3. Piping Design
DATA U5
SYSTEM DESIGN
Syste
m H
3-2. Piping Design
Table3-2-1-6. R410A Joint selection rule
Total down-stream Indoor capacity
Joint
~
P72
CMY-Y102S-G2
P73 ~
P144
CMY-Y102L-G2
P145 ~
P234
CMY-Y202-G2
P235 ~
CMY-Y302-G2
*Concerning detailed usage of Joint parts, refer to its Installation Manual.
Table3-2-1-7. R410A Header selection rule
4-branch Header 8-branch Header 10-branch Header
CMY-Y104-G CMY-Y108-G CMY-Y1010-G
Total down-stream Indoor capacity <=P72 <=P144 <=P234
* CMY-Y104-G can directly connect PUHY-HP72THMU, but can NOT directly connect PUHY-HP96THMU or above;
* CMY-Y108-G can directly connect PUHY-HP72-144T(S)HMU, but can NOT directly connect PUHY-HP192TSHMU
* CMY-Y1010-G can directly connect PUHY-HP72-192T(S)HMU;
* CMY-Y104-G can NOT connect P72, P96 Indoor, but CMY-Y108, Y1010-G can do;
* Concerning detailed usage of Header parts, refer to its Installation Manual.
H
h
H'
The first joint
Joint
b
c
a
L2
L1
IU
IU
IU
IU
d
IU
IU
f
IU
e
C
D
A
OU
B
Header
Note1. No Joint after Header; Piping direct to Indoor Unit from Header;
Note2. If the A/C system is designed to use Cooling-mode under Outside temperature 10°C [50°F], H'<=40m [131ft.];
Note3. 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 = Actual piping "M" x Quantity of bent.
IU : Indoor unit , OU : Outdoor unit
g
Fig. 3-2-1A Piping scheme
3-2-1. PUHY-HP-72, 96THMU Piping
Table3-2-1-1. Piping length
(m [ft.])
Item
Piping in the figure
Max. length Max. equivalent length
Total piping length
A+B+C+D+a+b+c+d+e+f+g
300 [984']
-
Farthest IU from OU (L1)
A+C+D+g / A+B+d
150 [492']
175 [574']
Farthest IU from first Joint (L2)
C+D+g / B+d
40 [131']
40 [131']
Height between OU and IU (OU above IU) H 50
[164']
-
Height between OU and IU (OU under IU) H'
40
[131']
-
Height between IU and IU
h
15 [49']
-
OU: Outdoor Unit, IU: Indoor Unit
Table3-2-1-3. Piping "A" size selection rule (mm [in.])
Outdoor and the first Joint
Pipe(Liquid)
Pipe(Gas)
PUHY-HP72THMU=CMY-Y102S-G2
ø12.70 [1/2"]
ø19.05 [3/4"]
PUHY-HP96THMU=CMY-Y102L-G2
ø12.70 [1/2"]
ø22.20 [7/8"]
Table3-2-1-4. Piping "B","C","D"size selection rule
(mm [in.])
Total down-stream Indoor capacity
Pipe(Liquid)
Pipe(Gas)
~ P54
ø9.52 [3/8"]
ø15.88 [5/8"]
P55 ~ P72
ø9.52 [3/8"]
ø19.05 [3/4"]
P73 ~ P108
ø9.52 [3/8"]
ø22.20 [7/8"]
P109 ~ P144
ø12.70 [1/2"]
ø28.58 [1-1/8"]
P145 ~ P234
ø15.88 [5/8"]
ø28.58 [1-1/8"]
Table3-2-1-5. Piping "a","b","c","d","e","f","g"size selection rule (mm [in.])
Indoor Unit size
Pipe(Liquid)
Pipe(Gas)
P06,P08,P12,P15,P18
ø6.35 [1/4"]
ø12.70 [1/2"]
P24,P27,P30,P36,P48,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"]
Table3-2-1-2. Bent equivalent length "M"
Outdoor Model
M (m/bends [ft./bends])
PUHY-HP72THMU
0.30
[0.99]
PUHY-HP96THMU
0.35
[1.15]
Note4.
Indoor capacity is described as its model size;
For example, PDFY-P06NMU-E, its capacity is P06;
Note5.
Total down-stream Indoor capacity is the summary of the model size of Indoors downstream.
For example, PDFY-P06NMU-E+PDFY-P08NMU-E: Total Indoor capacity=P06+P08=P14
Note6.
Piping sized determined by the Total down-stream indoor capacity is NOT necessary
to be bigger than the up-stream one.
i.e. A>=B; A>=C>=D
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