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[2-10 Restrictions on Refrigerant Pipes ]
2-10 Restrictions on Refrigerant Pipes
2-10-1
Restrictions on Refrigerant Pipe Length
(1) System that requires 16 BC controller ports or fewer <System with only the main BC controller
or standard BC controller>
Note1. No Header usable on PURY 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. 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 "Outdoor Twinning Kit."
OU
Pipe (High pressure)
H
H'
Refer to the
installation manual
for the connection
h1
Pipe (Liquid)
Pipe (Gas)
IU
(P05-P54)
Fig. B Piping scheme
Piping length limitation *8
Item
Total piping length (Total length of high pressure and liquid pipes)
Farthest IU from OU
Distance between OU and BC
Farthest IU from BC controller
Height between OU and IU (OU above IU)
Height between OU and IU (OU under IU)
Height between IU and BC
Height between IU and IU
OU: Outdoor Unit; IU: Indoor Unit; BC: BC controller
*1. Refer to the pages 36, 37.
*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
5
Height difference between the main BC controller
and farthest indoor unit (m)
HWE18220_GB
Pipe (Low pressure)
A
A
CMY-R160-J1 (joint)
BC controller (Main BC)
(joint_A)
CMY-Y102SS-G2
CMY-Y102LS-G2
a
b
a
b
B
C
B
C
c
d
c
IU
IU
Max. 3 sets for 1 port.
(P72-P96)
Total capacity < = P54
CMY-R160-J1 (joint)
Piping in the figure
Max. length
A+B+C+D+E+a+b+c+d+e+f+g+i
*1
165 [541']
A+D+E+i
A
110 [360'] *1
D+E+i
60 [197'] *2*3
H
50 [164'] *6
40 [131'] *7
H'
h1
15 [49'] (10 [32']) *4
h2
30 [98'] (20 [65']) *5
10
15
CMY-R160-J1
(
Liquid
M
BC controller
S
T
CMY-R160-J1
Gas
(
side)
Fig. A
E
D
E
D
e
f
g
f
d
e
IU
IU
IU
Max. 3 sets for 2 port.
P54 < Total capacity < = P96
IU (each) max < = P54
(m [ft.])
Max. equivalent length
-
190 [623']
110 [360'] *1
60 [197'] *2*3
-
-
-
-
250
200
150
100
50
0
0
5
10
15
20
25
30
Height difference between the main BC controller
and farthest indoor unit (ft)
Joint CMY-R160-J1 Liquid side
226
side)
(M)ø3/8"(Brazing)
(N)ø9.52ID
(M)ø3/8"(Brazing)
Joint CMY-R160-J1 Gas side
N
226
(S)ø5/8"(Brazing)
IU
(T)ø19.05ID
(S)ø5/8"(Brazing)
(P05-P54)
IU
i
i
h2
g
IU
OU: Outdoor unit, IU: Indoor unit
Bent equivalent length
Outdoor Model
M (m/bent [ft./bent])
HP72T/YNU
0.35 [1.15']
HP96T/YNU
0.42 [1.38']
HP120T/YNU
0.50 [1.64']
35
40
45
chapter 2 -
31
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