146
OCH673D
Mixed Method
Connection Examples
(Connecting to 2 Branch boxes)
L2
L1
H
h2
H
h2
h1
h3
A
C
B
b
c
a
b
c
E
E
F
F
F
F
E
E
A
BB
A
D
C
C
j
i
k
D
d
e
g
f
h
F
F
F
F
D
A
Outdoor Unit
B
First joint
C
Branch header (CMY)
D
Branch box
E
CITY MULTI Indoor unit
F
M, S, P series Indoor unit
Permissible
length
(One-way)
Total piping length
A+B+C+D+E+a+b+c+d+e+f+g+h+i+j+k
[
240 m
*2
Farthest piping length (L1)
A+E+a
[
85 m
Farthest piping length. Via Branch box (L2)
A+B+C+k
[
80 m
Piping length between outdoor unit and branch boxes
A+B+C+D
[
55 m
Farthest piping length from the first joint
B+C or E+a
[
30 m
Farthest piping length after branch box
k
[
25m
Farthest branch box form outdoor unit
A+B+C
[
55m
Total piping length between branch boxes and indoor units d+e+f+g+h+i+j+k
[
95 m
Permissible
height
difference
(One-way)
In indoor/outdoor section (H)
*1
H
[
50 m (In the case of outdoor unit is set higher than indoor unit)
H
[
40 m (In the case of outdoor unit is set lower than indoor unit)
In branch box/indoor unit section (h1)
h1+h2
[
15 m
In each branch unit (h2)
h2
[
15 m
In each indoor unit (h3)
h3
[
12 m
Number of bends
[
15
*1
Branch box should be placed within the level between the outdoor unit and indoor units.
*2
When a cylinder unit or hydrobox is connected, the maximum piping length is 150 m.
■ Selecting the Refrigerant Branch Kit
Please select branching kit, which is sold separately, from the table below.
(The kit comprises sets for use with liquid pipes and for use with gas pipes.)
Branch header (4 branches)
Branch header (8 branches)
CMY-Y64-G-E
CMY-Y68-G-E
■
Select Each Section of Refrigerant Piping
(1) Section From Outdoor
Unit to Branch box or
Branch header (A to E)
Each
Section of
Piping
(2) Sections From Branch
box or Branch header to
Indoor Unit (a to k)
Select the size from the table to the right.
(1) Refrigerant Piping Diameter In Section From Outdoor Unit to Branch box or Branch header
(Out-door Unit Piping Diameter)
Model
Piping Diameter (mm)
PUMY-P112
PUMY-P125
PUMY-P140
Liquid Line
ø9.52
Gas Line
ø15.88
(2) Refrigerant Piping Diameter In Section From Branch box or Branch header to Indoor Unit
(Indoor Unit Piping Diameter)
Indoor unit series Model number A Liquid pipe (mm) B Gas pipe (mm)
CITY MULTI
– 50
ø6.35
ø12.7
63 –
ø9.52
ø15.88
M series or
S series
– 42
ø6.35
ø9.52
50
ø12.7
60
ø15.88
71 –
ø9.52
ø15.88
P series
– 50
ø6.35
ø12.7
60 –
ø9.52
ø15.88
Note:
When connecting the CONNECTION KIT (PAC-LV11M-J) and an M-series indoor unit, refer to the
installation manual for the CONNECTION KIT when selecting the pipe size and piping length.
■ Additional refrigerant charge
Refer to the same section in the previous page.
