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If the evaporator volume is not known, the following estimation can be used:
For HCU2040PXB1 unit: 2.2 kg refrigerant at evaporator (estimation based on full capacity load of the condensing
unit.
The following table is presententing the amount of refrigerant charge estimated for:
• Different pipe lengths
• Receiver up to 1
st
sight glass full
• Evaporator to match the capacity of unit
Recommended values – Those may change from installation to installation.
The amount of oil in the system is a proportional of refrigerant charge:
Example of oil charge:
- If the system is charged with 10 kg of CO2, then the recommended amount of oil is 3.5 kg.
Pipe length (to
evaporator m)
Refrigerant amount in all
pipework (kg)
Refrigearnt amount in
evaporator (kg)
Refrigerant left in
receiver (kg)
Total (kg)
Oil charge (kg)
Initial charge (kg)
Oil charge (kg)
The correct amount of oil into the system ensures the compressor reliability and increase the lifetime
The HCU2040PXB1 unit is delivered with 1.15 kg of oil. The additional oil required for varies pipe length
is shown in table above. The additional oil can be added in the system from the valve showing below.
Copyright HPL March 2021
Oil / Refrigerant ≥ 35 (wt %)
5
8
11
14
0.6
0.81
1.01
1.21
6.28
6.49
6.69
6.89
2.20
2.27
2.34
2.41
1.15
1.15
1.15
1.15
1.05
1.12
1.19
1.26
of the system.
17
20
23
26
1.41
1.61
1.81
2.01
2.20
3.48
7.09
7.29
7.49
7.69
2.48
2.55
2.62
2.69
1.15
1.15
1.15
1.15
1.33
1.40
1.47
1.54
Page 24 of 169
29
32
35
2.21
2.41
2.61
7.89
8.09
8.29
2.76
2.83
2.90
1.15
1.15
1.15
1.61
1.68
1.75
P4367 Rev 01
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