Length
(Unit: m)
Item
Piping portion
Allowable value
F+G+A+B+C
Total piping length
+D+E+a+b
+c+d+e+f
Longest piping length
F(G)+A+C+E+f
Between outdoor unit and
F(G)+A
Below 110
BC controller
Between indoor units and BC controller B+d or C+D+e or C+E+f
Below 40 *2
Between outdoor units
F+G
Below 5
Above outdoor unit
H
Below 50
Below outdoor unit
H1
Below 40
Between indoor units and BC controller
h1
Below 15
(Below 10)*3
Between indoor units
h2
Below 15
(Below 10)*3
Between BC controller (main or sub)
h3
Below 15
and BC controller (sub)
Between outdoor units
h4
Below 0.1
Diff
erence of ele
v
ation
Between
indoor and
outdoor units
Not to exceed the
maximum refriger-
ant piping length *1
[Fig. 2.4.2]
2.4
CMB-P108, 1010, 1013, 1016GA1, P104, 108GB1 (GA1: In the case the outdoor unit is 26-hp (P650 model) or less.)
CMB-P1016HA1, 1016HB1 (HA1: In the case the outdoor unit is 28-hp (P700 model) or more.)
a
C
b
B
c
d
f
D
E
A
e
F
G
h2
h1
h3
h1
C
C
D
D
D
D
D
D
F
A
A
B
I
J
H
G
E
L
M
N
O
H1
H
h4
*6
K
A
Outdoor unit
B
MAIN BC controller
C
SUB BC controller
D
Indoor unit
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-R200VBK
(for WR2 series) CMY-Q100VBK
G
Twinning pipe (for Y series) CMY-Y202-G2, CMY-Y102L-G2, CMY-Y102S-G2
H
Twinning pipe (CMY-R160-J1: optional)
I
Twinning pipe (for Y series) CMY-Y102S-G2
J
P100 - P250 model: 2 ports merged
K
Maximum of 3 units per a pair of ports
Total capacity of 80 or below
All units connected to the same port must be in the same operation mode.
L
Less than H=50 m (when the outdoor unit is higher than the indoor unit)
M
Less than H1=40 m (when the outdoor unit is lower than the indoor unit)
N
Less than h1=15 m (10 m or less for 200, 250 unit type)
O
Less than h2=15 m
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. 4.
*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. (Not applicable to the P250 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 200 or more.
*4 In the system to which indoor units of the P200 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 on the left.
*6 When connecting two sub BC controllers, install them in parallel.
*7 In the system to which indoor units of the P100 through P140 models are
connected, merge the two ports before connecting them. (Set DIP SW4-6
on the main BC controller to ON.)
*8 It is possible to connect the P100 through P140 models of indoor units to
a single port. (Set DIP SW4-6 to OFF.) Note that the cooling capacity will
somewhat decrease. (The factory setting for DIP SW4-6 is OFF.)
*9 When the outdoor unit is 28-hp (P700 model) or more, use the HA-type
main BC controller. The G-type BC controller cannot be connected to the
models between 16-hp (P400 model) and 26-hp (P650 model), and the G-
and GA-type BC controllers cannot be connected to the 28-hp (P650
model) or more.
*10 For Sub BC controller GB type, the connectable indoor unit capacities
may sum to equal that of a P350 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 P350 unit.
For sub BC controller HB type, the connectable indoor unit capacities
may sum to equal that or a P350 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 P450 unit.
*11 Indoor units that are connected to the same branch joint cannot be si-
multaneously operated in different operation modes.
*12 Do not connect the P200 or P250 models of indoor units and other mod-
els of indoor units at the same port.
<System that has more than 16 branching points>
Distance between MAIN BC controller
and farthest indoor unit
Height difference between
MAIN BC controller and
farthest indoor unit (m)
15
10
5
20
10
0
0
Distance between MAIN BC controller
and farthest indoor unit (m)
70
60
50
40
30
165 m or less
(Equivalent length
of 190 m or less)
3
