To Determine Additional Refrigerant Amount - Daikin CO2 Conveni-pack LRYEN10A7Y1 Installer And User Reference Manual

18 | Charging refrigerant

18.4 To determine additional refrigerant amount

Installer and user reference guide
104
NOTICE
In case of maintenance and the system (outdoor unit+field piping+indoor units) does
not contain any refrigerant any more (e.g., after refrigerant reclaim operation), the
unit has to be charged with its original amount of refrigerant (refer to the nameplate
on the unit) and the determined additional refrigerant amount.
NOTICE
Do NOT fully close the stop valve for field piping after the refrigerant has been
charged into the unit.
NOTICE
Do NOT fully close the liquid stop valve while the unit is stopping. The field liquid
piping might burst because of liquid seal. Furthermore, continuously keep a
connection between the safety valve and the field liquid piping to avoid bursting of
the piping (if pressure increases too much).
Use method 1 for an outdoor unit WITHOUT a capacity up unit.
1 Calculate each amount of refrigerant for the liquid piping using the
Calculation table in this chapter, based on the piping size and length: (a) (b)
and (c). You may round off to the nearest 0.1 kg.
2 Total the amounts of refrigerant for the liquid piping: (a)+(b)+(c)=[1]
3 Calculate the amount of refrigerant for the indoor units using the Conversion
ratio for indoor units: refrigeration table in this chapter, based on the type of
indoor units and the cooling capacity:
▪ Calculate the amount of refrigerant for blower coils: (d)
▪ Calculate the amount of refrigerant for showcases: (e)
4 Calculate the amount of refrigerant for air conditioner indoor units using the
Conversion ratio for indoor units: air conditioners table in this chapter,
based on the model of indoor units and the number of units connected: (f).
5 Total the amounts of refrigerant for indoor units: (d)+(e)+(f)=[2]
6 Total the calculated amounts of refrigerant and add the required amount of
refrigerant for outdoor unit: [1]+[2]+[3]=[4]
7 Charge the total amount of refrigerant [4].
8 If a test runs indicates that additional refrigerant is needed, charge the
additional refrigerant and note down its amount: [6].
9 Total the calculated amount of refrigerant [4], the additional amount of
refrigerant during test run [6], and the factory charged amount of refrigerant
[5] (see label on the unit). The total amount of refrigerant in the system is
thus: [4]+[5]+[6]=[7]
10 Note down the calculation results in the calculation table.
INFORMATION
After charging, add the total amount of refrigerant to the name plate on the front
panel of the unit.
LRYEN10A7Y1+LRNUN5A7Y1
CO₂ Conveni-Pack outdoor unit
4P605460-1 – 2020.08