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(2) WCB piping design
WCB
A
C
D
E
d
e
f
g
Header branch
a
b
c
B
H H1
h1
h2
Capped
Line branch
0
10
20
30
40
50
60
70
0
5
10
15
Height difference between WCB
and farthest indoor unit (m)
Pipe length between WCB an
d
fa
rthest indoor unit (m)
*1. Refer to Fig. (2)-1 "Restrictions on piping length" .
*2. Please refer to Fig. (2)-2 "Distance between WCB and farthest Indoor unit" when the distance between WCB controller and farthest indoor unit exceeds 40 m.
(Not applicable to the P250 model indoor unit).
*3. The values in the parenthesis show the maximum piping length when the capacity of the connected indoor unit is 200 or more.
NOTE:
Joint branching is not possible after header branching.
Cover the unused branch using the optional cover cap (CMY-S202-J).
Top-bottom differential 90m(OU above IU) or 60m(OU below IU) is not available.
PQRY-P200,250,300YHM-A
OU
IU
IU
IU
AU
BU
AU
AU
L1
L2
(Header branch
possible)
(Line branch
possible)
Indoor/
PWFY branch
PWFY branch
Piping in the figure
Maximum length
A+B+C+D+E+a+b+c+d+e+f+g
*1
A+C+D+E+g / A+B+c
165 m
(Max. equivalent length of 190 m or less)
0
1
1
A
C+D+E+g / B+c
40
*2
0
5
H
U
I
e
v
o
b
a
U
O
0
4
1
H
U
I
w
o
l
e
b
U
O
h1
15 (10)
*3
h2
15 (10)
*3
Item
Total piping length
Farthest IU from OU
Distance between OU and WCB
Distance between IU and WCB
Height between IU and OU
Height between IU and WCB
Height between indoor units
Fig.(2)-1 Restrictions on piping length
Fig.(2)-2 Distance between WCB and fartherest indoor unit
Table (2)-1. Piping "B", "C", "D", "E" size selection rule (mm)
(mm)
Total capacity of indoor units
Liquid pipe
Gas pipe
-140
ø9.52
ø15.88
14 - 200
ø9.52
ø19.05
201 - 300
ø9.52
ø22.2
301 - 400
ø12.7
ø28.58
401 -
ø15.88
ø28.58
Table (2)-2. Piping "a", "b", "c", "d", "e", "f", "g" size selection rule
Model number
Liquid pipe
Gas pipe
20,25,32,40,50
ø6.35
ø12.7
63,71,80,100,125,140
ø9.52
ø15.88
200
ø9.52
ø19.05
250
ø9.52
ø22.2
Table (2)-3. Selection rule for branch pipe (joint)
Downstream unit model total
Joint
-200
CMY-Y102S-G2
201 - 400
CMY-Y102L-G2
401 -
CMY-Y202-G2
Table (2)-4. Selection rule for branch pipe (header)
4-Branching header
(Downstream unit
model total 200)
8-Branching header
(Downstream unit
model total 400)
10-Branching header
(Downstream unit
model total 650)
CMY-Y104-G
CMY-Y108-G
CMY-Y1010-G
200
300
400
500
600
700
800
900
1000
10 20 30 40 50 60 70 80 90 100 110
Piping length between outdoor unit and WCB(m)
Total piping length(m)
PURY-(E)P200,250YLM-A(1)
PURY-(E)P300, 350YLM-A(1)
Distance between outdoor unit and WCB(m)
Distance between outdoor unit and WCB(m)
200
300
400
500
600
700
800
900
1000
10 20 30 40 50 60 70 80 90 100 110
To
ta
l extended pipe length
(m)
200
300
400
500
600
700
800
900
1000
10 20 30 40 50 60 70 80 90 100 110
To
ta
l extended pipe length
(m)
