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NOTICE
▪ Ensure that contamination of different refrigerants does
not occur when using charging equipment.
▪ Charging hoses or lines shall be as short as possible to
minimise the amount of refrigerant contained in them.
▪ Cylinders shall be kept in an appropriate position
according to the instructions.
▪ Ensure that the refrigerating system is earthed prior to
charging the system with refrigerant. See
connect the electrical wiring to the outdoor
▪ Label the system when charging is complete.
▪ Extreme care shall be taken not to overfill the
refrigerating system.
NOTICE
Prior to charging the system, it shall be pressure tested
with the appropriate purging gas. The system shall be leak
tested
on
completion
commissioning. A follow up leak test shall be carried out
prior to leaving the site.
16.2
To determine the additional
refrigerant amount
WARNING
The maximum indoor capacity index which can be
connected to a SV 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
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
"16.5 To fix the fluorinated greenhouse
label" [ 4 36].
gases
NOTICE
The refrigerant charge of the system must be less than
79.8 kg. For factory charge, refer to the unit name plate.
Formula:
R = [(X
× Ø15.9) × 0.16 + (X
× Ø12.7) × 0.10 + (X
1
2
+ (X
× Ø6.4) × 0.020] + A
4
R
Additional refrigerant to be charged [kg] (rounded off to
one decimal place)
X
Total length [m] of liquid piping size at Øa
1...4
A
Parameter A (see below)
INFORMATION
When using more than one SV unit, add the sum of the
individual SV unit charge factors.
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752781-1B – 2024.02
"17.4 To
unit" [ 4 38].
of
charging
but
prior
to
units" [ 4 19] to
× Ø9.5) × 0.053
3
16 Charging refrigerant
▪ Parameter A: Individual SV unit charge factors
Model
SV1A
SV4A
SV6A
SV8A
Metric piping. When using metric piping, replace the weight factors
in the formula by the ones from the following table:
Inch piping
Piping
Weight factor
Ø6.4 mm
0.020
Ø9.5 mm
0.053
Ø12.7 mm
0.10
Ø15.9 mm
0.16
16.3
To charge refrigerant
To speed up the refrigerant charging process, it is in case of larger
systems recommended to first pre-charge a portion of refrigerant
through the liquid line before proceeding with the manual charging. It
can be skipped, but charging will take longer then.
Pre-charging refrigerant
Pre-charging can be done without compressor operation, by
connecting the refrigerant bottle to the service port of the liquid stop
valve.
1 Connect as shown. Make sure that all outdoor unit stop valves,
as well as valve A are closed.
p <
p >
A
B
a
d
N
R32
2
b
c
e
a
Pressure reducing valve
b
Nitrogen
c
Weighing scales
d
Refrigerant R32 tank (siphon system)
e
Vacuum pump
f
Liquid line stop valve
g
Gas line stop valve
A
Valve A
B
Valve B
C
Valve C
2 Open valves C and B.
3 Pre‑charge refrigerant until the determined additional refrigerant
amount is reached or pre‑charging is not possible anymore, and
then close valves C and B.
4 Do one of the following:
If
The determined additional
refrigerant amount is
reached
Parameter A
0.4 kg
0.5 kg
0.7 kg
0.9 kg
Metric piping
Piping
Weight factor
Ø6 mm
0.016
Ø10 mm
0.058
Ø12 mm
0.088
Ø15 mm
0.14
Ø16 mm
0.16
g
f
C
Then
Disconnect the manifold from the
liquid line.
You do not have to perform the
"Charging refrigerant (in manual
additional refrigerant charge
mode)" instructions.
Installation and operation manual
35
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