128
OCH668G
10 REFRIGERANT PIPING TASKS
10-1. REFRIGERANT PIPING SYSTEM
Line-Branch Method
Connection Examples
(Connecting to 4 Indoor Units)
Liquid Pipe
Gas Pipe
Piping Diameter (mm)
Model
Liquid Pipe (mm)
Gas Pipe (mm)
ø15.88
ø9.52
Liquid Pipe
Gas Pipe
Piping Diameter (mm)
Model number
– 50
63 – 140
ø12.7
ø9.52
ø15.88
Outdoor Unit
First Branch
Indoor unit
A
B
C
A+B+C+a+b+c+d
[
120 m
A+B+C+d
[
70 m
B+C+d
[
50 m
H
[
50 m (If the outdoor unit is lower, H
[
30 m)
h
[
15 m
Use an optional branch piping kit (CMY-Y62-G-E).
Total Piping Length
Farthest Piping Length
Farthest Piping Length After First Branch
High/Low Difference in Indoor/Outdoor Section
High/Low Difference in Indoor/Indoor Section
Permissible
Length
Permissible High/
Low Difference
(L)
(
R
)
(H)
(h)
■
Selecting the Refrigerant Branch Kit
■
Select Each Section of Refrigerant Piping
■
Additional refrigerant charge
Select the size from the table to the right.
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch
(Outdoor Unit Piping Diameter)
(1) Section From Outdoor Unit
to First Branch (A)
(2) Section From Branch to
Indoor Unit (a, b, c, d)
(3) Section From Branch to
Branch (B, C)
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
(2) Refrigerant Piping Diameter In Section
From Branch to Indoor Unit
(Indoor Unit Piping Diameter)
Each
Section of
Piping
Refrigerant for the extended piping is not included in the
outdoor unit when the unit is shipped from the factory.
Therefore, charge each refrigerant piping system with
additional refrigerant at the installation site. In addition, in
order to carry out service, enter the size and length of each
liquid pipe and additional refrigerant charge amounts in
the spaces provided on the “Refrigerant amount” plate on
the outdoor unit.
Calculation of additional refrigerant charge
• Calculate the additional charge using the liquid pipe size
and length of the extended piping and total capacity of
connected indoor units.
• Calculate the additional refrigerant charge using the
procedure shown to the right, and charge with the
additional refrigerant.
• For amounts less than 0.1 kg, round up the calculated
additional refrigerant charge.
(For example, if the calculated charge is 6.01 kg, round up
the charge to 6.1 kg.)
ø9.52
ø15.88
PUMY-SP112
PUMY-SP125
PUMY-SP140
<Additional Charge>
Calculation of refrigerant charge
Pipe size
Liquid pipe
+
Pipe size
Liquid pipe
+
Total capacity of
connected indoor units
Amount for the
indoor units
ø6.35 mm
ø9.52 mm
–
8.0 kW
1.5 kg
(m)
×
19.0 (g/m)
(m)
×
50.0 (g/m)
8.1
–
16.0 kW
2.5 kg
16.1 kW
–
3.0 kg
Included refrigerant amount when shipped from the factory
Included refrigerant amount
40 ×
19.0
+ 45 ×
50.0
+ 3.0 = 6.1 kg (rounded up)
1000
1000
<Example>
Outdoor model : SP125
Indoor 1 : P63 (7.1 kW)
A : ø9.52 mm 20 m
B : ø9.52 mm
5 m
C : ø9.52 mm 5 m
a : ø9.52 mm
15 m
2 : P40 (4.5 kW)
b : ø6.35 mm
10 m
3 : P25 (2.8 kW)
c : ø6.35 mm
10 m
4 : P20 (2.2 kW)
d : ø6.35 mm
20 m
The total length of each liquid line is as follows:
ø9.52 : A + B + C + a = 20 + 5 + 5 + 15 = 45 m
ø6.35 : b + c + d = 10 + 10 + 20 = 40 m
The total capacity of connected indoor unit is as follows:
7.1 + 4.5 + 2.8 + 2.2 = 16.6
<Calculation example>
Additional refrigerant charge
At the conditions
below:
3.5 kg
Liquid Pipe
ø6.35
Gas Pipe
ø9.52
R
[
30 m
R > 30 m
B
A
A
H
B
C
L
R
d
a
h
b
c
C
C
C
C
Note:
• R indicates the piping length after the first
branch.
• 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.
