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10
REFRIGERANT PIPING TASKS
10-1. REFRIGERANT PIPING SYSTEM
Line-Branch Method
Connection Examples
(Connecting to 5 Indoor Units)
Total Piping Length
Permissible
Farthest Piping Length
Length
Farthest Piping Length After First Branch
High/Low Difference in Indoor/Outdoor Section
Permissible High/
Low Difference
High/Low Difference in Indoor/Indoor Section
■
Selecting the Refrigerant Branch Kit
■
Select Each Section of Refrigerant Piping
(1) Section From Outdoor Unit
to First Branch (A)
(2) Sections From Branch to
Indoor Unit (a,b,c,d,e)
(3) Section From Branch to
Branch (B,C,D)
Select the size from the table to the right.
■ Additional refrigerant charge
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.
• 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 15.92 kg,
round up the charge to 16.0 kg.)
• The amount of additional refrigerant which is
calculated from the total capacity of indoor units and
the combination of extended pipes must not be over
22.8 kg.
(Refer to 2-1 for the capacity of indoor units, and
above for extended piping.)
OCH760
A+B+C+D+a+b+c+d+e [ 310 m
(L)
A+B+C+D+e [ 150 m
(R)
B+C+D+e [ 30 m
H [ 50 m (If the outdoor unit is lower, H [ 40 m)
(H)
h [ 15 m
(h)
Use an optional branch piping kit (CMY-Y62-G-E).
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch
(Outdoor Unit Piping Diameter)
A
Model
Each
Section of
L [ 90 m
P250
L > 90 m
Piping
P300
All
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
B, C, D
Total down-stream capacity of indoor units Liquid Pipe Gas Pipe
- 16.0 kW
16.1 - 22.4 kW
22.5 - 36.4 kW
36.5 kW -
L: The farthest piping length from the outdoor unit to an indoor unit.
* ø12.7 when connecting the indoor unit for PEFY-P200 or P250.
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
charge>
Pipe size
Liquid pipe
ø6.35
(m) × 19.0 (g/m)
Included refrigerant amount when shipped from the factory
Included refrigerant amount
9.3 kg
Calculation example
Outdoor model: P250
1: P63 (7.1 kW)
2: P63 (7.1 kW)
3: P63 (7.1 kW)
4: P63 (7.1 kW)
5: P40 (4.5 kW)
The total length of each pipe size is as follows:
ø9.52: A + B + C + D + a + b + c + d = 75 m
ø6.35: e = 15 m
The total capacity of connected indoor units is as follows:
7.1 + 7.1 + 7.1 + 7.1 + 4.5 = 32.9 (kW)
Therefore,
the additional charge is as follows:
19.0
15 ×
+ 75 ×
1000
117
A
A
L
r
B
C
D
a
b
c
d
B
C
C
C
C
(mm)
Liquid pipe
Gas pipe
ø9.52*
ø22.2
ø22.2
ø12.7
ø12.7
ø25.4
L [ 90 m
ø9.52*
P250
L > 90 m
ø12.7
P300
All
ø12.7
L [ 90 m
ø9.52*
P250
ø12.7
L > 90 m
P300
All
ø12.7
L [ 90 m
ø9.52*
P250
L > 90 m
ø12.7
P300
All
ø12.7
P300
All
ø12.7
Pipe size
Pipe size
Liquid pipe
Liquid pipe
+
+
ø9.52
ø12.7
(m) × 50.0 (g/m)
(m) × 92.0 (g/m)
A + B + C + D: ø9.52 30 m
a: ø9.52 15 m
b: ø9.52 10 m
c: ø9.52 10 m
d: ø9.52 10 m
e: ø6.35 15 m
50.0
+ 4.0
= 8.1 kg (round up)
1000
e
A
Outdoor Unit
B
First Branch
C
C
Indoor unit
(2) Refrigerant Piping Diameter In Section
From Branch to Indoor Unit
(Indoor Unit Piping Diameter)
a, b, c, d, e
Liquid pipe
Model number
10 - 50
ø6.35
63 - 140
ø9.52
ø9.52
200
250
ø9.52
(mm)
ø15.88
ø19.05
ø22.2
ø25.4
Total capacity of
Amount for the
connected indoor units
+
- 16.0 kW
16.1 - 27.0 kW
27.1 - 31.0 kW
31.1 - 34.0 kW
34.1 - 36.5 kW
36.6 - 39.0 kW
39.1 - 41.0 kW
41.1 kW -
At the conditions
below:
(mm)
Gas pipe
ø12.7
ø15.88
ø19.05
ø22.2
indoor units
2.5 kg
3.0 kg
3.5 kg
4.0 kg
4.5 kg
5.0 kg
5.5 kg
6.1 kg
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