Daikin Multi+ R32 Split Series - Precautions When Charging Refrigerant; To Determine the Additional Refrigerant Amount; To Determine the Complete Recharge Amount; To Charge Additional Refrigerant

8 | Charging refrigerant
Installer reference guide
45
4MWXM-A9
R32 Split series
4P708645-1 – 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:
▪ "2General safety precautions"[47]
▪ "7.1Preparing refrigerant piping"[432]
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.
▪ Maximum allowable refrigerant charge amount: 2.6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.
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.