8 | Charging refrigerant
Installer reference guide
46
4MWXM-A
R32 Split series
4P678385-1A – 2022.02
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"[433]
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.
▪ Maximum allowable refrigerant charge amount: 2.6kg
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.
NOTICE
To avoid compressor breakdown, do NOT charge more than the specified amount of
refrigerant.
Prerequisite: Before charging refrigerant, make sure the refrigerant piping is
connected and checked (leak test and vacuum drying).
1 Connect the refrigerant cylinder to the service port.
2 Charge the additional refrigerant amount.
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