55
8.3 Calculating Refrigerant's Additional Charge
Although the unit is charged with refrigerant, the supplementary refrigerant quality is determined and
charged into the system based on the length of refrigerant piping. The actual additional charge volume
is determined according to the following requirements.
After completing the charging, report the additional charge to the local service center.
1. Calculation method of additional refrigerant filling amount is given in the below table:
Table 8.1 Additional Refrigerant Charge Calculation
Sl
No.
Symbol
Content
Additional
Charge
1
W1
Calculation method of the amount of refrigerant added to the liquid pipe (W1 kg)
Piping
diameter
Piping total
length (m)
Supplementary refrigerant charging
amount for 1m total length of piping
Additional charge
(kg)
ø6.35
m
x 0.03=
kg
ø9.52
m
x 0.06=
kg
ø12.7
m
x 0.12=
kg
ø15.88
m
x 0.19=
kg
ø19.05
m
x 0.28=
kg
ø22.2
m
x 0.36=
kg
ø25.4
m
x 0.52=
kg
ø28.58
m
x 0.67=
kg
Total additional charge of liquid pipe =
kg
kg
NOTE:
If the indoor units are all Cassette, in addition the models are
JDCK028H0PAGQ,JDCK040H0PAGQ,JDCK080H0PAGQ,JDCK090H0PAGQ,
the minimum amount of additional refrigerant W1 is shown in the table below
Outdoor Unit HP
8~10
12
14~18
20~24
26
28~34
36~42
44~48
W1: the minimum
amount of additional
refrigerant (kg)
2
3
3
4
5
6
7
8
Outdoor Unit HP
50
52~58
60~66
68~72
74
76~78
80~96
W1: the minimum
amount of additional
refrigerant (kg)
9
10
11
12
13
14
16
2
W2
Calculation method of additional refrigerant charge in indoor unit (W2 kg)
Indoor Unit model
Refrigerant additional charge(kg/unit)
18 ~ 36 type
0.3
40 ~ 160 type
0.5
224 and above
1.0
NOTE:
The maximum amount of refrigerant additional to the indoor unit W2 is 6.0kg
kg
3
W3
Indoor unit connection ratio (total indoor unit capacity / outdoor unit capacity)
Additional charge (W3 kg)
Indoor capacity ratio
Refrigerant additional charge(kg)
<100%
0
100% to 130% or less
0.5
kg
4
W
Total additional charge ( W kg) = W1+W2+W3
