Mitsubishi Electric CITY MULTI PUHY-P72-432TNU-A Data Book page 187

12. PIPING DESIGN
12-2-3. PUHY-P264-432TSNU/YSNU Piping
OU OU
OU
h2
M N
T
S
1st Outdoor
Twinning Kit
CMY-Y300CBK2
1st joint
2nd Outdoor
Twinning Kit
CMY-Y300CBK2
Fig. 12-2-1C Piping scheme
Piping length
Item
Total piping length
Distance between OU and OU
Height between OU and OU
Farthest IU from OU (L1)
Farthest IU from the 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
*1 90 m [295 ft.] is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*2 60 m [197 ft.] is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*3 90 m [295 ft.] is available. When the piping length exceeds 40m [131ft], use one size larger liquid pipe starting with the section of piping where 40m [131ft] is exceeded and all piping after that point.
In the figure above, if the piping labeled "E" exceeds 40m [131ft] (but does not exceed 90 m [295 ft.]), increase the size of the liquid piping labeled E, f, and g by one size.
*4 30 m [98 ft.] is available. If the height difference between indoor units exceeds 15 m [49 ft.] (but does not exceed 30 m [98 ft.]), use one-size larger pipes for indoor unit liquid pipes.
In the figure above, if "h1" exceeds 15 m [49 ft.], increase the size of the liquid piping labeled g by one size.
Table1. Piping "A" size selection rule
Outdoor unit
PUHY-P264-312TSNU/YSNU
PUHY-P336-432TSNU/YSNU
For Piping size"M","N","S","T", please refer to specification of the Twinning kit CMY-Y300CBK2 at
the Outdoor unit's external drawing.
Table2. Piping"B","C","D","E" size selection rule
Total down-stream Indoor capacity
~ P54
P55 ~ P72
P73 ~ P108
P109 ~ P144
P145 ~ P240
P241 ~ P308
P309 ~
Table3. Piping"a","b","c","d","e","f","g" size selection rule
Indoor Unit size
P04 ~ P18
P24 ~ P54
P72
P96
MEES23K040
Note1. No joint after Header; Piping direct to Indoor Unit from Header;
Note2. 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.
OK
To indoor unit
Downward
incline
Install the pipes from the outdoor unit to the branch
joint with a downward incline.
A
C
D
d
Joint
IU
Piping in the figure Max. length Max. equivalent length
S+T+M+N+A+B+C+D+E+a+b+c+d+e+f+g 1000[3280]
M+N+S+T
h2
M(N)+S+A+C+D+E+g / M(N)+S+A+B+c 165[541]
C+D+E+g / B+c
h1
Twinning kit Pipe(Liquid) Pipe(Gas)
CMY-Y300CBK2 ø19.05[3/4] ø34.93[1-3/8]
ø19.05[3/4] ø41.28[1-5/8]
CMY-Y300CBK2
(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)
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]
NG
To indoor unit
Upward
incline
If the length of pipe between the branch joint and outdoor
unit exceeds 2 m, provide at rap at a distance 2 m or less
from the branch joint.
Header
B
a b
IU IU
L1
L2
E
e f
IU IU
(m [ft.]) Bends equivalent length "M"
Outdoor Model
- PUHY-P264T/YSNU
10[32] - PUHY-P288T/YSNU
0.1[0.3] - PUHY-P312T/YSNU
190[623] PUHY-P336T/YSNU
40[131] *3 40[131] PUHY-P360T/YSNU
50[164] *1 - PUHY-P384T/YSNU
40[131] *2 - PUHY-P408T/YSNU
15[49] *4 - PUHY-P432T/YSNU
(mm [in.]) Table4-1. Selection criteria for joints
Total down-stream Indoor capacity
~ P72
P73 ~ P144
P145 ~ P240
P241 ~
*Concerning detailed usage of joint parts, refer to its Installation Manual.
*The total capacity of the units in the downstream of the branch joint on at least one of
the piping lines that are connected to the branch joint should be 240 or below.
If the total capacity of the units in the downstream of the branch joints on both lines is
above 240 use two branch joints (CMY-Y302S-G2).
Table4-2.
See the table below for the first joint of
the outdoor unit described below.
Outdoor unit model
P264 to P432
Table5. Header selection rule
4-branch Header 8-branch Header 10-branch Header
CMY-Y104C-G
Total down-stream Indoor capacity <=P72
* CMY-Y104C-G can directly connect PUHY-P72T/YNU, but can NOT directly connect PUHY-P96T/YNU or above;
* CMY-Y108C-G can directly connect PUHY-P72~168T/YNU, but can NOT directly connect PUHY-P192T/YSNU or above;
* CMY-Y1010C-G can directly connect PUHY-P72~240T/Y(S)NU;
* CMY-Y104C-G can NOT connect P72~P96 Indoor, but CMY-Y108,Y1010C-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-P06NMAU-E3, its capacity is P06;
Note4. Total down-stream Indoor capacity is the summary of the model size of Indoors downstream.
For example, PEFY-P06NMAU-E3+PEFY-P08NMAU-E3: Total Indoor capacity=P06+P08=P14
Note5. Piping size 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
Trap (gas
pipe only)
To indoor unit To indoor unit
2m 2 m max
Capped
c
IU
g
IU
IU: Indoor unit , OU: Outdoor unit
M (m/bent [ft./bent])
0.80 [2.62]
0.80 [2.62]
0.80 [2.62]
0.80 [2.62]
0.80 [2.62]
0.80 [2.62]
0.80 [2.62]
0.80 [2.62]
Joint
CMY-Y102SS-G2
CMY-Y102LS-G2
CMY-Y202S-G2
CMY-Y302S-G2
Joint model
CMY-Y302S-G2
CMY-Y108C-G CMY-Y1010C-G
<=P144 <=P240
Y-Series
184