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349
1. Piping Design
P04-P18
P24-P54
Piping "L", "M", "N" size selection rule (mm [in.])
Heat source Model Pipe(High pressure)
Pipe(Low pressure)
P72ZLMU
ø15.88 [5/8"]
ø19.05 [3/4"]
P96ZLMU
ø19.05 [3/4"]
ø22.20 [7/8"]
P120ZLMU
P144ZLMU
ø19.05 [3/4"]
ø22.20 [7/8"]
P168ZLMU
ø22.20 [7/8"]
ø28.58 [1-1/8"]
ø22.20 [7/8"]
ø28.58 [1-1/8"]
Piping "B", "C", "D", "E" size seleciton rule
(mm [in.])
P55-P72
ø9.52 [3/8"]
ø19.05 [3/4"]
P73-P96
ø9.52 [3/8"]
ø22.20 [7/8"]
Piping "F", "G", "J", "K" 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"]
P181 to P234
ø15.88 [5/8"]
ø28.58 [1-1/8"]
ø28.58 [1-1/8"]
P235 to P288
ø19.05 [3/4"]
ø28.58 [1-1/8"]
ø34.93 [1-3/8"]
P289 to P360
ø19.05 [3/4"]
ø28.58 [1-1/8"]
ø41.28 [1-5/8"]
P361 or above
ø19.05 [3/4"]
ø34.93 [1-3/8"]
ø41.28 [1-5/8"]
HP: High pressure, LP: Low pressure
Piping "a", "b", "c", "d", "e", "f", "g", "i", "j", "k", "m", "n" size selection rule
(mm [in.])
Indoor Unit size
Pipe(Liquid)
Pipe(Gas)
ø6.35 [1/4"]
ø12.70 [1/2"]
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"]
Total down-stream Indoor capacity
Pipe(Liquid)
Pipe(Gas)
P54 or less
ø9.52 [3/8"]
ø15.88 [5/8"]
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 P180
ø15.88 [5/8"]
ø22.20 [7/8"]
ø28.58 [1-1/8"]
Selection criteria for joints_A
P73-P96 CMY-Y102LS-G2
Total down-stream Indoor capacity
Joint
-P72
CMY-Y102SS-G2
Selection criteria for joints_B
P361-
CMY-R205S-G
Total down-stream Indoor capacity
Joint
CMY-R204S-G
P217-P240
P241-P360
P121-P216
CMY-R203S-G
CMY-R202S-G
-P120
CMY-R201S-G
Piping length and height between IU and BC controller
Fig. 2
Fig. 3
*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.
The maximum liquid branch pipe diameter is ø19.05. If a given system already has a ø19.05-pipe
between the main BC and sub BC, there is no need to increase the pipe 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.
*12. 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 "A"size selection rule
(mm [in.])
Heat source Model
Pipe(High pressure) Pipe(Low pressure)
P144-192ZSLMU
ø22.20 [7/8"]
ø28.58 [1-1/8"]
P216ZSLMU
ø22.20 [7/8"] *12
ø28.58 [1-1/8"]
P240ZSLMU
ø22.20 [7/8"] *12
ø34.93 [1-3/8"]
P288-312ZSLMU
ø28.58 [1-1/8"]
ø34.93 [1-3/8"]
P336ZSLMU
ø28.58 [1-1/8"]
ø41.28 [1-5/8"]
IU
Fig. 2
Fig. 2
Fig. 3
Main
BC
Fig. 2
Fig. 3
IU
IU
SUB
BC
SUB
BC
Height difference between Main BC controller
and farthest indoor unit (ft)
P
ipe length between Main BC
controller and indoor unit (ft)
0
50
100
150
200
250
0
5
10
15
20
25
30
35
40
45
Height difference between Main BC controller
and farthest indoor unit (ft)
P
ipe length between Main BC controller
,
Sub BC controller
, and indoor unit (ft)
0
50
100
150
250
200
300
0
5
10
15
20
25
30
35
40
45
*9
0000005757.BOOK 349 ページ ２０２０年２月２８日 金曜日 午後１時４４分
