Samsung RD080HRXGB Installation Manual page 19

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Example) Additional refrigerant charging
61.6kW
Ø12.70(1m)
Ø12.70(5m)
Ø19.05(10m)
Ø15.88(10m) Ø15.88(10m)
MCU
Ø6.35(15m)
Ø9.52
(10m)
2.8kW
Ø6.35(2m)
11.2kW
Ø9.52 Ø9.52 7.1kW
(15m) (25m)
7.1kW
Ø9.52(18m)
11.2kW
Additional refrigerant charging
 Additional refrigerant is charged according to the length and size of
liquid pipe.
Liquid pipe size (O.D. mm) Additional refrigerant charging (kg/m)
 The amount of the refrigerant that is already placed in
MCU
Classification 8HP 10HP 12HP 14HP 16HP 18HP 20HP
Ø6.35(10m) Standard
Additional refrigerant charging of MCU kit
7.1kW
Additional refrigerant charging of MCU is 0.5kg for
Ø9.52(15m)
every MCU kit
7.1kW
Additional refrigerant charging of
Ø9.52(18m)
Regardless of the liquid pipe size, additional
7.1kW
refrigerant charging is 0.01kg per meter after
distribution kit
 Charge the additional refrigerant according to the indoor unit
capacity. The amount of the additional refrigerant charging for each
indoor unit capacity = 0.046kg/kW
 The method to calculate the total amount of the refrigerant.
- The amount of the refrigerant according to the pipe size and length (
- The amount of additional refrigerant charging for each indoor unit (
∑ (Indoor unit capacity) x 0.046
- The amount of other additional refrigerant charging (
of MCU Kit installed) x 0.5
- The total amount of the additional refrigerant charging =
 Example of additional refrigerant charging.
Pipe length is as below.
Liquid pipe
size
(O.D. mm)
Length (m)
ⓐ = 25x0.02 +101x0.06 + 6x0.125 + 20x0.18 + 10x0.27 = 13.61kg
❈
ⓑ
= (11.2x2 + 7.1x5 + 2.8x1)x0.046 = 2.7922kg
ⓒ
= 2x0.01 + 2x0.5 = 1.02
The total amount of the additional refrigerant charging :
ⓐ ⓑ
+ +
❈ Total refrigerant amount of the system must be less than 100kg.
If total refrigerant amount of system is over 100kg, the system has to be
divided into smaller system, each containing less than 100kg.
ex) 20HP outdoor refrigerant is already charged 8.5kg, so the additional
refrigerant must not be over 91.5kg.
Ø6.35
Ø9.52
Ø12.70
Ø15.88
Ø19.05
Ø22.23
Ø25.40
5.0 5.0 5.0
distribution kit (kg/m)
Ø6.35 Ø9.52 Ø12.70 Ø15.88 Ø19.05
25 101 6 20
ⓒ
= 13.61 + 2.792 + 1.02 = 17.422kg
0.02
0.06
0.125
0.18
0.27
0.35
0.53
7.0 7.0 8.5 8.5
(kg/unit)
0.5
Remarks
For wall-mounted &
0.01
ceiling indoor unit
ⓐ
)
ⓑ ) =
ⓒ ) = ∑(The number
ⓐ + ⓑ + ⓒ
Pipe length after
MCU distribution kit
(m)
2 Ea 2
10
installing the unit _19