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3.4. Checking the installation site
Check that the difference of elevation between indoor and outdoor units and the
length of refrigerant piping are within the following limitations.
1. CMB-P104, 105, 106, 108, 1010, 1013, 1016G (In the case the outdoor
unit is 12.5-hp (P120 model) or less, and 16 or fewer ports are used.)
[Fig. 3.4.1]
A
I
A
B
H
a
C
b
C
D
A Outdoor unit
C Indoor unit
E Less than H=50 m [164 ft] (when the outdoor unit is higher than the indoor unit)
F Less than H1=40 m [131 ft] (when the outdoor unit is lower than the indoor unit)
G Twinning pipe (for Y Series) CMY-Y102S-G2
H Combined pipe (CMY-R160-J1: optional)
I Less than 110 m [360 ft]
K Up to three units for 1 branch hole
Total capacity: less than 30 (but same in cooling/heating mode)
L Less than h1=15 m [49 ft] (10 m [32 ft] or less for 200, 250 unit type)
M Less than h2=15 m [49 ft]
Item
Total piping length
Longest piping length
Between outdoor unit and BC controller
Between indoor units and BC controller
Above outdoor unit
Between indoor
and outdoor units
Below outdoor unit
Between indoor units and BC controller
Between indoor units
Notes:
*1 Refer to "Restrictions on piping length" on P. 7.
Indoor unit" when the distance between BC controller and farthest in-
door unit exceeds 40 m [131ft]. (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 Do not connect the P72 or P96 models of indoor units and other mod-
els of indoor units at the same port.
*6 Indoor units that are connected to the same branch joint cannot be si-
multaneously operated in different operation modes.
*7 When connecting multiple indoor units to one branch port, those in-
door units must be installed in the same room.
J
G
B
c
d
e
C
C
K
C
B BC controller
D P72 - P96 model: 2 ports merged.
J Less than 40 m [131ft]
(Unit: m [ft])
Piping portion
Allowable value
Not to exceed the
A+B+a+b
maximum refriger-
+c+d+e
ant piping length *1
165 [541] or less
A+e
(Equivalent length
of 190 [623] or less)
A
Below 110 [360]
e
Below 40 [131] *2
H
Below 50 [164]
H1
Below 40 [131]
Below 15 [49]
h1
(Below 10 [32])*3
Below 15 [49]
h2
(Below 10 [32])*3
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. 3.4.2]
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-J1: 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]
Item
Total piping length
Longest piping length
Between outdoor unit and BC controller
Between indoor units and BC controller
Between outdoor unit
Above outdoor unit
Between 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 indoor units
10 [32]
15 [49]
<System that has more than 16 branching points>
D
e
C
G
D
C
C
I
E
B
c
d
f
*6
D
D
K
D
B MAIN BC controller
D Indoor unit
(Unit: m [ft])
Piping portion
Allowable value
F+G+A+B+C
Not to exceed the
+D+E+a+b
maximum refriger-
+c+d+e+f
ant piping length *1
165 [541] or less
F(G)+A+C+E+f
(Equivalent length
of 190 [623] or less)
F(G)+A
Below 110 [360]
B+d or C+D
Below 40 [131] *2
+e or C+E+f
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]
5
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