8 | Charging refrigerant
Installer reference guide
48
2(A)MXM40+50 + 2(A)MXF40+50
R32 Split series
4P600463-2C – 2020.08
WARNING
NEVER directly touch any accidental leaking refrigerant. This could result in severe
wounds caused by frostbite.
8.3 Precautions when charging refrigerant
INFORMATION
Also read the precautions and requirements in the following chapters:
▪ "2General safety precautions"[45]
▪ "7.1Preparing refrigerant piping"[434]
8.4 To determine the additional refrigerant amount
If the total liquid piping
length is…
Then…
≤20m Do NOT add additional refrigerant.
>20m R=(total length (m) of liquid piping–20m)×0.020
R=Additional charge (kg) (rounded in units of 0.1kg)
INFORMATION
Piping length is the one-way length of liquid piping.
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.
8.6 To charge additional refrigerant
WARNING
▪ Only use R32 as refrigerant. Other substances may cause explosions and
accidents.
▪ R32 contains fluorinated greenhouse gases. Its global warming potential (GWP)
value is 675. Do NOT vent these gases into the atmosphere.
▪ When charging refrigerant, ALWAYS use protective gloves and safety glasses.
CAUTION
To avoid compressor breakdown, do NOT charge more than the specified amount of
refrigerant.
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