193
S.D. WY
MEE15K036
3. Piping Design
SYSTEM DESIGN
Selection criteria for joints
Total down-stream Indoor capacity
Joint
~
P200
CMY-Y102SS-G2
P201 ~
P400
CMY-Y102LS-G2
P401 ~
P650
CMY-Y202S-G2
P651 ~
CMY-Y302S-G2
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 <=P200
<=P350
<=P600
* CMY-Y104-G can directly connect PQHY-P200YLM-A, but can NOT directly connect PQHY-P250YLM-A or above;
* CMY-Y108-G can directly connect PQHY-P200-350YLM-A, but can NOT directly connect PQHY-P400Y(S)LM-A
or above;
* CMY-Y1010-G can directly connect PQHY-P200-600Y(S)LM-A;
* 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
*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).
Heat source Twinning Kit
CMY-Y100VBK3
for PQHY-P400-600YSLM
CMY-Y200VBK2
for PQHY-P700-900YSLM
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 "M" x Number of bent.
H (HU above IU)
h1
H' (HU under IU)
h2
1st Joint
Joint
b
a
L2
L1
IU
IU
IU
IU
g
IU
e
IU
d
C
D
IU
f
E
T
S
A
B
Header
Capped
IU: Indoor unit , HU: Heat source unit
Fig. 3-2-2A Piping scheme
c
2m
To indoor unit
To indoor unit
To indoor unit
To indoor unit
2 m max
Trap (gas
pipe only)
Upward
incline
Downward
incline
Install the pipes from the heat source unit to the branch
joint with a downward incline.
If the length of pipe between the branch joint and heat source
unit exceeds 2 m, provide at rap at a distance 2 m or less
from the branch joint.
OK
NG
Piping "A" size selection rule
(mm [in.])
Heat source unit
Pipe(Liquid)
Pipe(Gas)
PQHY-P400-600YSLM
ø15.88 [5/8"]
ø28.58 [1-1/8"]
PQHY-P700-800YSLM
ø19.05 [3/4"]
ø34.93 [1-3/8"]
PQHY-P850-900YSLM
ø19.05 [3/4"]
ø41.28 [1-5/8"]
For Piping size "S","T", please refer to specification of the Twinning kit CMY-Y100VBK3,
CMY-Y200VBK2 at the Heat source unit's external drawing.
Bent equivalent length "M"
Heat source Model
M (m/bent [ft./bent])
PQHY-P400YSLM
0.50
[1.64]
PQHY-P450YSLM
0.50
[1.64]
PQHY-P500YSLM
0.50
[1.64]
PQHY-P550YSLM
0.50
[1.64]
PQHY-P600YSLM
0.50
[1.64]
PQHY-P700YSLM
0.70
[2.29]
PQHY-P750YSLM
0.70
[2.29]
PQHY-P800YSLM
0.70
[2.29]
PQHY-P850YSLM
0.80
[2.62]
PQHY-P900YSLM
0.80
[2.62]
Piping"B","C","D","E"size selection rule (mm
[in.])
Total down-stream Indoor capacity
Pipe(Liquid)
Pipe(Gas)
~ P140
ø9.52 [3/8"]
ø15.88 [5/8"]
P141 ~ P200
ø9.52 [3/8"]
ø19.05 [3/4"]
P201 ~ P300
ø9.52 [3/8"]
ø22.20 [7/8"]
P301 ~ P400
ø12.70 [1/2"]
ø28.58 [1-1/8"]
P401 ~ P650
ø15.88 [5/8"]
ø28.58 [1-1/8"]
P651 ~ P800
ø19.05 [3/4"]
ø34.93 [1-3/8"]
P801 ~
ø19.05 [3/4"]
ø41.28 [1-5/8"]
Piping "a","b","c","d","e","f","g" size selection rule (mm
[in.])
Indoor Unit size
Pipe(Liquid)
Pipe(Gas)
P15,P20,P25,P32,P40,P50,GUF-50RD(H) ø6.35 [1/4"]
ø12.70 [1/2"]
P63,P71,P80,P100,P125,P140,GUF-100RD(H) ø9.52 [3/8"]
ø15.88 [5/8"]
P200
ø9.52 [3/8"]
ø19.05 [3/4"]
P250
ø9.52 [3/8"]
ø22.20 [7/8"]
Heat source unit model
Joint model
P700 to P900
CMY-Y302S-G2
P400 to P600
CMY-Y202S-G2
See the table below for the first joint of
the heat source unit described below.
3-2-2. PQHY-P400-900YSLM Piping
Piping length (m [ft.])
Item
Piping in the figure
Max. length Max. equivalent length
Total piping length
S+T+A+B+C+D+E+a+b+c+d+e+f+g 500
[1640']
-
Distance between HU and HU
S+T
10[32']
-
Height between HU and HU
h2
0.1[0.3']
-
Farthest IU from HU (L1)
S(T)+A+C+D+E+g / S(T)+A+B+c 165 [541']
190 [623']
Farthest IU from the first Joint (L2)
C+D+E+g / B+c
40 [131']
40 [131']
Height between HU and IU (HU above IU) H
50
[164']
-
Height between HU and IU (HU under IU) H'
40
[131']
-
Height between IU and IU
h1
15 [49']
-
HU: Heat source Unit, IU: Indoor Unit
HU
HU
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