Specifications

WR2SD-26
WR2-SERIES SYSTEM DESIGN (June 2010)
WR2-SERIES
SYSTEM DESIGN
3. PIPING DESIGN
3-2. Piping Design
3-2-1.
IF 16 ports or less are in use, I.e., if only one BC controller is in use with no sub BC controller.r
Table
3-2-1-1
. Piping length limitation Table3-2-1-2. Bends equivalent length "M"
Item Piping in the figure Max. length Max. equivalent length Heat source Model M (m/bends [ft./bends])
Total piping length A+B+a+b+c+d*1-P72THMU,YHMU 0.35 [1.15']
Farthest IU from HU A+B+d 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 40 [131'] *2
40 [131'] *2
Height between HU and IU (HU above IU)H 50 [164'] -
Height between HU and IU (HU under IU)H'
40 [131'] -
Height between IU and BC h1
15 [49'] (10 [32']) *3
-
Height between IU and IU h2 15 [49'] (10 [32']) *3 -
Table3-2-1-3. Piping "A"size selection rule (mm [in.])
(m [ft.])
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"]
Table3-2-1-4. Piping "B" size seleciton rule (mm [in.])
Total down-stream Indoor capacity Pipe(Liquid) Pipe(Gas)
P54 or less ø9.52 [3/8"] ø15.88 [5/8"]
Table3-2-1-5. Piping "a", "b", "c", "d" size 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 controller
*1. Please refer to Fig.3-2-4
*2. Farthest Indoor from BC controller "B+d" can exceed 40m(131ft.) till 60m(196ft.) if no Indoor sized P72, P96 connected. Details refer to Fig.3-2-1-2
*3. Distance of Indoor sized P72, P96 from BC must be less than 10m(32ft.), if any.
(P72-P96)
BC controller
a
b
H
H'
h1
IU
(P06-P18)
IU
(P24-P54)
CMY-R160-J
(Joint)
IU
CMY-Y102S-G2
(Joint)
Max.3 sets for 1 port.
Total capacity <= P54
B
c
d
IU
A
HU
Reducer (P06~P18)
(attached with BC controller)
IU
h2
For heat source units equal to or larger than a size P120, on
the BC controller please ensure CMB-P•NU-GA is used.
Fig. 3-2-1-1 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. 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.
Fig. 3-2-1-2 Piping length and height between IU and BC controller
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
*4
*5