Mitsubishi Electric City Multi CMB-P1016NU-G, Service Handbook

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[
II
Restrictions ]
(2) Line branching
System that requires more than 16 BC controller ports or with multiple BC controllers
<System with both main and sub BC controllers>
* A system that requires more than 16 BC controller ports requires two or three BC controllers (main and sub), and
three pipes will be used between the main and the sub BC controllers.
* In the system to which indoor units of P72 model or above are connected, neither a branch joint nor a branch header
may be used.
Unit: m [ft]
Operation Pipe sections Allowable length of pipes
Length Total pipe length A+B+C
+a+b+c+d+e+f+g
300 [984] or less
*1
*1. When the aggregate length of all pipes exceeds 300m [984ft], observe the restrictions in the figure titled "Restrictions
on pipe length" below.
Total pipe length from the heat source unit to the
farthest indoor unit A+C+g or C+g 150 [492] or less
(Equivalent length 175 [574] or less)
Between heat source unit and BC controller A 110 [360] or less
Between BC controller and indoor unit e or C+g 40 [131] or less
*2
*2. When the overall pipe length between the BC controller and the farthest indoor unit exceeds 40m [131ft], observe the
restrictions in the figure titled "Restrictions on pipe length" below. (Except the P96 models)
Height
difference Between indoor and
heat source units Heat source unit above
indoor unit H 50 [164] or less
Heat source unit below
indoor unit H' 40 [131] or less
Between indoor unit and BC controller h1 15 [49] or less (10 [32] or less)
*3
*3. When the capacity of the connected indoor units is P72 or above, use the figures in the parentheses as a reference.
Between indoor units h2 15 [49] or less (10 [32] or less)
*3
Between main BC controller and sub BC controller h3 15 [49] or less
Between indoor unit (main BC controller) and
indoor unit (sub BC controller) h4 15 [49] or less (10 [32] or less)
*3*4
*4. When connecting 2 sub BC controllers to a system, observe the allowable length in the table above.
Heat source unit
B
A
a
b
c
C
f
g
h3
h4
d
e
H=50 m [164ft] or less(Heat source unit above indoor unit) H'=40 m [131ft] or less(Heat source unit below indoor unit)
h1=15m [49ft] or less
h2=15m [49ft] or less
110 m [360ft] or less
40 m [131ft] or less
BC controller
main unit
BC controller
sub unit
Indoor unit
Indoor unit Indoor unit
Indoor unit
Indoor unit
<System that requires more than 16 BC controller ports>
Indoor unit
Indoor unit
Note1) When connecting 2 sub BC controllers to a system, install them in parallel.
Note1)
(P161 - P280 models:
2 ports merged with
a junction pipe)
Junction pipe
(Optional accessory)
Branch joint
(For use with the Y series)
CMY-Y102S-G
Maximum of 3 units per port
Total capacity of P160 or below
(All units connected to the same port
must be in the same operating mode)
Restrictions on pipe length The height difference and the pipe length between BC controller and indoor units (A)
Height difference between main BC controller and farthest indoor unit (m[ft])
Aggregate length of all pipes (m[ft])
Pipe length between main BC
controller and farthest indoor unit (m[ft])
400[1312]
350[1148]
300[984]
250[820]
200[656]
30
[98]
40
[131]
50
[164]
60
[196]
70
[229]
80
[262]
90
[295]
100
[328]
110
[360]
Pipe length between heat source unit and BC controller (m[ft])
70[229]
60[196]
40[131]
30[98]
50[164]
10[32]
20[65]
0 0
5
[16]
10
[32]
15
[49]