8 | Charging refrigerant
Installer reference guide
46
2MXM-A9, 3MXM-A9, 4MXM-A9, 5MXM-A9
R32 Split series
4P600463-7G – 2022.09
NOTICE
Applicable legislation on fluorinated greenhouse gases requires that the refrigerant
charge of the unit is indicated both in weight and CO
2
equivalent.
Formula to calculate the quantity in CO
2
equivalent tonnes: GWP value of the
refrigerant × total refrigerant charge [in kg]/1000
Contact your installer for more information.
8.3 Precautions when charging refrigerant
INFORMATION
Also read the precautions and requirements in the following chapters:
▪ "2General safety precautions"[47]
▪ "7.1Preparing refrigerant piping"[432]
8.4 To determine the additional refrigerant amount
If the total liquid piping
length is…
Then…
≤30m Do NOT add additional refrigerant.
>30m R=(total length (m) of liquid piping–30m)×0.020
R=Additional charge (kg) (rounded in units of 0.1kg)
INFORMATION
Piping length is the one-way length of liquid piping.
INFORMATION
Additional refrigerant charge is NOT allowed in case of combination of the outdoor
unit 3MXM40 or 3MXM52 with the indoor units CVXM-A and/or FVXM-A. The total
piping length MUST be ≤30m.
CVXM-A9, FVXM-A9 is without this limitation
Maximum allowable refrigerant charge amount
3MXM40, 3MXM52 2.2kg
3MXM68, 2MXM68 2.4kg
4MXM68 2.6kg
4MXM80 3.2kg
5MXM90 3.3kg
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