3-2.Piping Design - Mitsubishi Electric CITY MULTI PEFY-P22VMS-E-S Data Book

3. Piping Design
3-2. Piping Design
3-2-1. PUHY-P300-450YRJC-A Piping
OU
A
1st Joint
Fig. 3-2-1A Piping scheme
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
Piping "A" size selection rule
Outdoor and the first Joint
PUHY-P300YRJC=CMY-Y102SS-G2
PUHY-P350YRJC=CMY-Y102SS-G2
PUHY-P400YRJC=CMY-Y202S-G2
PUHY-P450YRJC=CMY-Y202S-G2
*1. A>=40m [131ft.], ø12.70mm [1/2in.] ; A<40m [131ft.], ø9.52mm [3/8in.]
Piping"B","C","D","E"size selection rule
Total down-stream Indoor capacity
~ P140
P141 ~ P200
P201 ~ P300
P301 ~ P400
P401 ~ P650
P651 ~ P800
P801 ~
Piping "a","b","c","d","e","f","g" size selection rule
Indoor Unit size
P15,P20,P25,P32,P40,P50,GUF-50RDH ø6.35 [1/4"]
P63,P71,P80,P100,P125,P140
P200
P250
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, H'(OU under IU)
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 (m)=Actual piping length+"M" x Quantity of bent.
B
L1
C
L2
D E
Joint
d e
IU IU
Piping in the figure Max. length
A+B+C+D+E+a+b+c+d+e+f+g 300 [984']
A+C+D+E+g / A+B+c 120 [394']
C+D+E+g / B+c 40 [131']
50 [164']
40 [131']
h1
(mm [in.])
Pipe(Liquid) Pipe(Gas)
ø9.52 [3/8"] *1 ø22.20 [7/8"]
ø12.70 [1/2"] ø28.58 [1-1/8"]
ø12.70 [1/2"] ø28.58 [1-1/8"]
ø15.88 [5/8"] ø28.58 [1-1/8"]
(mm [in.])
Pipe(Liquid) Pipe(Gas)
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"]
ø19.05 [3/4"] ø34.93 [1-3/8"]
ø19.05 [3/4"] ø41.28 [1-5/8"]
(mm [in.])
Pipe(Liquid) Pipe(Gas)
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
a
IU
g
f
IU IU
(m [ft.]) Bent equivalent length "M"
Max. equivalent length Outdoor unit model
- PUHY-P300YRJC-A
145 [476'] PUHY-P350YRJC-A
40 [131'] PUHY-P400YRJC-A
- PUHY-P450YRJC-A
-
15 [49'] -
Joint selection rule
Total down-stream Indoor capacity
~ P200
P201 ~ P400
P401 ~ P650
P651 ~
*PUHY-P450YRJC's first Joint is always CMY-Y202S-G2;
*Concerning detailed usage of Joint parts, refer to its Installation Manual.
Header selection rule
4-branch Header 8-branch Header 10-branch Header
CMY-Y104-G
Total down-stream Indoor capacity <=P200
* CMY-Y108-G can directly connect PUHY-P300-450YRJC;
* CMY-Y1010-G can directly connect PUHY-P300-450YRJC;
* CMY-Y104-G can NOT connect P200,P250 Indoor, but CMY-Y108, Y1010-G can do;
* Concerning detailed usage of Header parts, refer to its Installation Manual.
Note3. Indoor capacity is described as its model size;
For example, PEFY-P32VMA-E-S, its capacity is P32;
Note4. Total down-stream Indoor capacity is the summary of the model size of Indoors downstream.
For example, PEFY-P25VMA-E-S+PEFY-P32VMA-E-S: Total Indoor capacity=P25+P32=P57
Note5. 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
C7-R Rev.
< =
4m
Header
Capped
b c
IU IU
IU : Indoor unit , OU : Outdoor unit
M (m/bent [ft./bent])
0.42 [1.38]
0.47 [1.54]
0.50 [1.64]
0.50 [1.64]
Joint
CMY-Y102SS-G2
CMY-Y102LS-G2
CMY-Y202S-G2
CMY-Y302S-G2
CMY-Y108-G CMY-Y1010-G
<=P400 <=P650
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