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5 Installation
Installation and operation manual
15
RXYSQ4~6TAY1B
VRV IV-S system air conditioner
4P482256-1 – 2017.03
NOTICE
Make sure all connected indoor units are recognised
(setting [1‑5]).
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
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
×
Ø9.5
)×0.059+(X
2
×
Ø6.4
)×0.022]
R
Additional refrigerant to be charged [in kg and rounded off
to 1 decimal place]
X
1...2
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
Ø6.4 mm
0.022
Ø6 mm
0.018
Ø9.5 mm
0.059
Ø10 mm
0.065
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.
p< p>
N2
C
b
c
e
a
g
f
d
A
B
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.
Too much
refrigerant is
charged
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.
The determined additional
refrigerant amount is
not
reached
yet
Disconnect the manifold from
the liquid line.
Continue with the "Charging
refrigerant (in manual
additional refrigerant charge
mode)" instructions.
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>
R410A
a
c
d
b
A
d
a
Weighing scales
b
Refrigerant R410A tank (siphon system)
c
Vacuum pump
d
Refrigerant charge port
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
and
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
"6.1.8 Mode 2: Field settings" on
.
Result:
The unit will start operation.
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