3-2.Piping Design - Mitsubishi Electric CITY MULTI H Series Manual

3. Piping Design
3-2. Piping Design
3-2-1. PUHY-HP-72, 96THMU Piping
OU
A
The first joint
Fig. 3-2-1A Piping scheme
Table3-2-1-1. Piping length
Item
Total piping length
Farthest IU from OU (L1)
Farthest IU from first Joint (L2)
Height between OU and IU (OU above IU) H
Height between OU and IU (OU under IU) H'
Height between IU and IU
OU: Outdoor Unit, IU: Indoor Unit
Table3-2-1-3. Piping "A" size selection rule
Outdoor and the first Joint
PUHY-HP72THMU=CMY-Y102S-G2
PUHY-HP96THMU=CMY-Y102L-G2
Table3-2-1-4. Piping "B","C","D"size selection rule
Total down-stream Indoor capacity
~ P54
P55 ~ P72
P73 ~ P108
P109 ~ P144
P145 ~ P234
Table3-2-1-5. Piping "a","b","c","d","e","f","g"size selection rule
Indoor Unit size
P06,P08,P12,P15,P18
P24,P27,P30,P36,P48,P54
P72
P96
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 length + "M" x Quantity of bent.
C
D
e
f
Joint
IU IU
Piping in the figure Max. length
A+B+C+D+a+b+c+d+e+f+g 300 [984']
A+C+D+g / A+B+d 150 [492']
C+D+g / B+d 40 [131']
50 [164']
40 [131']
h 15 [49']
(mm [in.])
Pipe(Liquid) Pipe(Gas)
ø12.70 [1/2"] ø19.05 [3/4"]
ø12.70 [1/2"] ø22.20 [7/8"]
(mm [in.])
Pipe(Liquid) Pipe(Gas)
ø9.52 [3/8"] ø15.88 [5/8"]
ø9.52 [3/8"] ø19.05 [3/4"]
ø9.52 [3/8"] ø22.20 [7/8"]
ø12.70 [1/2"] ø28.58 [1-1/8"]
ø15.88 [5/8"] ø28.58 [1-1/8"]
(mm [in.])
Pipe(Liquid) Pipe(Gas)
ø6.35 [1/4"] ø12.70 [1/2"]
ø9.52 [3/8"] ø15.88 [5/8"]
ø9.52 [3/8"] ø19.05 [3/4"]
ø9.52 [3/8"] ø22.20 [7/8"]
SYSTEM DESIGN
Header
B
a b
IU IU
L1
L2
(m [ft.]) Table3-2-1-2. Bent equivalent length "M"
Max. equivalent length Outdoor Model
- PUHY-HP72THMU
175 [574'] PUHY-HP96THMU
40 [131']
-
-
-
Table3-2-1-6. R410A Joint selection rule
Total down-stream Indoor capacity
~ P72
P73 ~ P144
P145 ~ P234
P235 ~
*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
Total down-stream Indoor capacity <=P72
* 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.
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
DATA U5
d
c
IU
IU
g
IU
IU : Indoor unit , OU : Outdoor unit
M (m/bends [ft./bends])
0.30 [0.99]
0.35 [1.15]
Joint
CMY-Y102S-G2
CMY-Y102L-G2
CMY-Y202-G2
CMY-Y302-G2
CMY-Y108-G CMY-Y1010-G
<=P144 <=P234
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