Mitsubishi Electric CITY MULTI Data Book page 359

1. Piping Design
1-2-6. IF more than 16 ports are in use, or if there is more than one BC controller in use for two
Heat source units
Note1. No Header usable on PQRY system.
Note2. Indoor unit sized P72-P96 should be connected to BC controller via Y shape joint CMY-R160-J1.
Note3. Indoor unit sized P72-P96 does NOT share BC controller ports with other Indoor units ;
Note4. As bents cause pressure loss on transportation of refrigerant, fewer bents design is better ;
Piping length needs to consider the actual length and equivalent length which bents are counted.
Equivalent piping length (m)=Actual piping length+"M" x Number of bent.
Note5. Set DIP-SW 4-6 to ON of BC controller, in case of connected Indoor unit sized P72-P96 with 2 ports.
Note6. Do not connect multiple indoor units to the same port when operating each of them in different mode (cooling,
heating, stop, and thermo-off). The indoor units connected to the same port must be set to operate in the same
mode. Set them in the same group to make them run/stop in the same mode all together. For other options,
enable the thermo setting on the remote controller, or set the common thermostat (optional) to run/stop the units
in the same mode based on a representative temperature.
Note7. The maximum total capacity of indoor units that can be connected to each sub BC controller CMB-P • NU-KB1
is P126.
Note8. Indoor capactiy is described as its model size. For example, PEFY-P24NMAU-E3, its capacity is P24.
Note9. Total down-stream Indoor capacity is the summary of the model size of Indoors down-stream. For example,
PEFY-P24NMAU-E3 + PEFY-P06NMAU-E3 : Total Indoor capacity = P24 + P06 = P30.
Note10. To connect the BC controller to the main pipe, use the reducer (CMY-R301S-G, CMY-R302S-G1, or CMY-R304S-G1).
Note11. To connect the sub BC controller to the main BC controller, use the reducer (CMY-R303S-G1, CMY-R305S-G1, or CMY-R306S-G).
Note12. Install the pipes correctly referring to the section titled "Procedures for installing the branched pipes."
Note13. Up to 11 sub BC controllers can be connected.
HU
HU
Heat source Twinning kit (High/Low press.)
CMY-Q100CBK2: Heat source unit P144 to P240
CMY-Q200CBK: Heat source unit P288 to P336
The Low press. kit is set in the Main unit;
The High press. kit is to be installed in the field.
h4
N Pipe (High pressure)
A L
M
A
Pipe (Low pressure)
BC controller (Main BC)
H H'
a
a
h1
B
b
b
B
c
c
IU IU IU
(P04-P54) (P72-P96)
(joint_A)
CMY-Y102SS-G2
CMY-Y102LS-G2
CMY-R160-J1 (joint)
Fig. 1-2-6A Piping scheme
Piping length limitation *11
Item
Total piping length (Total length of high pressure and liquid pipes)
Farthest IU from HU
Distance between HU and BC
Farthest IU from BC controller
Farthest IU from BC controller via Sub BC controller
Height between HU and IU (HU above IU)
Height between HU and IU (HU under IU)
Height between IU and BC
Height between IU and IU
Height between BC(Main or Sub) and BC(Sub)
Distance between Main unit and Sub unit
Height between Main unit and Sub unit
HU: Heat source Unit; IU: Indoor Unit; BC: BC controller
*1. Refer to the section 1-2-7.
*2. Details refer to Fig. 2.
*3. When the P72 or P96 model of indoor units are connected to the system, the maximum distance from the
BC controller to the farthest indoor unit (indicated as "D + E + i" in the figure is 40 meters.)
*4. Distance of Indoor sized P72, P96 from BC must be less than 10 m, if any.
*5. Distance of Indoor sized P72, P96 from IU must be less than 20 m, if any.
*6. When using 2 or more Sub BC controllers, max. height "h3" should be considered.
*7. 90 m is available depending on the model and installation conditions. For more detailed information,
contact your local distributor.
*8. 60 m is available depending on the model and installation conditions. For more detailed information,
contact your local distributor.
*9. When the piping length or the vertical separation exceeds the limit specified in Fig. 2, connect a sub
BC to the system.
The restriction for a system with a sub BC connection is shown in Fig. 3.
When a given system configuration falls within the shaded area in Fig. 3, increase the size of the high-pressure
pipe and the liquid pipe between the main BC and sub BC 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 and indoor unit by one size.
When using indoor models P54 or larger, the restrictions shown in Fig. 2 cannot be exceeded.
*10. When the high pressure piping length is 65 m or less, use ø22.2 (ø7/8) pipe.
When the high pressure piping length exceeds 65 m, use ø22.2 (ø7/8) pipe until 65 m, use ø28.58 (ø1-1/8)
pipe for the part that exceeds 65 m.
*11. Total length of high-pressure pipes and liquid pipes
MEES19K187
(P04-P54)
(joint_B)
CMY-R201S-G
CMY-R202S-G
CMY-R203S-G
CMY-R204S-G
CMY-R205S-G
BC controller (Sub BC)
F
F
F
CMY-R160-J1 (joint)
D E
D E
C
C g
f
f
e
e
d d
IU IU IU IU
Max. 3 sets for 1 port.
Max. 3 sets for 2 port.
Total capacity < = P54
P54 < Total capacity < = P96
IU (each) max < = P54
Piping in the figure
L+M+A+B+C+D+E+F+G+J+K+a+b+c+d+e+f+g+i+j+k+m+n
L(M)+A+F+G+J+K+n
L(M)+A
D+E+i
F+G+J+K+n
H
H'
h1
h2
h3
L+M or N
h4
S
CMY-R160-J1
(Gas side)
Fig. 1-2-6AA
IU
j
j
G J
G
G
BC controller (Sub BC)
k k
Pipe
Pipe (Gas)
i i
(Liquid)
g
IU
(P04-P54)
IU
Joint CMY-R160-J1 Liquid side
CMY-R160-J1
226
(Liquid side)
(M)ø3/8"(Brazing)
M
BC controller
(M)ø3/8"(Brazing)
Joint CMY-R160-J1 Gas side
N
226
T
(S)ø5/8"(Brazing)
IU
(S)ø5/8"(Brazing)
Pipe (LP Gas)
Pipe (Liquid)
Pipe (HP Gas)
K
J K
J K
BC controller (Sub BC)
BC controller (Sub BC)
m m
n n
IU
(P04-P54)
IU
(P04-P54)
HU: Heat source unit, IU: Indoor unit
Max. length Max. equivalent length
*1
165 [541'] 190 [623']
110 [360'] *1
110 [360'] *1
60 [197'] *2*3
60 [197'] *2 *3
90 [295'] *9
90 [295'] *9
50 [164'] *7
40 [131'] *8
15 [49'] (10 [32']) *4
30 [98'] (20 [65']) *5 )
15 [49'] (10 [32']) *6
5 [16']
0.1 [0.3']
Bent equivalent length
M (m/bent [ft./bent])
Heat source Model
0.50 [1.64']
P144ZSLMU
0.50 [1.64']
P168ZSLMU
0.50 [1.64']
P192ZSLMU
0.50 [1.64']
P216ZSLMU
0.50 [1.64']
P240ZSLMU
P288ZSLMU 0.70 [2.29']
0.70 [2.29']
P312ZSLMU
0.80 [2.62']
P336ZSLMU
(N)ø9.52ID
(T)ø19.05ID
h1
h3
h2
h1
(m [ft.])
-
-
-
-
-
-
-
-
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