17
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Charging refrigerant
Installer and user reference guide
119
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
17.4 To determine the refrigerant amount
INFORMATION
The capacity up unit is a pre-charged, closed circuit. There is no need to add
additional refrigerant charging.
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)
(c)
and
(d)
. You may round off to the nearest 0.1 kg.
2
Total the amounts of refrigerant for the liquid piping:
(a)+(b)+(c)+(d)=[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:
(e)
▪
Calculate the amount of refrigerant for showcases:
(f)
4
Total the amounts of refrigerant for indoor units:
(e)+(f)=[2]
5
Total the calculated amounts of refrigerant and add the required amount of
refrigerant for outdoor unit:
[1]+[2]+[3]=[4]
6
Charge the total amount of refrigerant
[4]
.
7
If a test runs indicates that additional refrigerant is needed, charge the
additional refrigerant and note down its amount:
[5]
.
8
Total the calculated amount of refrigerant
[4]
and the additional amount of
refrigerant during test run
[6]
. The total amount of refrigerant in the system is
thus:
[4]+[5]=[6]
9
Note down the calculation results in the calculation table.
INFORMATION
After charging, add the total amount of refrigerant to the refrigerant charge label.
See
"17.6 To fix the refrigerant charge label"
Calculation table: outdoor unit with or without capacity up unit
Amount of refrigerant for liquid piping
Liquid piping size
(mm)
Conversion ratio per
meter of liquid piping
(kg/m)
Total amount of
refrigerant (kg)
Ø6.4
0.017
(a)
Ø9.5
0.0463
(b)
Ø12.7
0.0815
(c)
Ø15.9
0.1266
(d)
Subtotal (a)+(b)+(c)+(d):
[1]
Amount of refrigerant for indoor units