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25-EN 26-EN
◆ System restrictions
Max. No. of combined outdoor units 3 units
Max. capacity of combined outdoor units 38 ton
Max. No. of combined indoor units 64 units (*1)
Max. capacity of combined indoor units
H2 ≤ 49 ft (15m)
135% of outdoor units’ capacity
150% of outdoor units’ capacity (*2)
H2 > 49 ft (15m) 105% of outdoor units’ capacity
(*1) : In case without central control. It is up to 54 units in case with central control.
(*2) : If the system configure only the limited indoor unit type and limited number of connection indoor unit, total indoor capacity code up to 150%
of the outdoor capacity code is available when the height difference between the indoor units is 49 ft (15m) or less. When total indoor
capacity code exceeds 135% of outdoor unit capacity code, turn on SW09/Bit2 on I/F P.C. board of outdoor header unit.
* Permanent operation and heating operation below 80 % is not recommended.
For more information, please refer to the engineering data book.
◆ Cautions for installation
• Set the outdoor unit fi rst connected to the branching pipe to the indoor units as the header unit.
• Install the outdoor units in order of their capacity codes : (A) header unit ≥ (B) ≥ (C)
• Y-shaped branching joint must be installed horizontally.
• When piping to outdoor units using outdoor unit connection piping kits, intersect the pipes to the outdoor unit
and those to indoor units at a right angle as shown in fi gure 1 on “6. Installation of the outdoor unit”.
Do not connect them as in fi gure 2 on “6. Installation of the outdoor unit”.
◆ Allowable length and allowable height difference of refrigerant piping
Item
Allowable
value (ft)
Pipes
Pipe
length
Total extension of pipe
(liquid pipe, real length)
3281 (*1)
LA + La + Lb + Lc + 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 + o + p + q + r + s + t + u + v
Farthest piping length L
Equivalent length 656
LA+ Lc + L1 + L3 + L4 + L5 + L6 +
L7 + L8 + o
(LA + Lc + L1 + L3 + L9 + L10 + L11 + t)
(LA + Lc + L1 + L3 + L9 + L12 + L13 + v)
Real length 591
Max. length of
Main piping
H2
> 9.8 ft
Equivalent length 328
L1
Real length 279
H2 ≤ 9.8 ft
Equivalent length 394
Real length 328
Farthest equivalent piping length from the
first branch Li
H1 > 9.8 ft 164
L3 + L4 + L5 + L6 + L7 + L8 + o
(L3 + L9 + L10 + L11 + t)
(L3 + L9 + L12 + L13 + v)
H1
≦ 9.8 ft 213
Farthest equivalent piping length between outdoor units LO 49 LA + Lc (LA + Lb)
Maximum equivalent piping length of pipes connected to outdoor
units
33 Lc (La , Lb)
Maximum real length of terminal branching section to indoor units 98
a + f, b + g, c + h, d + i, e + j, k, l,
L6 + L7 + L8 + o (Ln)
Maximum real length of between
Flow Selector unit and indoor unit
Single port type 49 f, g, h, i, j, L7 + m, L7 + L8 + o
Multi port type
Single port long piping
type
164
(*2) (*3)
p, q, r, L11 + s, L11 + t, L13 + u,
L13 + v
Maximum equivalent length between branching section 164 L2, L3, L4, L5, L9, L10, L12
Height
difference
Height between outdoor
and indoor units H1
Upper outdoor units
230
(*4) (*5)
–
Lower outdoor units 98 –
Height between indoor
units H2
Upper outdoor units 131 –
Lower outdoor units (*6) 49 (*7) –
Height between outdoor units H3 (*8) 16 –
Height difference between indoor units in
one Flow Selector unit
Single port type H4 0.5m –
Single port type
(Long piping model) H6
3m
–
Multi port type H5 –
(*1) : Total refrigerant amount in the system is restricted according to capacity type. Refer to the table below.
(*2) : The total piping length in one FS unit in case of branching to 4 : 394 ft (p + q + r + L11 + s + t), in case of branching to 6 : 590 ft.
(*3) : Total length of pipe should be less than 164 ft (L11 + s + t, L13 + u + v) per branch.
(*4) : If the height difference (H2) between indoor units exceeds 9.8 ft, set 164 ft or less.
(*5) : Extension up to 295 ft is possible, please contact manufacturers representative for review.
(*6) : In case the system capacity is greater than 22 ton, it is 9.8 ft. Up to 49 ft is possible, please contact manufacturers representative
for review.
(*7) : Extension up to 98 ft is possible, please contact our manufacturers representative for review.
(*8) : Ensure that the header unit is installed below all connected follower outdoor unit(s).
Possible product failure may occur if header unit is installed above any follower unit(s).
Capacity type 072 096 120 144 168 192 216 240 264 288 312 336 360 384 408 432 456
Applicable total
refrigerant amount (Ibs)
88 132 132 198 198 220 220 287 287 287 287 308 308 308 308 308 308
kg 40 55 55 85 85 100 100 100 100 100 100 140 140 140 140 140 140
1122001001-2_EN-FR.indb 131122001001-2_EN-FR.indb 13 2/18/17 11:44 AM2/18/17 11:44 AM
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