8
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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:
▪
"2 General safety precautions"
▪
"7.1 Preparing refrigerant piping"
8.4 To determine the additional refrigerant amount
If the total liquid piping
length is…
Then…
≤30 m
Do NOT add additional refrigerant.
>30 m
R=(total length (m) of liquid piping–30 m)×0.020
R=Additional charge (kg) (rounded in units of 0.1 kg)
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 ≤30 m.
Maximum allowable refrigerant charge amount
3MXM40, 3MXM52
2.2 kg
3MXM68, 2MXM68
2.4 kg
4MXM68
2.6 kg
4MXM80
3.2 kg
5MXM90
3.3 kg
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.