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OEM Manual – CUBO
7.2.3
Estimation of the refrigerant charge
To calculate the refrigerant quantity to charge in the system you should know:
Volume of evaporator coil
Diameter and Length of the piping
Liquid Receiver volume and Gas Cooler volume
The total charge of refrigerant will be the obtained summing up the single quantity needed for the
evaporators, for fill the liquid line and considering the quantity will stay in the Gas Cooler and in the liquid
receiver (refer to the below example).
We recommend to use the Excel calculation sheet to calculate the quantity of refrigerant to charge in
the system. You can get it from SCMFrigo.
Regardless from the calculation results, the minimum recommended CO2 charged is 4kg.
For estimation greater than 4kg the quantity of charged CO2 must be the calculated one.
The max permitted CO2 charge must guaranty that, in case of pump down at EEV in front of
Evaporators, refrigerant inside the receiver will not exceed 7.2kg. This is not the total system charge, it is
the refrigerant that will be in the receiver when the system pumps down from the evaporator expansion device!
Data for calculation:
Receiver 8L min quantity of CO2 = 2,4 kg
PHE Gas Cooler quantity of CO2 = 0,21 kg
6,0
5,0
4,0
3,0
2,0
1,0
0,0
2
4
Evaporator Volume (dm3)
UMT/WG T MT Rev3.0 – 08/10/2021
AQUA
2
6
8
10
12
Using this diagram you can calculate refrigerant
charge related to the evaporator inner volume.
Using this diagram you can calculate refrigerant
charge related to the pipe diameter and length. You
can refer even to the following table.
EN
Pag. 13-EN
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