Gree GMV-72WM/B-U Owner's Manual page 30

GMV DC Inverter VRF
(2) ∑Refrigerant charging amount B of every module.
Refrigerant charging amount B of every module
kg(Pounds)
IDU/ODU rated capacity
collocation ratio C
50%≤C≤90%
90%<C≤105%
105%<C≤135%
(1) IDU/ODU rated capacity collocation ratio C = Sum of rated cooling capacity of indoor unit / Sum of rated cooling
capacity of outdoor unit.
(2) If all of the indoor units are fresh air indoor units, the quantity of refrigerant added to each module is 0kg.
(3) If outdoor air processor is connected with normal VRF indoor unit, adopt the perfusion method for normal indoor
unit for perfusion.
For example1:
The ODU is composed of 3 modules: 72kBtu/h, 120 kBtu/h and 120 kBtu/h. The IDUs are made
up of 7sets of 48 kBtu/h.
IDU/ODU rated capacity collocation ratio C= 48×7/(72+120+120)=108%.The quantity of included
IDUs is more than 4 sets. Please refer to the above table.
Refrigerant charging amount B for 72kBtu/h module is 4.0kg(8.8pounds).
Refrigerant charging amount B for 120 kBtu/h module is 4.0kg(8.8pounds).
Refrigerant charging amount B for 120 kBtu/h module is 4.0kg(8.8pounds).
So, Σ Refrigerant charging amount B of every module=4.0+4.0+4.0=12kg (8.8+8.8+8.8
=26.4pounds).
Suppose the Pipeline charging amount A=Σ Liquid pipe length × refrigerant charging amount of
every 1m (or 1inch) liquid pipe=25kg (55.1 pounds)
Total refrigerant charging amount R=25+12=37kg (55.1+26.4=81.5pounds).
For example 2:
Outdoor unit is a 72kBtu/h module and the indoor unit is a 72kBtu/h fresh air unit. The quantity (B)
of refrigerant added to this module is 0kg (0pounds).
So, ΣB (Quantity of refrigerant added to each module) = 0kg (0pounds).
Suppose that A (Quantity of refrigerant added to connection pipe) = ∑ Length of liquid pipe x
Quantity of refrigerant added to liquid pipe per meter) = 5kg (11pounds).
R (Quantity of added refrigerant in total) = 5+0=5kg (11+0=11pounds).
Modular combination of outdoor unit subjects to combinations that is currently available.
After confirming that there is no leakage from the system, when the compressor is not in
operation, charge additional R410A with specified amount to the unit through the filling opening of the
Quantity of included
IDUs(N)
N<4
N≥4
N<4
8>N≥4
N≥8
N<4
8>N≥4
N≥8
26
Rated Capacity(kBtu/h)
72 96
0 0
0.5(1.1) 0.5(1.1)
1(2.2) 1(2.2)
2(4.4) 2(4.4)
4(8.8) 3.5(7.7)
2(4.4) 2(4.4)
4(8.8) 3.5(7.7)
4.5(9.9) 4.5(9.9)
120
0
0.5(1.1)
1.5(3.3)
3(6.6)
4(8.8)
2.5(5.5)
4(8.8)
5(11.0)