1)
H2 > 15 m 105% of outdoor units capacity
(1*): If it exceeds 135%, there is a limit to the maximum number of indoor units that can be connected.
(2*): Multi port type Flow Selector unit is considered a branch.
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Allowable length and allowable height difference of refrigerant piping
Item
Allowable
Value
Piping section
Pipe length
Total extension of pipe
(Liquid pipe, real length)
500 m (*1)
L1 + L2 + L3 + L4 + L5 + L6 +
L7 + L8 + L9 + L10 + L11 + L12
+ L13 + L14 + a + b + c + d + e
+ f + g + h + i + j + k + l + m +n
Farthest piping length
L
Equivalent length
190 m
L1 + L3 + L13 + L14 + n
Real length
165 m
Max.equivalent length of Main piping
L1
Equivalent length
125 m
L1
Real length
100 m
Equivalent length of farthest piping from 1 st branching
Li
H1 > 3 m
50 m
L3 + L13 + L14 + n
H1
[
3 m
65 m
Max. real length of piping from the end branch to the indoor unit
50 m
L4 + a, L5 + b, L6 + c, d, e, L10
+ f, g, h, i, j, k, l, m, n
Max. equivalent length between branches
50 m
L2, L3, L4, L5, L6, L7, L8, L9,
L10, L11, L12, L13, L14
Max. real length of piping from Flow selector unit to the indoor unit
Ln
50 m
L11 + g, L11+ L12 + h, L11 +
L12 + i, L14 + m, L14 + n
The total piping length in one
Multi port type Flow Selector unit
4 branches
Max
120 m
L14 + j + k + l + m + n
8 or 12 branches (*3)
Max
180 m
Difference
in height
Height difference between
outdoor and indoor unit
H1
Upper outdoor unit
H2 > 3 m
50 m
-----
H2
[
3 m
70 m
90 m (*2)
Lower outdoor unit
40 m
Height difference between indoor
units
H2
Upper outdoor unit
40 m
-----
Lower outdoor unit
30 m
Height difference between indoor units connected to the same Flow
selector unit
H3
15 m
-----
(*1): The total amount of system refrigerant should be 63.8 kg or less.
(*2): Extension up till 90 m is possible with conditions below :
- Connected ratio of indoor units to outdoor units is below 105%
- Liquid side has been increased 1 size from standard size
- Change the connection method of the indoor unit from
fl
are connection to welding connection.
(*3): When using a Multi port type Flow Selector unit, be sure to set the piping length between the indoor and the
Flow Selector unit at least 10 m.
If a piping length of 10 m or longer is not secured, refrigerant noise generated from the Multi port type Flow
Selector unit may propagate to the indoor unit.
(*4): For installation conditions, refer to the precautions of equipment using R32.
