DC Inverter Multi VRF System
16
(2) Calculation of the amount of additional refrigerant.
Adding refrigerant method includes 2 steps as follow:
1) Amount of additional refrigerant depending on the pipe size(X).
2) Amount of additional refrigerant depending on Quantity of IDU(Y).
Total charging amount =X+Y
Detail calculation is as follow:
1) X
= ∑(Liquid pipe length×
amount of additional refrigerant of each 1m)
Diameter of liquid pipe
(mm/inch)
Φ19.05
(
Φ3/4
)
Φ15.9
(
Φ
5/8)
Φ12.7
(
Φ
1/2)
Φ9.52
(
Φ3/
8)
Φ6.35
(
Φ
1/4)
kg/m
0.25
0.17
0.11
0.054
0.022
oz/inch
0.224
0.152
0.099
0.048
0.020
2) Y=(Quantity of IDU
－
2)
×
0.3 kg(10.58oz)
First confirm that there is no leakage from the system. When compressor is not working, charge
additional R410A with specific amount to the unit through the filling opening of the liquid pipe valve of
the outdoor unit. If required amount cannot be quickly filled due to pressure increase of the pipe, then
set the unit in cooling startup and fill refrigerant from the low pressure check valve of the outdoor unit.
Example
：
IDU:
No.
IDU
①
IDU
②
IDU
③
IDU
④
Model
Duct type
GMV-N18G/A3A-D(U)
Duct type
GMV-N12G/A3A- D(U)
Duct type
GMV-ND09PLS/A-T(U)
Duct type
GMV-ND09PLS/A-T(U)
Liquid pipe:
No.
A
B
C
D
Pipe size
Φ9.52
mm
(Φ3/
8inch)
Φ9.52
mm
(Φ3/
8inch)
Φ9.52
mm
(Φ3/
8inch)
Φ
6.35
(
Φ
1/4inch)
Length
10m
(32-3/4feet)
5m
(16-3/8feet)
4m
(13-1/8feet)
5m
(16-3/8feet)
Summary of Contents for GMV-36WL/C-T
Page 23: ...DC Inverter Multi VRF System 20 Fig 4 26 Fig 4 27...
Page 36: ......
