Daikin GCU2020PXB1 Installation, Commissioning And Maintenance Manual page 23

The maximum amount of refrigerant can be charged into the system is 9.27 kg (at 80% receiver
capacity).
16 Estim ation of refrigerant and oil charge
The refrigerant charge shown below based on estimation that the receiver is fiilled up to 1
pipework lengths and one evaporator connected.
Initially, an estimation of refrigerant charge hold by the evaporator is showing below. The graph below it can be
used as tool to estimate the refrigerant amount in the evaporator and it is related to the evaporator inner volume.
In additional the following formula can be used to calculate the refrigerant charge for various evaporator internal
volumes.
Refrigerant charge (kg) = (0.411 * Evaporator Internal Volume
If the evaporator volume is not known, the following estimation can be used:
For GCU2020PXB1 unit: 1.5 kg refrigerant at evaporator (estimation based on full capacity load of the condensing
unit.
** Hubbard Products Ltd recommends connection with 2 remote evaporators. In case more than two
evapoartors plan to be connected with the unit please contact Hubbard technical.
The following table is presententing the amount of refrigerant and oil 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:
Copyright HPL March 2021
Oil / Refrigerant ≥ 35 (wt %)
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st sight glass, different
) + 0.2119
(dm 3 or L)
P41135 Rev 03