Gree GMVVQ224WM/C-X Owner's Manual page 42

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
refrigerant added to this module is 0kg.
So, ∑Refrigerant charging amount B of every module= 0kg.
Suppose the Pipeline charging amount A=∑Liquid pipe length × refrigerant charging amount of
every 1m liquid pipe = 5kg.
Total refrigerant charging amount R = 5+0=5kg.
Modular combination of outdoor unit subjects to combinations that is currently available.
3.7.2 Refrigerant-charging Method
Refrigerant charging for multi VRF unit includes two parts: pre-charging and start-up charging，
For heat recovery units, prepare two vacuum pumps and two sets of pressure gauges before
evacuation. .
(1) Pre-charging of refrigerant.
Step 1: Connect the high pressure gauge pipe of pressure gauge 1 to the detection opening of
the high pressure gas valve, the low pressure gauge pipe to the detection opening of the low pressure
gas valve, and the medium gauge pipe to vacuum pump 1; then connect the high pressure gauge pipe
of pressure gauge 2 to the detection opening of the liquid valve, close the low pressure gauge pipe,
and connect the medium gauge pipe to vacuum pump 2.
Put through the power for the vacuum pump to conduct the vacuum drying work.
GMV Heat Recovery DC Inverter VRF
38