WR2-140
PQRY-P-T(S)LMU, Y(S)LMU (April 2017 Ver2)
© 2017 Mitsubishi Electric US, Inc.
12. PIPING DESIGN
12-2-2. IF more than 16 ports are in use, or if there is more than one BC controller in use for one heat source unit
Table
12-2-2-1
. Piping length limitation
(m [ft.])
Item
Piping in the figure
Max. length
Max. equivalent length
Total piping length
A+B+C+D+E+F+G+H+a+b+c+d+e+f+g+h+j+k
*1
-
Farthest IU from HU
A+F+H+k
165 [541']
190 [623']
Distance between HU and BC
A
110 [360'] *1
110 [360'] *1
Farthest IU from BC controller
D+E+h or F+H+k
40 [131'] *2
40 [131'] *2
Height between HU and IU (HU above IU)
H
50 [164']
Height between HU and IU (HU under IU)
H'
40 [131']
Height between IU and BC
h1
15 [49'] (10 [32']) *3
-
-
-
Height between IU and IU
h2
15 [49'] (10 [32']) *3
-
Height between BC(Main or Sub) and BC(Sub) h3
15 [49'] (10 [32']) *4
-
Fig. 3-2-2-2 Piping length and height between IU and BC controller
Table12-2-2-4. Piping "B", "C", "D", "E" size selection rule
(mm [in.])
Total down-stream Indoor capacity
Pipe(Liquid)
Pipe(Gas)
P73-P96
ø9.52 [3/8"]
ø22.20 [7/8"]
Table12-2-2-5
.
Piping "F", "G", "H" size selection rule
(mm [in.])
Total down-stream Indoor capacity
Pipe(Liquid)
Pipe(HP Gas)
Pipe(LP Gas)
P72 or less
ø9.52 [3/8"]
ø15.88 [5/8"]
ø19.05 [3/4"]
P73 to P108
ø9.52 [3/8"]
ø19.05 [3/4"]
ø22.20 [7/8"]
P109 to P126
ø12.70 [1/2"] ø19.05 [3/4"]
ø28.58 [1-1/8"]
P127 to P144
ø12.70 [1/2"] ø22.20 [7/8"]
ø28.58 [1-1/8"]
P145 to P168
ø15.88 [5/8"] ø22.20 [7/8"]
ø28.58 [1-1/8"]
HP: High pressure, LP: Low pressure
Table12-2-2-6
. Piping "a", "b", "c", "d"
, "e", "f", "g", "h", "j", "k"
size selection rule (mm [in.])
Indoor Unit size
Pipe(Liquid)
Pipe(Gas)
P06 to P18
ø6.35 [1/4"]
ø12.70 [1/2"]
P24 to P54
ø9.52 [3/8"]
ø15.88 [5/8"]
P72
ø9.52 [3/8"]
ø19.05 [3/4"]
P96
ø9.52 [3/8"]
ø22.20 [7/8"]
P55-P72
ø9.52 [3/8"]
ø19.05 [3/4"]
P54 or less
ø9.52 [3/8"]
ø15.88 [5/8"]
HU: Heat source Unit; IU: Indoor Unit; BC: BC controller
*1. Please refer to Fig.12-2-4
*2. Farthest Indoor from BC controller "D+E+h or F+H+k" can exceed 40 m [131 ft.] till 60 m [197 ft.] if no Indoor sized P72, P96 connected.
Details refer to Fig.12-2-2-2
*3. Distance of Indoor sized P72, P96 from BC must be less than 10 m [32 ft.], if any.
*4. When using 2 Sub BC controllers, max. height "h3" should be considered.
HU: Heat source unit, IU: Indoor unit
HU
Fig. 12-2-2-1 Piping scheme
Note1. PQRY systems do not require headers.
Note2. Indoor units sized P72-P96 should be connected to a BC controller using the Y-shaped
CMY-R160-J1 joint adapter. These indoor units cannot use the same BC controller ports
as other units. (They must use their own individual BC controller port.)
Note3. As bends cause pressure loss on transportation of refrigerant, the fewer bends in the system,
the better it is. Piping length needs to factor in the actual length and equivalent length in which
the bends are counted.
Note4. Indoor units connected to the BC controller sharing one port cannot operate separately in heating
and cooling modes simultaneously; i.e., they must function in either heating or cooling in tandem.
Note5. For sub BC controller CMB-P-NU-GB1, the total connectable indoor unit capacity can be 126,000 BTUs or less.
If two sub BC controllers are used, the total indoor unit capacity connected to BOTH sub BC controllers also cannot exceed 126,000 BTUs.
For sub BC controller CMB-P1016NU-HB1 the total connectable indoor unit capacity can be 126,000 BTUs or less. However, if two sub controllers are used, the total indoor unit capacity
connected to BOTH sub controllers must NOT exceed 168,000 BTUs.
Note6. Indoor unit capacities are included in the model name. For example, PEFY-P24NMSU-E has a
capacity of 24,000 BTUs.
Note7. Total "downstream indoor capacity" is the total of all the indoor units connected downstream.
For example, PEFY-P24NMSU-E + PEFY-P12NMSU-E: Total Indoor Unit Capacity = P24 + P12 = P36.
Height difference between the main BC controller
and farthest indoor unit (m)
Pi
pe length between the main BC controller and indoor unit (m)
Height difference between the main BC controller
and farthest indoor unit (ft)
Pi
pe length between the main BC controller and indoor unit (ft)
0
10
20
30
40
50
60
70
0
5
10
15
0
50
100
150
200
250
0
5
10
15
20
25
30
35
40
45
Table12-2-2-2. Bends equivalent length "M"
Heat source Model M (m/bends [ft./bends])
P144TLMU,YLMU
0.50 [1.64']
P168TLMU,YLMU
0.50 [1.64']
P192TLMU,YLMU
0.50 [1.64']
P216TLMU,YLMU
0.50 [1.64']
P72TLMU,YLMU
0.35 [1.15']
P96TLMU,YLMU
0.42 [1.38']
P120TLMU,YLMU
0.47 [1.54']
P240TLMU,YLMU
0.50 [1.64']
Table12-2-2-3. Piping "A"size selection rule
(mm [in.])
Heat source Model
Pipe(High pressure)
Pipe(Low pressure)
P72TLMU,YLMU
ø15.88 [5/8"]
ø19.05 [3/4"]
P216TLMU,YLMU
ø22.20 [7/8"] *5
ø28.58 [1-1/8"]
P240TLMU,YLMU
ø22.20 [7/8"] *5
ø34.93 [1-3/8"]
P96-120TLMU,YLMU
ø19.05 [3/4"]
ø22.20 [7/8"]
P144-192TLMU,YLMU
ø22.20 [7/8"]
ø28.58 [1-1/8"]
*5. When the piping length is 65 m or longer, use the ø28.58 [1-1/8]
pipe for the part that exceeds 65 m.
h1
k
h3
h1
h2
j
F
G
H
BC controller (Sub BC)
BC controller (Sub BC)
H
H'
h1
A
h
g
f
e
d
c
IU
IU
IU
IU
IU
IU
IU
IU
BC controller (Main BC)
Max. 3 sets for 1 port.
Total capacity < = P54
(P06-P54)
(P72-P96)
CMY-R160-J1 (joint)
Not possible to remove
Refer to the
installation manual
for the connection
B
C
D
IU
E
a
b
CMY-R160-J1 (joint)
Not possible to remove
IU
Max. 3 sets for 1 port.
P54 < Total capacity < = P96
IU (each) max < = P54
