Additional Refrigerant Charging - Gree GMV-VQ280WM/C-X Owner's Manual

GMV Heat Recovery DC Inverter VRF

3.7 Additional refrigerant charging

3.7.1 Calculation Method of Adding Refrigerant
Total refrigerant charging amount R= Pipeline charging amount A + Σ charging amount B of every
module.
(1) Pipeline charging amount:
Pipeline charging amount A= Σ Liquid pipe length × refrigerant charging amount of every 1m
liquid pipe
Diameter of liquid
pipe (mm)
kg/m
(2) Σ Refrigerant charging amount B of every module
Refrigerant charging amount B of every
module (kg) ②
IDU/ODU rated capacity
collocation ratio C ①
50%≤C≤70%
70%<C≤90%
90%<C≤105%
105%<C≤135%
NOTES:
① Rated capacity configuration rate of indoor unit and outdoor unit C = sum of indoor unit rated
cooling capacity / sum of outdoor unit rated cooling capacity.
② If all indoor units are all fresh air indoor units, the added refrigerant amount for each module
B is 0kg.
③ If all fresh air indoor units are mixed with the general VRF indoor units, charge the refrigerant
according to the refrigerant-charging method of the general indoor unit.
For example1:
Outdoor unit consists of one 28kW module and one 45kW module. Five 14kW duct type units are
used as indoor units.
IDU/ODU rated capacity collocation ratio C=14.0×5/(28.0+45.0)=96%. The quantity of included
IDUs is more than 4 sets. Please refer to the above table.
Additional refrigerant quantity B for 28kW module is 2.0 kg.
Additional refrigerant quantity B for 45kw module is 4 kg.
So, ∑Refrigerant charging amount B of every module=2.0+4=6 kg.
Suppose the Pipeline charging amount A=∑Liquid pipe length×refrigerant charging amount of
every 1m liquid pipe=20kg.
Total refrigerant charging amount R=20+6=26kg.
For example 2:
Outdoor unit is a 45kW module and the indoor unit is a 45kW fresh air unit. The quantity (B) of
Φ28.6 Φ25.4 Φ22.2
0.680 0.520 0.350
Quantity of
22.4
indoor unit
<4 0
≥4 0.5
<4 0.5
≥4 1
<4 1
≥4 2
<4 2
≥4 3.5
Φ19.05 Φ15.9
0.250 0.170
Module capacity(kW)
28 33.5 40
0 0 0
1 1 1
1 1 2
1 1 2
1 1 2
2 2 4
2 2 3
4 4 5
39
Φ12.7 Φ9.52
0.110 0.054
45 50.4 56
0 0 0
1 1 1
2 2 2
2 3 3
2 3 3
4 5 5
3 4 4
5 6 6
Φ6.35
0.022
61.5
0
1.5
2
3.5
3.5
5
4
6