Mitsubishi Electric CITY MULTI Data Book page 351

1. Piping Design
1-2. Piping Design
1-2-1. IF 16 ports or less are in use, i.e., if only one BC controller is in use with no sub
BC controller.
"BC controller," "BC controller (Main)," and "BC controller (Sub)" that appear in this section refer to the J1-type, JA1/KA1 type, and KB1 type.
When mixing GA1/HA1/GB1/HB1 type and JA1/KA1/KB1 type, specifications and restrictions is according to GA1/HA1/GB1/HB1type. (piping length, connectable number of Sub BC)
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 mod (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. Indoor capactiy is described as its model size. For example, PEFY-P24NMAU-E3, its capacity is P24.
Note8. 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.
Note9. To connect the BC controller to the main pipe, use the reducer (CMY-R301S-G, CMY-R302S-G1, or CMY-R304S-G1).
Note10. Install the pipes correctly referring to the section titled "Procedures for installing the branched pipes."
HU
Pipe (High pressure)
H
H'
Refer to the
installation manual
for the connection
h1
Pipe (Liquid)
Pipe (Gas)
(P04-P54)
Fig. 1-2-1A Piping scheme
Piping length limitation *8
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
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
HU: Heat source Unit; IU: Indoor Unit; BC: BC controller
*1. Refer to the section 1-2-7.
*2. Details refer to Fig. 1.
*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. 90 m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*7. 60 m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*8. Total length of high-pressure pipes and liquid pipes
Fig. 1 Piping length and height between IU and BC controller
70
60
50
40
30
20
10
0
0
Height difference between the main BC controller
and farthest indoor unit (m)
250
200
150
100
50
0
0 5 10 15
Height difference between the main BC controller
and farthest indoor unit (ft)
MEES19K187
Pipe (Low pressure)
A
A
CMY-R160-J1 (joint)
BC controller (Main BC)
a
b
a
b
B C
C
B
c
c
IU
IU IU
(P72-P96) Max. 3 sets for 1 port.
Total capacity < = P54
CMY-R160-J1 (joint)
Piping in the figure
A+B+C+D+E+a+b+c+d+e+f+g+i
A+D+E+i
A
D+E+i
H
H'
h1
h2
5 10 15
20 25 30 35 40 45
CMY-R160-J1
( Gas
Fig. 1-2-1AA
(joint_A)
CMY-Y102SS-G2
CMY-Y102LS-G2
D
D
e f
d f
d
e
IU IU IU
(m [ft.])
Max. length Max. equivalent length
*1 -
165 [541'] 190 [623']
110 [360'] *1
110 [360'] *1
60 [197'] *2*3 60 [197'] *2*3
50 [164'] *6 -
40 [131'] *7 -
15 [49'] (10 [32']) *4
-
30 [98'] (20 [65']) *5 -
Piping "A"size selection rule
Heat source Model
P72TLMU, YLMU
P96-120TLMU, YLMU
P144-192TLMU, YLMU
P216TLMU, YLMU
P240TLMU, YLMU
*9. When the piping length is 65 m or longer, use the ø28.58
[1-1/8] pipe for the part that exceeds 65 m.
Piping "B", "C", "D", "E" size seleciton rule
Total down-stream Indoor capacity Pipe(Liquid)
P54 or less
P55-P72
P73-P96
Piping "a", "b", "c", "d", "e", "f", "g", "i" size selection rule
Indoor Unit size
P04-P18
P24-P54
P72
P96
Selection criteria for joints_A
Total down-stream Indoor capacity
-P72
P73-P96
Joint CMY-R160-J1 Liquid side
CMY-R160-J1
Liquid
( side)
(M)ø3/8"(Brazing)
M
BC controller
(M)ø3/8"(Brazing)
Joint CMY-R160-J1 Gas side
N
S
T
(S)ø5/8"(Brazing)
IU
side)
(S)ø5/8"(Brazing)
(P04-P54)
IU
i
i
E
E
h2
g
g
IU
Max. 3 sets for 2 port.
P54 < Total capacity < = P96
IU (each) max < = P54
HU: Heat source unit, IU: Indoor unit
Bent equivalent length
Heat source Model M (m/bent [ft./bent])
0.35 [1.15']
P72TLMU, YLMU
0.42 [1.38']
P96TLMU, YLMU
P120TLMU, YLMU 0.47 [1.54']
P144TLMU, YLMU 0.50 [1.64']
P168TLMU, YLMU 0.50 [1.64']
P192TLMU, YLMU 0.50 [1.64']
P216TLMU, YLMU 0.50 [1.64']
P240TLMU, YLMU 0.50 [1.64']
(mm [in.])
Pipe(High pressure) Pipe(Low pressure)
ø15.88 [5/8"] ø19.05 [3/4"]
ø19.05 [3/4"] ø22.20 [7/8"]
ø22.20 [7/8"] ø28.58 [1-1/8"]
ø22.20 [7/8"] *9 ø28.58 [1-1/8"]
ø22.20 [7/8"] *9 ø34.93 [1-3/8"]
Pipe(Gas)
ø9.52 [3/8"] ø15.88 [5/8"]
ø9.52 [3/8"] ø19.05 [3/4"]
ø9.52 [3/8"] ø22.20 [7/8"]
Pipe(Liquid) Pipe(Gas)
ø6.35 [1/4"] ø12.70 [1/2"]
ø9.52 [3/8"] ø15.88 [5/8"]
ø9.52 [3/8"] ø19.05 [3/4"]
ø9.52 [3/8"] ø22.20 [7/8"]
Joint
CMY-Y102SS-G2
CMY-Y102LS-G2
226
(N)ø9.52ID
226
(T)ø19.05ID
(mm [in.])
(mm [in.])
340