Additional Refrigerant Charge Calculation - Hitachi RAS-4FSNME1 Instruction Manual

REFRIGERANT CHARGE

9.2 ADDITIONAL REFRIGERANT CHARGE CALCULATION

Although refrigerant has been charged into this unit in advance
(W (kg)), additional refrigerant charge (W (kg)) is required
0
according to piping length.
Ensure that the total additional refrigerant charge quantity
should not exceed the max. additional charge quantity shown in
the table below.
Refrigerant charge
Model
before shipment (W
RAS-4FS(V)NME1
RAS-5FS(V)NME1
RAS-6FS(V)NME1
RAS-8FSXNME1
RAS-10FSXNME1
RAS-12FSXNME1
Determine the additional refrigerant quantity according to the
following procedure, and charge the system with it. Record
the additional refrigerant quantity to facilitate maintenance and
servicing activities thereafter.
9.2.1 For RAS-(4-6)FS(V)NME1

W - Additional refrigerant charge for outdoor
E
unit model (kg)
Outdoor unit Additional refrigerant charge for outdoor unit model
RAS-4FS(V)NME1
RAS-5FS(V)NME1
RAS-6FS(V)NME1

W - For liquid piping (kg)
1
Pipe diameter Total piping
(mm) length (m)
Ø12.70 ___ m
Ø9.52 ___ m
Ø6.35 ___ m
Total additional charge for liquid piping

W - Additional refrigerant charge (kg)
Calculation of additional charge (kg): W = W

Total refrigerant charge in the system (kg)
Calculation of total refrigerant charge in the system W
9.2.2 For RAS-(8-12)FSXNME1
 W - Additional refrigerant charge for outdoor
E
unit model (kg)
Outdoor unit
RAS-8FSXNME1
RAS-10FSXNME1
RAS-12FSXNME1
22 PMML0532 rev.1 - 12/2020
Maximum additional
(kg)) charge (kg)
0
1.1 11.9
1.4 11.6
1.4 11.9
2.0 28.3
2.5 29.1
2.5 29.1
2.6
2.7
2.7
Refrigerant amount Additional
for 1m pipe (kg/m) charge (W)
x 0.085 =_____kg
x 0.050 =_____kg
x 0.020 =_____kg
=_____kg
+ W
E 1
= W + W
T
Additional refrigerant charge for outdoor
unit model
2.2
3.0
3.0

W . For liquid piping (kg)
1
Pipe diameter Total piping
(mm) length (m)
Ø15.88 ___ m
Ø12.70 ___ m
Ø9.52 ___ m
Ø6.35 ___ m
Total additional charge for liquid piping
?
N O T E
In the case that the quantity calculated above is less than the minimum
quantity indicated in the table below, adopt the quantity in the table below
as the additional refrigerant quantity for piping liquid, regardless of the
piping length.
Model
Minimum additional refrigerant charge
of OU (kg)

W - For indoor unit (kg)
2
Depending on the number of connected indoor units, select the
refrigerant quantity from the following table:
Indoor Unit Capacity (HP)
Refrigerant additional quantity (kg)
Maximum additional refrigerant charge must not exceed 6.0kg.
Nº of IU x 0.3 kg/unit or 0.5 kg/unit = additional charge (W2 kg) ≤ 6.0 kg

W - For indoor unit 8HP and 10HP only (g)
3
Additional refrigerant charge is 1kg/unit of 8HP and 10HP indoor
units.
N of 8HP and 10HP IU x 1.0 kg/unit.= Additional charge (W3 kg)

W - For indoor unit (W4 kg)
4
Depending on the ratio of the indoor unit connection capacity.
IU Capacity Ratio is ≤ 100% = 0.0kg
IU Capacity Ratio is > 100% = 0.5kg.

W - For each CH-Box connected (W5 kg)
5
If CH-Boxes (multiple branch type only) are connected,
additional refrigerant charge is required. Select adequate
refrigerant charge from the following table.
0
CH-Box CH-
Model AP04MSSX
Additional
Refrigerant 0.1
Charge (kg)

W - Calculation of additional refrigerant charge (kg)
W = W + W (min. 2kg) + W
E 1
W = W + W (min. 2kg) + W
E 1

Total refrigerant charge in the system
Total refrigerant charge in the system W
Refrigerant amount for Additional
1m pipe (kg/m) charge
x 0.17 =_____kg
x 0.11 =_____kg
x 0.056 =_____kg
x 0.024 =_____kg
=_____kg
RAS-(8-12)FSXNME1
2.0
0.4 - 1.0 1.5 - 6.0
0.3
CH- CH-
AP08MSSX AP12MSSX AP16MSSX
0.2 0.3
+ W +W (Only heat pump)
2 3 4
+ W +W + W (Only heat recovery)
2 3 4 5
= W + W
T 0
0.5
CH-
0.4