Mitsubishi Electric CITY MULTI CMB-P-NU-G Installation Manual page 5

Distance between BC controller and farthest indoor unit
70 [229]
60 [196]
50 [164]
40 [131]
30 [98]
20 [65]
10 [32]
0
0 5 [16]
Height difference between BC controller and farthest indoor
unit (m [ft])
2. CMB-P108, 1010, 1013, 1016GA, P104, 108GB, 1016HA, 1016HB
[Fig. 2.4.2]
A
E
A
F
F G
A
B
H
a b
D D
J
A Outdoor unit
C SUB BC controller
E The Twinning Kit is connected inside the outdoor unit on the low-pressure side.
When outdoor units of different capacities are connected, connect the Twinning
Kit to the unit with a higher capacity.
F Twinning pipe (for R2 series) CMY-R100VBK, CMY-R100XLVBK
G Twinning pipe (for Y series) CMY-Y202-G2, CMY-Y102L-G2, CMY-Y102S-G2
H Twinning pipe (CMY-R160-J: optional)
I Twinning pipe (for Y series) CMY-Y102S-G2
J P72 - P96 model: 2 ports merged
K Maximum of 3 units per a pair of ports
Total capacity of 30 or below
All units connected to the same port must be in the same operation mode.
L Less than H=50 m [164 ft] (when the outdoor unit is higher than the indoor unit)
M Less than H1=40 m [131 ft] (when the outdoor unit is lower than the indoor unit)
N Less than h1=15 m [49 ft] (10 m [32 ft] or less for 36, 48 unit type)
O Less than h2=15 m [49 ft]
10 [32] 15 [49]
<System that has more than 16 branching points>
D
e
C
G D
C
C
E
I
B
c d
f
*6
D D
K
D
B MAIN BC controller
D Indoor unit
Item
Total piping length
Longest piping length
Between outdoor unit and
BC controller
Between indoor units and BC controller B+d or C+D+e or C+E+f Below 40 [131] *2
Between outdoor units
Between Above outdoor unit
indoor and
outdoor units Below outdoor unit
Between indoor units and BC controller
Between indoor units
Between BC controller (main or sub)
and BC controller (sub)
Between outdoor units
Notes:
A system that has more than 16 branching points requires 2 to 3 BC control-
lers (main and sub) and 3 pipes to connect the main and the sub BC control-
lers.
*1 Refer to "Restrictions on piping length" on P. 6.
*2 Please refer to the figure "Distance between main BC controller and far-
thest Indoor unit" when the distance between main BC controller and
farthest indoor unit exceeds 40 m [131 ft]. (Not applicable to the P96 model
indoor unit)
*3 The values in the parentheses show the maximum piping length to be
followed when the connection capacity of the indoor unit is 72 or more.
*4 In the system to which indoor units of the P72 model or above are con-
nected, neither a branch joint nor a branch header may be used.
*5 When connecting two sub BC controllers, the total piping length must be
equal to or less than the maximum length as listed in the table above.
*6 When connecting two sub BC controllers, install them in parallel.
*7 When the outdoor unit is 15-hp (P264 model) or more, use the HA-type
main BC controller. The GA-type BC controller cannot be connected to
the models between 27.5-hp (P264 model) and 30-hp (P288 model). The
G-type BC controller cannot be connected to the models between 15-hp
(P144 model) and 30-hp (P288 model).
*8 For Sub BC controller GB type, the connectable indoor unit capacities
may sum to equal that of a P120 unit or less. However, if two sub control-
lers are used the TOTAL sum of connectable units connected to BOTH
sub controllers must also not exceed that of a P120 unit.
For sub BC controller HB type, the connectable indoor unit capacities
may sum to equal that or a P120 unit or less. However, if two sub control-
lers are used the TOTAL sum of connectable units connected to BOTH
sub controllers must also not exceed that of a P168 unit.
*9 Indoor units that are connected to the same branch joint cannot be si-
multaneously operated in different operation modes.
*10 Do not connect the P72 or P96 models of indoor units and other models
of indoor units at the same port.
*11 When connecting multiple indoor units to one branch port, those indoor
units must be installed in the same room.
Distance between MAIN BC controller and farthest indoor unit
70 [229]
60 [196]
50 [164]
40 [131]
30 [98]
20 [65]
10 [32]
0
0 5 [16]
Height difference between MAIN BC controller and farthest
indoor unit (m [ft])
(Unit: m [ft])
Piping portion Allowable value
Not to exceed the
F+G+A+B+C
maximum refriger-
+D+E+a+b
ant piping length *1
+c+d+e+f
165 [541] or less
(Equivalent length of
F(G)+A+C+E+f
190 [623] or less)
F(G)+A Below 110 [360]
F+G Below 5 [16]
H Below 50 [164]
H1 Below 40 [131]
Below 15 [49]
h1
(Below 10 [32])*3
Below 15 [49]
h2
(Below 10 [32])*3
h3 Below 15 [49]
h4 Below 0.1 [5/16]
10 [32] 15 [49]
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