Toshiba MMY-SUG0801MT8P-E Installation Manual page 38

System restriction
Outdoor unit combination
Max capacity of outdoor units
Indoor unit connection
Total capacity of indoor units (Varies depending on the height
difference between indoor units.)
(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.
Allowable length and allowable height difference of refrigerant piping
Item
Total extension of pipe
(Liquid pipe, real length)
Farthest piping length L
Max.equivalent length of Main piping L1
Pipe length
Equivalent length of farthest piping from 1 st branching Li
Max. real length of piping from the end branch to the indoor unit
Max. equivalent length between branches
Max. real length of piping from Flow selector unit to the indoor unit Ln
The total piping length in one
Multi port type Flow Selector unit
Height difference between
outdoor and indoor unit H1
Difference
in height
Height difference between indoor
units H2
Height difference between indoor units connected to the same Flow
selector unit H3
(*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 flare 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.
73-EN
Only 1 unit
Up to 24 HP
Up to 54 units
H2 [ 15 m 200% of outdoor units capacity(*1)
H2 > 15 m 105% of outdoor units capacity
Allowable
Piping section
Value
L1 + L2 + L3 + L4 + L5 + L6 +
L7 + L8 + L9 + L10 + L11 + L12
500 m (*1)
+ L13 + L14 + a + b + c + d + e
+ f + g + h + i + j + k + l + m +n
Equivalent length 190 m
L1 + L3 + L13 + L14 + n
Real length 165 m
Equivalent length 125 m
L1
Real length 100 m
H1 > 3 m 50 m
L3 + L13 + L14 + n
H1 [ 3 m 65 m
L4 + a, L5 + b, L6 + c, d, e, L10
50 m
+ f, g, h, i, j, k, l, m, n
L2, L3, L4, L5, L6, L7, L8, L9,
50 m
L10, L11, L12, L13, L14
L11 + g, L11+ L12 + h, L11 +
50 m
L12 + i, L14 + m, L14 + n
4 branches Max 120 m
L14 + j + k + l + m + n
8 or 12 branches (*3) Max 180 m
H2 > 3 m 50 m
Upper outdoor unit
70 m
H2 [ 3 m
90 m (*2)
Lower outdoor unit 40 m
Upper outdoor unit 40 m
Lower outdoor unit 30 m
15 m
– 37 –
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74-EN