6
GB
2. CMB-P108, 1012, 1016NU-JA1, CMB-P1016NU-KA1 (When a Sub BC controller is connected)
[Fig. 3.4.2]
Ⓓ
a
a
b
b
Ⓐ
Ⓔ
Ⓓ
Ⓓ
B
B
c
c
d
d
Ⓕ
Ⓖ
Ⓐ
Ⓒ
Ⓒ
Ⓒ
Ⓓ
Ⓓ
K
K
L
L
A
C
C
C
D
D
D
E
E
Ⓓ
Ⓒ
G
G
G
J
J
J
M
M
M
F
F
F
e
e
f
f
g
g
j
j
*1
Ⓖ
Ⓓ
h4
H
H1
h1
h1
h1
h3
h2
Ⓑ
E
Ⓖ
A
Ⓗ
A
Outdoor unit (Heat source unit)
B
BC controller (Main)
C
BC controller (Sub)
D
Indoor
unit
E
Indoor unit (Total capacity of downstream indoor unit: 72 to 96)
F
Twinning pipe (Model name: CMY-R160-J1)
G
2-Branch Joint Pipe
H
Up to three units for 1 branch hole
Total capacity: 54 or below (but same in cooling/heating mode)
(Unit: m [ft])
Item
Piping portion
Allowable value
Length
Total piping length
"K+L+A+B+C
+D+E+F+G+J
+M+a+b+c+d
+e+f+g+j"
Not to exceed
the maximum
refrigerant piping
length *1
Longest piping length
"K(L)+A+C
+E+G+J+j"
165 [541] or less
(Equivalent length
of 190 [623] or
less)
Between outdoor (heat source) unit
and Main BC controller
"K(L)+A"
110 [360] or less
Direct connection between indoor
units and (Main or Sub) BC controller
"a" or "b" or
"B+c" or
"B+d" or "e"
or "f" or "g" or
"j"
60 [196] or less *2
Between indoor units and Main BC
controller via Sub BC controller
"C+D+e" or
"C+E+F+f" or
"C+E+G+M+g"
or
"C+E+G+J+j"
90 [295] or less *3
Dif
ference of height
Between indoor
and outdoor
(heat source)
units
Above outdoor
(heat source) unit
H
50 [164] or less
Below outdoor
(heat source) unit
H1
40 [131] or less
Between BC controller (Both Main
and Sub) and indoor unit
h1
15 [49] or less
(10 [32] or less *4)
Between indoor units
h2
30 [98] or less
(20 [65] or less *4)
Between BC controller (Both Main
and Sub) and Sub BC controller
h3
15 [49] or less
Between outdoor (heat source) units h4
0.1 [5/16] or less
Notes:
A system that has more than 16 branching points requires 2 to 12 BC
controllers (main and sub) and 3 pipes to connect the main and the sub BC
controllers.
*1 Refer to “Restrictions on piping length” on P. 8.
*2 Refer to Fig. 1. (However, when P72 or P96 model of indoor unit is
connected, the maximum allowable distance between BC controller
and farthest indoor unit is 40 m.)
*3 When the piping length or the height difference exceeds the restriction
VSHFL¿HGLQ)LJFRQQHFWDVXE%&FRQWUROOHUWRWKHV\VWHP7KH
restriction for a system with a sub BC controller is shown in Fig. 2.
:KHQDJLYHQV\VWHPFRQ¿JXUDWLRQIDOOVZLWKLQWKHVKDGHGDUHDLQ)LJ
increase the size of the high-pressure pipe and the liquid pipe between
the main and sub BC controller by one size. When using P12, P15, P18,
P36, or P48 model of indoor units, increase the size of the liquid branch
pipe between the sub BC controller and indoor unit by one size.
When using P54 or larger model of indoor units, the restriction shown
in Fig. 1 cannot be exceeded.
*4 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.
*5 In the system to which indoor units of the P72 model or above are
connected, neither a branch joint nor a branch header may be used.
*6 When connecting two or more sub BC controllers, the total piping
length must be equal to or less than the maximum length as listed in
the table above.
*7 When the outdoor unit is 15-hp (P144 model) or more, use the JA-type
main BC controller. The J-type BC controller cannot be connected to
the models between 15-hp (P144 model) or more.
*8 The maximum total capacity of indoor units that can be connected to
each Sub BC controller is P126.
*9 Indoor units that are connected to the same branch joint cannot be
simultaneously 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.
*12 Sub BC controller cannot be used at
B
.
*13 For connecting 6 to 18 model indoor units
Have pipe expansion of indoor unit connecting port by cutting the piping at
the cutting point which depends on the indoor unit capacity.
*14 Up to 11 Sub BC controllers can be connected.
Unit 2
Unit 1
