Mitsubishi Electric BDT CITY MULTI Installation And Pre-Commissioning Booklet page 19

3. Piping Design
3-2-2. PUHY-P400-900YSKB-A Piping
OU
OU
h2
T
S
1st Joint
Outdoor Twinning Kit
Fig. 3-2-1B Piping scheme
Piping length
e t I m
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 90m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*2 60m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*3 90m is available. When the piping length exceeds 40m, use one size larger liquid pipe starting with the section of piping where 40m
is exceeded and all piping after that point.
In the figure above, if the piping labeled "E" exceeds 40 meters (but does not exceed 90 meters), increase the size of the liquid piping labeled E, f, and g by one size.
*4 30m is available. If the height difference between indoor units exceeds 15 meters (but does not exceed 30 meters), use one-size larger pipes for indoor unit liquid pipes.
In the figure above, if "h1" exceeds 15 meters, increase the size of the liquid piping labeled C, D, E, and g by one size.
Piping "A" size selection rule
Outdoor unit Twinning kit
CMY-Y100VBK3
PUHY-P400YSKB
PUHY-P450-650YSKB CMY-Y100VBK3
PUHY-P700-800YSKB CMY-Y200VBK2
PUHY-P850-900YSKB CMY-Y200VBK2
For Piping size "S","T", please refer to specification of the Twinning kit CMY-Y100VBK3 at the Outdoor
unit's external drawing.
Piping"B","C","D","E" size selection rule
Total down-stream Indoor capacity
~ 1 P 0 4
1 P 1 4 ~ 2 P 0 0
2 P 1 0 ~ 3 P 0 0
3 P 1 0 ~ 4 P 0 0
4 P 1 0 ~ 6 P 0 5
6 P 1 5 ~ 8 P 0 0
8 P 1 0 ~
Piping"a","b","c","d","e","f","g" size selection rule
n I o d r o U t i n i s e z
P20,P25,P32,P40,P50,GUF-50RD(H)
P63,P71,P80,P100,P125,P140,GUF-100RD(H) ø9.52 [3/8"]
2 P 0 0
2 P 0 5
Note1. No Joint after Header; Piping direct to Indoor Unit from Header;
Note2. As bends cause pressure loss on transportation of refrigerant, fewer bends design is better;
Piping length needs to consider the actual length and equivalent length which bends are counted.
Equivalent piping length (m)=Actual piping length+"M" x Quantity of bends.
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
P p i n i i g t n e h i f u g e r M
S+T+A+B+C+D+E+a+b+c+d+e+f+g 1000 [3280']
S+T
h2
S(T)+A+C+D+E+g / S(T)+A+B+c 165 [541']
C+D+E+g / B+c
h1
(mm [in.])
Pipe(Liquid) Pipe(Gas)
ø12.7[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)
ø . 9 2 5 / 3 [ ] " 8 1 ø . 5 8 8 / 5 [ ] " 8
ø . 9 2 5 / 3 [ ] " 8 1 ø . 9 5 0 / 3 [ ] " 4
ø . 9 2 5 / 3 [ ] " 8 2 ø . 2 0 2 / 7 [ ] " 8
1 ø . 2 0 7 / 1 [ ] " 2 2 ø . 8 8 5 1 [ / 1 -
1 ø . 5 8 8 / 5 [ ] " 8 2 ø . 8 8 5 1 [ / 1 -
1 ø . 9 5 0 / 3 [ ] " 4 3 ø . 4 3 9 1 [ / 3 -
1 ø . 9 5 0 / 3 [ ] " 4 4 ø . 1 8 2 1 [ / 5 -
(mm [in.])
i P e p i L ( u q ) d i i P e p G ( a ) s
ø6.35 [1/4"] ø12.70 [1/2"]
ø15.88 [5/8"]
ø . 9 2 5 / 3 [ ] " 8 1 ø . 9 5 0 / 3 [ ] " 4
ø . 9 2 5 / 3 [ ] " 8 2 ø . 2 0 2 / 7 [ ] " 8
NG
2m
T i o d n o o u r t i n
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.]) Bent equivalent length "M"
a . x e l g n h t
Max. equivalent length Outdoor unit model
- PUHY-P400YSKB-A
10[32'] - PUHY-P450YSKB-A
0.1[0.3'] - PUHY-P500YSKB-A
190 [623'] PUHY-P550YSKB-A
40 [131'] *3 40 [131'] PUHY-P600YSKB-A
50 [164'] *1 - PUHY-P650YSKB-A
40 [131'] - PUHY-P700YSKB-A
*2
15 [49'] *4 - PUHY-P750YSKB-A
PUHY-P800YSKB-A
PUHY-P850YSKB-A
PUHY-P900YSKB-A
Selection criteria for joints
Total down-stream Indoor capacity
~ P200
P201 ~ P400
P401 ~ P650
P651 ~
*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 650 or below.
If the total capacity of the units in the downstream of the branch joints on both lines is 650 or above use
two branch joints (CMY-Y302S-G2).
See the table below for the first joint of
the outdoor unit described below.
Outdoor unit model Joint model
P450 to P650 CMY-Y202S-G2
P700 to P900 CMY-Y302S-G2
Header selection rule
4-branch Header 8-branch Header 10-branch Header
] " 8
CMY-Y104-G
] " 8
Total down-stream Indoor capacity <=P200
] " 8
* CMY-Y104-G can directly connect PUHY-P200YKB, but can NOT directly connect PUHY-P250YKB or above;
] " 8
* CMY-Y108-G can directly connect PUHY-P200-450Y(S)KB, but can NOT directly connect PUHY-P500YSKB or above;
* CMY-Y1010-G can directly connect PUHY-P200-600Y(S)KB;
* 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, 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+PEFY-P32VMA-E: 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
AN1 2nd
Trap (gas
pipe only)
To indoor unit To indoor unit
2 m m x a
Capped
c
IU
g
IU
IU : Indoor unit , OU : Outdoor unit
M (m/bent [ft./bent])
0.50 [1.64]
0.50 [1.64]
0.50 [1.64]
0.50 [1.64]
0.50 [1.64]
0.50 [1.64]
0.70 [2.29]
0.70 [2.29]
0.70 [2.29]
0.80 [2.62]
0.80 [2.62]
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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