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5.6.1. If additional refrigerant is required
• When the piping is longer than chargeless piping length, additional charging is neces-
sary.
1) Remove the charging port cap from the liquid pipe.
2) Attach a charging hose to the refrigerant cylinder, and connect it to the charging
port.
3) Add refrigerant by calculating the additional refrigerant volume in accordance with
the table below.
4) Remove the charging hose and install the charging port cap.
5) Remove the body caps (gas pipe, and liquid pipe), and open the valves.
6) Close the body caps.
* Tighten the body caps and charging port caps to the torque values specifi ed in the
Table A of "5.3.5. Handling precautions for the valves".
To open and close the valves,
Use an M5 hexagon wrench for liquid pipes.
Use an M10 hexagon wrench for gas pipes.
Piping length Chargeless [m]
30
Additional charging amount
Single type
*1
L
> Chargeless piping length
Refrigerant pipe
size
[mm (in.)]
Standard
~30 m 40 m
Liquid
12.70 (1/2)
None 1,100 g 2,200 g 3,300 g 4,400 g 5,500 g 6,600 g 7,700 g 110 g/m
Gas
25.40 (1)
Size down
~30 m 40 m
Liquid
12.70 (1/2)
None 1,100 g 2,200 g 3,300 g 4,400 g 5,500 g 6,600 g 7,700 g 110 g/m
Gas
22.22 (7/8)
*1 : Refer to "View" in the table of "4.3.1. Single type installation".
Simultaneous operation multi type
(*2)
Twin : L1+L2+L3
> Pre-charge length
(*2)
Triple : L1+L2+L3+L4
> Pre-charge length
Double-twin: L1+L2+L3+L4+L5+L6+L7
*2 : Refer to "View" in the table of "4.3.2. Simultaneous operation multi type installation."
The additional charging amount for twin / triple / double-twin type will be calculated as fol-
lows:
Additional charging amount (g)
= (A x 110) + (B x 50) + (C x 30) - 3,300
• A = Piping length (m) of liquid pipe [12.70 mm (1/2 in.)]
• B = Piping length (m) of liquid pipe [9.52 mm (3/8 in.)]
• C = Piping length (m) of liquid pipe [6.35 mm (1/4 in.)]
Do not remove refrigerant, even if the additional amount calculated is negative.
(Example 1)
Indoor unit
(45,000 Btu)
L2 : 10 m
Liquid pipe [mm]
Gas pipe [mm]
Indoor unit
(45,000 Btu)
L3 : 7 m
Liquid pipe [mm]
Gas pipe [mm]
Additional charging amount
Liquid pipe diameter
[mm]
12.70
9.52
6.35
Applying the formula,
(30 x 110) + (17 x 50) + (0 x 30) - 3300 = 850
The additional charging amount is 850 g.
En-9
Piping length
50 m
60 m
70 m
80 m
90 m 100 m
50 m
60 m
70 m
80 m
90 m 100 m
(*2)
> Pre-charge length
Outdoor unit
9.52
L1 : 30 m
(90,000 Btu)
15.88
Liquid pipe [mm]
Gas pipe [mm]
9.52
15.88
Piping length
Coeffi cient
[m]
30
A = 30
17
B = 17
0
C = 0
(Example 2)
Indoor unit
(30,000 Btu)
Indoor unit
(30,000 Btu)
Indoor unit
(30,000 Btu)
Additional charging amount
Applying to the formula,
(10 x 110) + (15 x 50) + (0 x 30) - 3300 = -1450
g/m
The calculated value is negative. Do not add or remove any refrigerant.
g/m
(Example 3)
Indoor unit
(18,000 Btu)
Liquid pipe [mm]
Gas pipe [mm]
Indoor unit
(18,000 Btu)
Liquid pipe [mm]
Gas pipe [mm]
Indoor unit
(18,000 Btu)
Liquid pipe [mm]
Gas pipe [mm]
Indoor unit
(18,000 Btu)
Liquid pipe [mm]
Gas pipe [mm]
Additional charging amount
12.70
Liquid pipe diameter
25.40
Applying to the formula,
(20 x 110) + (20 x 50) + (20 x 30) - 3300 = 500
The additional charging amount is 500 g.
L2 : 5 m
Liquid pipe [mm]
9.52
Gas pipe [mm]
15.88
L3 : 5 m
Liquid pipe [mm]
9.52
Gas pipe [mm]
15.88
L4 : 5 m
Liquid pipe [mm]
9.52
Gas pipe [mm]
15.88
Liquid pipe diameter
Piping length
[mm]
12.70
9.52
6.35
L4 : 5 m
6.35
12.70
L2 : 10 m
Liquid pipe [mm]
9.52
Gas pipe [mm]
15.88
L5 : 5 m
6.35
12.70
L6 : 5 m
6.35
12.70
L3 : 10 m
Liquid pipe [mm]
9.52
Gas pipe [mm]
15.88
L7 : 5 m
6.35
12.70
Piping length
[mm]
[m]
12.70
20
9.52
20
6.35
20
Outdoor unit
(90,000 Btu)
L1 : 10 m
Liquid pipe [mm]
12.70
Gas pipe [mm]
25.40
Coeffi cient
[m]
10
A = 10
15
B = 15
0
C = 0
Outdoor unit
(72,000 Btu)
L1 : 20 m
Liquid pipe [mm] 12.70
Gas pipe [mm]
25.40
Coeffi cient
A = 20
B = 20
C = 20
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