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PIPING WORK AND REFRIGERANT CHARGE
Additional refrigerant charge calculation for liquid piping (W1 kg)
Pipe diameter (mm)
28.58
25.40
22.20
19.05
15.88
12.70
9.52
6.35
N O T E
Series
Unit Capacity (HP)
8,10
Min. Additional Ref.
Charge of Base Unit
2.0
(kg)
Series
Unit Capacity (HP)
5-10
Minimum Additional
Ref. Charge of Base
2.0
Unit (kg)
For combination of the units, adopt the total minimum quantity of each base unit as the minimum additional refrigerant quantity.
Additional refrigerant charge quantity for indoor unit (only for heat pump system) (W2 kg)
The additional refrigerant charge is required depending on the number of connected indoor units. Select the refrigerant quantity from
the following table.
Additional refrigerant charge quantity (kg)
Indoor Unit Capacity (HP)
Additional Refrigerant Charge (kg)
C A U T I O N
number of indoor units x (0.3kg/unit or 0.5kg/unit)
=
42
PMML0479 rev.2 - 02/2018
Total piping length (m)
m
m
m
m
m
m
m
m
Total additional charge for liquid piping =
12-18 20-24 26-36 38-42 44-48 50-54 56- 60 62-66 68-72 74- 78 80-84 86-90 92-96
3.0
4.0
6.0
7.0
12,14
16-20
22
24,26 28-32 34,36 38-42 44,46 48,50 52,54 56,58
3.0
4.0
5.0
6.0
0.4 - 1.0
0.3
Refrigerant amount for 1m pipe
(kg/m)
x 0.67 =
x 0.52 =
× 0.36 =
× 0.26 =
× 0.17 =
× 0.11 =
× 0.056 =
× 0.024 =
FSXNSE
8.0
9.0
10.0
11.0
FSXNPE
7.0
8.0
9.0
10.0
11.0
1.5 - 6.0
0.5
Additional charge (kg)
12.0
13.0
14.0
15.0
60
62
12.0
13.0
14.0
15.0
16.0
64-72
16.0
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