8 | Charging refrigerant
Installer reference guide
48
2MXM-A, 3MXM-A, 4MXM-A, 5MXM-A
R32 Split series
4P600463-5E – 2021.12
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.
Maximum allowable refrigerant charge amount
3MXM40, 3MXM52 2.2kg
3MXM68, 2MXM68 2.4kg
4MXM68 2.6kg
4MXM80 3.2kg
5MXM90 3.3kg
8.5 To determine the complete recharge amount
INFORMATION
If a complete recharge is necessary, the total refrigerant charge is: the factory
refrigerant charge (see unit name plate) + the determined additional amount.
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