Charging Refrigerant - Midea V8 Series Manual

7 Charging Refrigerant

7.1 Calculating Additional Refrigerant Charge
Calculate the additional charge amount of total refrigerant R(kg) according to the following formula:
R (kg) = R1 – 0.1 × N
R1 is the additional refrigerant charge quantity for liquid piping
N is the number of Arc Duct indoor units whose height is 199mm.
7.1.1 Calculating the additional refrigerant charge calculation for liquid piping (R1 kg)
The additional refrigerant charge calculation for liquid piping depends on the lengths and diameters of the outdoor and
indoor liquid pipes. Table 3-7.1 shows the additional refrigerant charge required per meter of equivalent pipe length for
different diameters of pipe. The total additional refrigerant charge is obtained by summing the additional charge
requirements for each of the outdoor and indoor liquid pipes, as in the following formula, where L
equivalent lengths of the pipes of different diameters. Assume 0.5m for the equivalent pipe length of each branch joint.
Additional refrigerant charge R1 (kg)
7.1.2 Maximum refrigerant quantity limit of the system
The refrigerant quantity of system R
R0 is factory refrigerant charge quantity
R is additional charge quantity amount of total refrigerant
Table 3-7.2: Factory refrigerant charge quantity R0 (unit: kg)
Model 80 100
R0(kg) 3.1
The maximum refrigerant quantity (R
= L (Φ6.35) × 0.022
1
+ L (Φ9.52) × 0.057
2
+ L (Φ12.7) × 0.110
3
+ L (Φ15.9) × 0.170
4
(kg) = R0 + R
s
120 140 160
3.1 4.1 4.1 4.1
) limit of the system is 14kg
s
V8 Mini R410A VRF 50Hz
Table 3-7.1: Additional refrigerant charge
Additional refrigerant charge per
Liquid side
meter of equivalent length of
piping (mm)
Φ6.35
Φ9.52
Φ12.7
Φ15.9
to L represent the
1 8
piping (kg)
0.022
0.057
0.110
0.170
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