Mitsubishi Electric CITY MULTI CMB-P-NU-J2 Manuel D'installation page 6

2. CMB-P108, 1012, 1016NU-JA2, CMB-P1016NU-KA2 (When a Sub BC controller is connected)
[Fig. 3.4.2]
Unit 2
Unit 1
Ⓐ
Ⓐ
K
L
L
K
A
A
Ⓓ
A Outdoor unit (Heat source unit)
C BC controller (Sub)
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)
Item
Total piping length
Longest piping length
Between outdoor (heat source) unit
and Main BC controller
Direct connection between indoor
units and (Main or Sub) BC controller
Between indoor units and Main BC
controller via Sub BC controller
Between indoor Above outdoor
(heat source) unit
and outdoor
(heat source)
Below outdoor
units
(heat source) unit
Between BC controller (Both Main
and Sub) and indoor unit
Between indoor units
Between BC controller (Both Main
and Sub) and Sub BC controller
Between outdoor (heat source) units h4
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.
Refer to "Restrictions on piping length" on P. 8.
*1
Refer to Fig. 1. (However, when P72 or P96 model of indoor unit is
*2
connected, the maximum allowable distance between BC controller
and farthest indoor unit is 40 m [131 ft].)
When the piping length or the height difference exceeds the restriction
*3
specified in Fig. 1, connect a sub BC controller to the system. The
restriction for a system with a sub BC controller is shown in Fig. 2.
When a given system configuration falls within the shaded area in Fig. 2,
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.
6
D
D
D
C
E
Ⓖ
Ⓑ
C E
E
C
F
Ⓕ
a
b
a b
Ⓖ
B
B
c
d d
c
Ⓓ
Ⓔ Ⓓ
*1
Ⓗ
B BC controller (Main)
D Indoor unit
(Unit: m [ft])
Piping portion Allowable value
"K+L+A+B+C Not to exceed
+D+E+F+G+J the maximum
+M+a+b+c+d refrigerant piping
+e+f+g+j" length *1
165 [541] or less
"K(L)+A+C (Equivalent length
+E+G+J+j" of 190 [623] or
less)
"K(L)+A" 110 [360] or less
"a" or "b" or
"B+c" or
"B+d" or "e" 60 [196] or less *2
or "f" or "g" or
"j"
"C+D+e" or
"C+E+F+f" or
"C+E+G+M+g" 90 [295] or less *3
or
"C+E+G+J+j"
H 50 [164] or less
H1 40 [131] or less
15 [49] or less
h1
(10 [32] or less *4)
30 [98] or less
h2
(20 [65] or less *4)
h3 15 [49] or less
0.1 [5/16] or less
Ⓓ
e
e
Ⓒ
Ⓖ
G
G
G
M
F
M
F
Ⓒ
M
f
f
Ⓓ
*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.
When the outdoor unit is 15-hp (P144 model) or more, use the JA-type
*7
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.
J
J
J
Ⓒ
Ⓒ
g
j
g
j
Ⓓ
Ⓓ