Specifications
WR2SD-28
WR2-SERIES SYSTEM DESIGN (June 2010)
WR2-SERIES
SYSTEM DESIGN
3. PIPING DESIGN
Table3-2-3-1. Piping length limitation
3-2-3.
IF more than 16 ports are in use, or if there is more than one BC controller in use for two heat source units
(m [ft.])Table3-2-3-2. Bent equivalent length "M"
Item Piping in the figure Max. length Max. equivalent lengthHeat source Model
M (m/bends [ft./bends])
Total piping length F+G+H+A+B+C+D+E+a+b+c+d+e+f *1 - P144TSHMU,YSHMU
P168TSHMU,YSHMU
Farthest IU from HU F(G)+A+C+E+f 165 [541'] 190 [623']
Distance between HU and BC F(G)+A 110 [360'] *1 110 [360'] *1 P192TSHMU,YSHMU
Farthest IU from BC controller B+d or C+D+e or C+E+f 40 [131'] *2 40 [131'] *2 P216TSHMU,YSHMU
Height between HU and IU (HU above IU)H 50 [164' *5]-P240TSHMU,YSHMU
Height between HU and IU (HU under IU)H' 40 [131' *6]-
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 -
0.50 [1.64']
0.50 [1.64']
0.50 [1.64']
0.50 [1.64']
0.50 [1.64']
Distance between Main unit and Sub unitF+G or H5 [16']-
Height between Main unit and Sub unith4 0.1 [0.3']-
Fig. 3-2-3-2 Piping length and height between IU and BC controller
Table3-2-3-3. Piping "A"size selection rule (mm [in.])
Heat source ModelPipe(High pressure) Pipe(Low pressure)
P144TSHMU,YSHMU
ø22.20 [7/8"]
ø28.58 [1-1/8"]
P168TSHMU,YSHMU ø22.20 [7/8"]ø28.58 [1-1/8"]
P192TSHMU,YSHMU ø22.20 [7/8"]ø28.58 [1-1/8"]
P216TSHMU,YSHMU ø28.58 [1-1/8"] ø28.58 [1-1/8"]
P240TSHMU,YSHMU ø28.58 [1-1/8"] ø28.58 [1-1/8"]
Table3-2-3-4. Piping "B" size seleciton rule (mm [in.])
Total down-stream Indoor capacityPipe(Liquid) Pipe(Gas)
P54 or less ø9.52 [3/8"] ø15.88 [5/8"]
Table3-2-3-5. Piping "C", "D", "E" size selection rule (mm [in.])
Total down-stream Indoor capacityPipe(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 P168ø15.88 [5/8"]ø22.20 [7/8"]ø28.58 [1-1/8"]
HP : High pressure, LP:Low pressure
Table3-2-3-6. Piping "F", "G", "H" size selection rule(mm [in.])
Table3-2-3-7. Piping "a", "b", "c", "d"size selection rule (mm [in.])
Heat source Model Pipe(High pressure) Pipe(Low pressure)
Indoor Unit size Pipe(Liquid) Pipe(Gas)
P72THMU,YHMU ø15.88 [5/8"] ø19.05 [3/4"]
P06 to P18ø6.35 [1/4"] ø12.70 [1/2"]
P96THMU,YHMU ø19.05 [3/4"] ø22.20 [7/8"]
P24 to P54ø9.52 [3/8"] ø15.88 [5/8"]
P120THMU,YHMU ø19.05 [3/4"] ø28.58 [1-1/8"]
P72ø9.52 [3/8"] ø19.05 [3/4"]
P96ø9.52 [3/8"] ø22.20 [7/8"]
HU : Heat source Unit ; IU : Indoor Unit ; BC : BC controller
*1. Please refer to Fig.3-2-4
*2. Farthest Indoor from BC controller "
B+d or C+D+e or C+E+f " can exceed 40m(131ft.) till 60m(196ft.) if no Indoor sized P72, P96 connected.
Details refer to Fig.3-2-3-2
*3. Distance of Indoor sized P72, P96 from BC must be less than 10m(32ft.), if any.
*4. When using 2 Sub BC controllers, max. height "h3" should be considered.
BC controller (Main BC)
IU
a
IU
C
b
H
H'
h1
h1
IU IU
(P06-P18) (P24-P54) (P72-P96)
CMY-R160-J
(Joint)
IU
CMY-Y102S-G2
(Joint)
Max.3 sets for 1 port.
Total capacity < = P54
BC controller (Sub BC)
BC controller (Sub BC)
B
c d
IU
f
h3
D
E
Field supplied
A
IU
e
h1
F
H
h4
IU : Indoor unit
Heat source Twinning kit (High/Low press.)
CMY-Q100VBK
The Low press. kit must be placed in the heat source unit that has a larger capacity index
of the two, regardless of the relative positions of the heat source units or their addresses.
(If heat source units that have the same capacity are used in combination, the distributor
can be placed in either heat source unit.)
The High press. kit is to be installed in the field.
Main unit
Sub unit
Reducer (P06-P18)
(attached with BC controller)
G
h2
Fig. 3-2-3-1 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-J 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-GB, 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-HB 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 168,000BTUs.
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.