Piping Design - Mitsubishi Electric PQRY-P72TLMU-A Manual

12. PIPING DESIGN

12-1. R410A Piping Material
The maximum operation pressure of R410A air conditioner is 4.15 MPa [601 psi]. The refrigerant piping should ensure the safety
under the maximum operation pressure. You shall follow the loca and/or regulations is applicable at a higher priority.
12-2. Piping Design
12-2-1. IF 16 ports or less are in use, I.e., if only one BC controller is in use with no sub BC controller.
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. Indoor unit capacities are included in the model name. For example, PEFY-P24NMSU-E has a capacity
of 24,000 BTUs.
Note6. 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.
HU
Refer to the
installation manual
H H'
for the connection
h1
Fig. 12-2-1-1 Piping scheme
Table . Piping length limitation
12-2-1-1
Item
Total piping length
Farthest IU from HU
Distance between HU and BC
Farthest IU from BC controller
Height between HU and IU (HU above IU) H
Height between HU and IU (HU under IU ) H'
Height between IU and BC
Height between IU and IU
HU: Heat source Unit ; IU: Indoor Unit ; BC: BC controller
*1. Please refer to Fig.3-2-4
*2. Farthest Indoor from BC controller "D+E+h" can exceed 40 m [131 ft.] till 60 m [197 ft.] if no Indoor sized P72, P96 connected. Details refer to Fig.12-2-1-2
*3. Distance of Indoor sized P72, P96 from BC must be less than 10 m [32 ft.], if any.
Fig. 12-2-1-2 Piping length and height between IU and BC controller
70
60
50
40
30
20
10
0
0 5
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)
© 2017 Mitsubishi Electric US, Inc.
A
BC controller
B
a b
c
IU IU IU
(P06-P54) (P72-P96)
Max. 3 sets for 1 port.
Total capacity < = P54
CMY-R160-J1 (joint)
Not possible to remove
Piping in the figure Max. length
A+B+C+D+E+a+b+c+d+e+f+g+h *1
A+D+E+h 165 [541']
A 110 [360'] *1
D+E+h 40 [131'] *2
50 [164']
40 [131']
15 [49'] (10 [32']) *3
h1
h2 15 [49'] (10 [32']) *3
10 15
20 25 30 35 40 45
PQRY-P-T(S)LMU, Y(S)LMU (April 2017 Ver2)
CMY-R160-J1 (joint)
Not possible to remove
D
E
C
g
e f
d
IU IU IU IU
Max. 3 sets for 1 port.
P54 < Total capacity < = P96
IU (each) max < = P54
(m [ft.])
Max. equivalent length
-
190 [623']
110 [360'] *1
40 [131'] *2
-
-
-
-
Table12-2-1-3. Piping "A"size selection rule
Heat source Model Pipe(High pressure)
P72TLMU,YLMU ø15.88 [5/8"]
P96-120TLMU,YLMU ø19.05 [3/4"]
P144-192TLMU,YLMU ø22.20 [7/8"]
P216TLMU,YLMU ø22.20 [7/8"] *4
P240TLMU,YLMU ø22.20 [7/8"] *4
*4. When the piping length is 65 m or longer, use the ø28.58
[1-1/8] pipe for the part that exceeds 65 m.
Table12-2-1-4. Piping "B", "C", "D", "E" size seleciton rule (mm [in.])
Total down-stream Indoor capacity Pipe(Liquid)
P54 or less ø9.52 [3/8"]
P55-P72 ø9.52 [3/8"]
P73-P96 ø9.52 [3/8"]
Table12-2-1-5. Piping "a", "b", "c", "d", "e", "f", "g", "h" size selection rule (mm [in.])
Indoor Unit size Pipe(Liquid)
P06 to P18 ø6.35 [1/4"]
P24 to P54 ø9.52 [3/8"]
P72 ø9.52 [3/8"]
P96 ø9.52 [3/8"]
IU
h
h2
Table11-2-1-2. Bends equivalent length "M"
Heat source Model M (m/bends [ft./bends])
P72TLMU,YLMU 0.35 [1.15']
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(Low pressure)
ø19.05 [3/4"]
ø22.20 [7/8"]
ø28.58 [1-1/8"]
ø28.58 [1-1/8"]
ø34.93 [1-3/8"]
Pipe(Gas)
ø15.88 [5/8"]
ø19.05 [3/4"]
ø22.20 [7/8"]
Pipe(Gas)
ø12.70 [1/2"]
ø15.88 [5/8"]
ø19.05 [3/4"]
ø22.20 [7/8"]
WR2-139