5 Installation
Installation and operation manual
15
RXYSQ8~12TMY1B
VRV IV-S system air conditioner
4P400263-1F – 2017.02
5.6 Charging refrigerant
5.6.1 Precautions when charging refrigerant
WARNING
▪ Only use R410A as refrigerant. Other substances may
cause explosions and accidents.
▪ R410A contains fluorinated greenhouse gases. Its
global warming potential (GWP) value is 2087.5. Do
NOT vent these gases into the atmosphere.
▪ When charging refrigerant, always use protective
gloves and safety glasses.
NOTICE
If the power of some units is turned off, the charging
procedure cannot be finished properly.
NOTICE
Be sure to turn on the power 6 hours before operation in
order to have power running to the crankcase heater and
to protect the compressor.
NOTICE
If operation is performed within 12 minutes after the indoor
and outdoor units are turned on, the compressor will not
operate before the communication is established in a
correct way between outdoor unit(s) and indoor units.
NOTICE
Before starting charging procedures:
▪ In case of RXYSQ8: Check if the 7‑LEDs display is as
normal (see "6.1.4 To access mode 1 or 2" on
page 20), and there is no malfunction code on the
user interface of the indoor unit. If a malfunction code is
present, see "8.1 Solving problems based on error
codes"on page27.
▪ In case of RXYSQ10+12: Check if the 7‑segment
display indication of the outdoor unit A1P PCB is as
normal (see "6.1.4 To access mode 1 or 2" on
page 20). If a malfunction code is present, see
"8.1 Solving problems based on error codes" on
page27.
NOTICE
Make sure all connected indoor units are recognised (in
case of RXYSQ8: setting [1‑5]; in case of RXYSQ10+12:
setting [1‑10]).
NOTICE
Close the front panel before any refrigerant charge
operation is executed. Without the front panel attached the
unit cannot judge correctly whether it is operating properly
or not.
NOTICE
In case of maintenance and the system (outdoor unit+field
piping+indoor units) does not contain any refrigerant any
more (e.g., after refrigerant reclaim operation), the unit has
to be charged with its original amount of refrigerant (refer
to the nameplate on the unit) and the determined additional
refrigerant amount.
5.6.2 To determine the additional refrigerant
amount
INFORMATION
For final charge adjustment in a test laboratory, contact
your dealer.
Formula:
R=[(X
1
×Ø15.9)×0.18+(X
2
×Ø12.7)×0.12+(X
3
×Ø9.5)×0.059+
(X
4
×Ø6.4)×0.022]
R Additional refrigerant to be charged [in kg and rounded off
to 1 decimal place]
X
1...4
Total length [m] of liquid piping size at Øa
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
Ø6.4mm 0.022 Ø6mm 0.018
Ø9.5mm 0.059 Ø10mm 0.065
Ø12.7mm 0.12 Ø12mm 0.097
Ø15.9mm 0.18 Ø15mm 0.16
5.6.3 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.
a Pressure reducing valve
b Nitrogen
c Weighing scales
d Refrigerant R410A 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 Then
The determined additional
refrigerant amount is reached
Disconnect the manifold from
the liquid line.
You do not have to perform the
"Charging refrigerant (in
manual additional refrigerant
charge mode)" instructions.
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