To Charge Refrigerant - Daikin VRV 5-S RXYSA4A7V1B Installation And Operation Manual

INFORMATION
Note down the amount of additional refrigerant that is
calculated here, for later use on the additional refrigerant
charge label. See "15.5 To fix the fluorinated greenhouse
label" [ 4 30].
gases
Formula:
R=[(X ×Ø9.5)×0.053+(X ×Ø6.4)×0.020]
1 2
R Additional refrigerant to be charged [in kg and rounded off
to 1 decimal place]
X Total length [m] of liquid piping size at Øa
1...2
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
15.3

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
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600329-1E – 2023.02
Metric piping
Piping Weight factor
Ø6 mm 0.016
Ø10 mm 0.058
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.
15 Charging refrigerant
If
Too much refrigerant is
charged
The determined additional
refrigerant amount is not
reached yet
Charging refrigerant (in manual additional refrigerant charge
mode)
The remaining additional refrigerant charge can be charged by
operating the outdoor unit by means of the manual additional
refrigerant charge mode.
5 Connect as shown. Make sure valve A is closed.
p < p >
A
d
b
R32
a c
a Weighing scales
b Refrigerant R32 tank (siphon system)
c Vacuum pump
d Refrigerant charge port (heat exchanger)
e Refrigerant charge port (suction)
A Valve A
NOTICE
The refrigerant charging port is connected to the piping
inside the unit. The unit's internal piping is already factory
charged with refrigerant, so be careful when connecting
the charge hose.
6 Open all outdoor unit stop valves. At this point, valve A must
remain closed!
7 Take all the precautions mentioned in "18 Configuration" [ 4 35]
and "19 Commissioning" [ 4 37] into account.
8 Turn on the power of the indoor units and outdoor unit.
9 Activate setting [2‑20] to start the manual additional refrigerant
charge mode. For details, see
settings" [ 4 37].
Result: The unit will start operation.
INFORMATION
The manual refrigerant charge operation will automatically
stop within 30 minutes. If charging is not completed after
30 minutes, perform the additional refrigerant charging
operation again.
Then
Recover refrigerant.
Disconnect the manifold from
the liquid line.
You do not have to perform the
"Charging refrigerant (in
manual additional refrigerant
charge mode)" instructions.
Disconnect the manifold from
the liquid line.
Continue with the "Charging
refrigerant (in manual
additional refrigerant charge
mode)" instructions.
d
e
e
"18.1.8 Mode 2: field
Installation and operation manual
29