124
OCH634C
Branch box Method
Connection Examples
(Connecting to 8 Indoor Units)
Permissible
length
(One-way)
Total piping length
A + B + C + a + b + c + d + e + f + g + h
[
150 m
Farthest piping length (L)
A + C + h
[
80 m
Piping length between outdoor unit and branch boxes
A + B + C
[
55 m
Farthest piping length after branch box (1)
l
[
25 m
Total piping length between branch boxes and indoor units
a + b + c + d + e + f + g + h
[
95 m
Permissible
height
difference
(One-way)
In indoor/outdoor section (H)*
1
H
[
50 m (In case of that outdoor unit is set higher than indoor unit)
H
[
40 m (In case of that 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.
■ Select Each Section of Refrigerant
Piping
(1) Section From Outdoor Unit
to Branch box (A, B, C)
Each
Section of
Piping
(2) Sections From Branch box
to Indoor Unit (a to h)
Select the size from the table to the
right.
(1) Refrigerant Piping Diameter In Section From Outdoor Unit to First Branch (Out- door Unit Piping Diameter)
L: The farthest piping length from the outdoor unit to an indoor unit.
(2) Refrigerant Piping Diameter In Section From Branch box to Indoor Unit (Indoor Unit Piping Diameter)
Indoor unit series
kW type
A Liquid pipe
B Gas pipe
M series or
S series
15–42
ø6.35 mm
ø9.52 mm
50
ø6.35 mm
ø12.7 mm
60
ø6.35 mm
ø15.88 mm
71
ø9.52 mm
ø15.88 mm
P series
35–50
ø6.35 mm
ø12.77 mm
60–100
ø9.52 mm
ø15.88 mm
■ Additional refrigerant charge
Refer to the same section in the previous page.
A
B
C
h2
H
A
Outdoor unit
B
Branching joint
C
Branch box
D
Indoor unit
a
b
d
c
e
f
g
h
l
h2
H
h1
h3
C
A
B
C
D
D
D
D
D
D
D
D
L
Model
Piping Diameter (mm)
PUMY-P200
Liquid Line
L
[
20 m
ø9.52
L > 20 m
ø12.7
Gas Line
ø19.05
