Samsung MCU-Y6NEE Installation Manual page 13

Simultaneous heating and cooling- Additional refrigerant
• 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(25m)
Ø9.52
(25m)
(15m)
7.1kW
7.1kW
11.2kW
• T otal amount of refrigerant in the system must be less then 100kg. If total amount of refrigerant in the system is
over 100kg, the system has to be divided into smaller system, each containing less than 100kg.
Additional refrigerant charging
■ Additional refrigerant is charged according to the length and size of liquid pipe.
Liquid pipe size (O.D. mm)
 The amount of the refrigerant that is already placed in
MCU
Classification
Standard
Ø6.35(10m)
Additional refrigerant charging of MCU kit
7.1kW
Ø9.52(15m) Additional refrigerant charging of MCU is 0.5kg for every
MCU kit
7.1kW
Additional refrigerant charging of distribution kit (kg/m)
Ø9.52(18m)
Regardless of the liquid pipe size, additional refrigerant
7.1kW
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
8HP 10HP 12HP 14HP 16HP 18HP 20HP
5.0 5.0 5.0
Ø6.35 Ø9.52 Ø12.70 Ø15.88 Ø19.05
25 101 6 20
= 13.61 + 2.792 + 1.02 = 17.422kg
Additional refrigerant charging (kg/m)
0.02
0.06
0.125
0.18
0.27
0.35
0.53
7.0 7.0 8.5
(kg/unit)
0.5
Remarks
For wall-mounted &
0.01
ceiling indoor unit
ⓐ
)
ⓑ
) =
ⓒ ) = ∑(The number
ⓐ ⓑ ⓒ
+ +
Pipe length after
MCU
distribution kit (m)
10
2 Ea
2
8.5
13