Toshiba MMY-MAP0726FT2P-UL Installation Manual page 14

◆ System restrictions
Max. No. of combined outdoor units
Max. capacity of combined outdoor units
Max. No. of combined indoor units
Max. capacity of combined indoor units
(*1) : 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".
25-EN
1122001201_EN FR.indd 13 1122001201_EN FR.indd 13
2 units
12 ton
25 units
135% of outdoor units' capacity
H2 ≤ 49 ft (15m)
150% of outdoor units' capacity (*1)
H2 > 49 ft (15m) 105% of outdoor units' capacity
– 13 –
◆ Allowable length and allowable height difference of refrigerant piping
Item
Total extension of pipe
(liquid pipe, real length)
Farthest piping length L
H2 9.8 ft
>
Max. equivalent length of
Main piping
H2 ≤ 9.8 ft
Pipe
length
Farthest equivalent piping length from the
first branch Li
Maximum equivalent piping length of pipes connected to outdoor
units
Maximum real length of terminal branching section to indoor units
Maximum real length of between
Flow Selector unit and indoor unit
Maximum equivalent length between branching section
Upper outdoor units
Height between outdoor
and indoor units H1
Lower outdoor units
Height
difference Upper outdoor units
Height between indoor
units H2
Lower outdoor units
Height between outdoor units H3 (*7)
<In case of connecting single port type Flow Selector unit and a branch of Multi port type Flow Selector unit to the indoor units.>
Maximum equivalent length indoor units in group control by one single port Flow
Selector unit Ln
Single port type
Maximum real length between
Flow Selector unit and indoor unit
Multi port type
Height difference between indoor units in group control by one Flow Selector
unit H4
(*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 + L10 + s + t), in case of branching to 6 : 590 ft.
(*3) : Total length of pipe should be less than 164 ft (L10 + s + t) 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) : Extension up to 98 ft is possible, please contact manufacturers representative for review.
(*7) : 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 072 144
Applicable total
88 198
refrigerant amount (lbs)
Allowable
Pipes
value (ft)
La + Lb + L1 + L2 + L3 + L4 + L5 +
L6 + L7 + L8 + L9 + L10 + L11 + a +
3281 (*1)
b + c + d + e + f + g + h + i + j +k +
l + m + n + o + p + q + r + s + t
Lb + L1 + L3 + L4 + L5
Equivalent length 656
+ L6 + L7 + L8 + o
Real length 591
(Lb + L1 + L3 + L9 + L10 + t)
Equivalent length 328
Real length 279
L1
Equivalent length 394
Real length 328
H1 > 9.8 ft 164
L3 + L4 + L5 + L6 + L7 + L8 + o
(L3 + L9 + L10 + t)
H1 < 9.8 ft 213
33 Lb (La)
98 a + f, b + g, c + h, d + i, e + j, k, l
Single port type 49 f, g, h, i, j
164
Multi port type p, q, r
(*2) (*3)
164 L2, L3, L4, L5, L9
230
–
(*4) (*5)
98 –
131 –
49 (*6) –
16 –
98 L6 + L7 + L8 + o
(Ex.) In case of wiring to the indoor
unit (m): L7 + m ≤ 49 ft
49
In case of wiring to the indoor
unit (n): L7 + L8 + n ≤ 49 ft
164 L10 + s, L10 + t < 164 ft
1.6 –
26-EN
9/2/16 1:30 PM 9/2/16 1:30 PM