Specifications

WR2-SERIES SYSTEM DESIGN (June 2010)
WR2SD-27
WR2-SERIES
SYSTEM DESIGN
3. PIPING DESIGN
3-2-2. 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 3-2-2-1. Piping length limitation (m [ft.]) Table3-2-2-2. Bent equivalent length "M"
Item Piping in the figureMax. length Max. equivalent length Heat source Model M (m/bends [ft./bends])
Total piping length A+B+C+D+E+a+b+c+d+e+f *1 - P72THMU,YHMU 0.35 [1.15']
Farthest IU from HU A+C+E+f 165 [541'] 190 [623'] P96THMU,YHMU 0.42 [1.38']
Distance between HU and BC A110 [360'] *1 110 [360'] *1 P120THMU,YHMU 0.47 [1.54']
Farthest IU from BC controller B+d or C+D+e or C+E+f 40 [131'] *2 40 [131'] *2
Height between HU and IU (HU above IU)H 50 [164' *5]-
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 -
Fig. 3-2-2-2 Piping length and height between IU and BC controller Table3-2-2-3. Piping "A"size selection rule (mm [in.])
Heat source Model Pipe(High pressure) Pipe(Low pressure)
P72THMU,YHMU ø15.88 [5/8"] ø19.05 [3/4"]
P96THMU,YHMU ø19.05 [3/4"] ø22.20 [7/8"]
P120THMU,YHMU ø19.05 [3/4"] ø28.58 [1-1/8"]
Table3-2-2-4. Piping "B" size selection rule (mm [in.])
Total down-stream Indoor capacity Pipe(Liquid) Pipe(Gas)
P54 or less ø9.52 [3/8"] ø15.88 [5/8"]
Table3-2-2-5. Piping "C", "D", "E" 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
Table3-2-2-6
. Piping "a", "b", "c", "d" saize 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"]
HU : Heat source Unit ; IU : Indoor Unit ; BC : BC controlle
r
*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.3-2-2-2
*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
(P06-P18) (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
IU
(P24-P54)
D
E
Field supplied
A
IU
e
h1
HU : Heat source unit, IU : Indoor unit
HU
Reducer (P06-P18)
(attached with BC controller)
h2
Fig. 3-2-2-1 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-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.
Height difference between the main BC controller
and farthest indoor unit (m)
Pipe length between the main BC
controller and farthest indoor unit (m)
Height difference between the main BC controller
and farthest indoor unit (ft)
Pipe length between the main BC
controller and farthest indoor unit (ft)
0
10
20
30
40
50
60
70
0510 15
0
50
100
150
200
250
0510 15 20 25 30 35 40 45