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Mixed Method
Connection Examples
(Connecting to 1 Branch box)
Total piping length
Farthest piping length (L1)
Farthest piping length. Via Branch box (L2)
Permissible
Piping length between outdoor unit and branch box
length
(One-way)
Farthest piping length from the first joint
Farthest piping length after branch box
Total piping length between branch boxes and indoor units
In indoor/outdoor section (H)*
Permissible
height
difference
In branch box/indoor unit section (h1)
(One-way)
In each indoor unit (h3)
Number of bends
*
1
Branch box should be placed within the level between the outdoor unit and indoor units.
■
Selecting the Refrigerant Branch Kit
■
Select Each Section of Refrigerant Piping
(1) Section From Outdoor Unit
to Branch box or Branch
header (A to E)
(2) Sections From Branch
box or Branch header to
Indoor Unit (a to j)
Select the size from the table to the right.
■
Additional refrigerant charge
OCH576
L1
C
b
a a
E
E
A+B+C+D+E+a+b+c+d+e+f+g+h+i+j ≦300 m
A+E+a or A+B+C+e ≦ 85 m
A+B+C+D+j ≦ 80 m
A+B+C+D ≦ 55 m
B+C+D or B+C+e≦ 30 m
j ≦ 25 m
f+g+h+i+j ≦ 95 m
1
H ≦ 50 m (In case of outdoor unit is set higher than indoor unit)
H ≦ 40 m (In case of outdoor unit is set lower than indoor unit)
h1 ≦ 15 m
h3 ≦ 12 m
≦ 12 m
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)
CMY-Y64-G-E
(1) Refrigerant Piping Diameter In Section From Outdoor Unit to Branch box or Branch
header (Out-door Unit Piping Diameter)
Model
Each
PUMY-P112
Section of
PUMY-P125
PUMY-P140
Piping
(2) Refrigerant Piping Diameter In Section From Branch box or Branch header to
Indoor Unit (Indoor Unit Piping Diameter)
Indoor unit series
CityMulti
M series or
S series
P series
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.
Refer to the same section in the previous page.
141
A
L2
A
B
E
B
C
D
C
d
e
f
f
g
g
E
E
E
F
F
Branch header (8 branches)
CMY-Y68-G-E
Piping Diameter (mm)
Liquid Line
{9.52
Gas Line
{15.88
Model number A Liquid pipe
15 to 50
{6.35
63 to 140
{9.52
15 to 42
{6.35
50
{6.35
60
{6.35
71 to 80
{9.52
35,50
{6.35
60 to 100
{9.52
A Outdoor Unit
B First joint
C Branch header (CMY)
D Branch box (PAC-MK30/50)
E CityMulti Indoor unit
F M/S/P series Indoor unit
D
h
h
i
i
j
j
F
F
F
B Gas pipe
{12.7
{15.88
{9.52
{12.7
{15.88
{15.88
{12.7
{15.88
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