16 Charging refrigerant
Installation and operation manual
36
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P684060-1 – 2022.02
16.3
To determine the additional
refrigerant amount
WARNING
The maximum indoor capacity index which can be
connected to a BS unit port is determined based on the
smallest room served by that port.
In case the system serves the lowest underground floor of
a building, there is an extra limit to the maximum allowable
total refrigerant amount. This maximum refrigerant amount
is determined based on the area of the smallest room on
the lowest underground floor.
See
"13 Special requirements for R32 units"
21] to
determine the maximum allowable total refrigerant amount.
INFORMATION
For final charge adjustment in the test laboratory, please
contact your local dealer.
INFORMATION
Note down the amount of additional refrigerant that is
calculated here, for later use on the additional refrigerant
charge label. See
"16.8 To fix the fluorinated greenhouse
NOTICE
The refrigerant charge of the system must be less than
63.8 kg. This means that in case the calculated total
refrigerant charge is equal to or more than 63.8 kg you
must divide your multiple outdoor system into smaller
independent systems, each containing less than 63.8 kg
refrigerant charge. For factory charge, refer to the unit
name plate.
NOTICE
The total refrigerant charge amount in the system MUST
always be lower than 15.96 [kg]× the number of indoor
units connected downstream of BS units, with a maximum
of 63.8 kg.
Formula:
R=[(X
1
×
Ø19.1
)×0.23+(X
2
×
Ø15.9
)×0.16+(X
3
×
Ø12.7
)×0.10+(X
4
×
Ø9.5
)
×0.053+(X
5
×
Ø6.4
)×0.020]×1.04+(A+B+C)
R
Additional refrigerant to be charged [in kg and rounded
off to 1 decimal place]
X
1...5
Total length [m] of liquid piping size at
Øa
A~C
Parameters A~C (see below)
INFORMATION
▪ In case of a multi-outdoor-unit system, add the sum of
the individual outdoor unit charge factors.
▪ When using more than one multi BS unit, add the sum
of the individual BS unit charge factors.
▪
Parameter A:
If the total indoor unit capacity connection ratio
(CR)>100%, charge an additional 0.5 kg of refrigerant per outdoor
unit.
▪
Parameter B:
Outdoor unit charge factors
Model
Parameter B
REMA5
0 kg
REYA8~12
REYA14
1.2 kg
REYA16
1.3 kg
REYA18
4.3 kg
REYA20
▪
Parameter C:
Individual BS unit charge factors
Model
Parameter C
BS4A
0.7 kg
BS6A
1.0 kg
BS8A
1.2 kg
BS10A
1.5 kg
BS12A
1.7 kg
Metric piping.
When using metric piping, replace the weight factors
in the formula by the ones from the following table:
Inch piping
Metric piping
Piping
Weight factor
Piping
Weight factor
Ø6.4 mm
0.020
Ø6 mm
0.016
Ø9.5 mm
0.053
Ø10 mm
0.058
Ø12.7 mm
0.10
Ø12 mm
0.088
Ø15.9 mm
0.16
Ø15 mm
0.14
Ø16 mm
0.16
Ø19.1 mm
0.23
Ø19 mm
0.22
