6 Installation
Installer and user reference guide
26
RXYTQ8~16T7YF
VRV IV system air conditioner
4P388989-1B – 2016.02
6.7.5
To charge refrigerant
Follow the steps as described below.
Pre-charging refrigerant
1
Calculate the additional amount of refrigerant to be added using
the formula mentioned in
"6.7.3 To determine the additional
refrigerant amount" on page 24
.
2
The first 10 kg of additional refrigerant can be pre-charged
without outdoor unit operation.
If
Then
The additional refrigerant amount
is smaller than 10 kg
Perform steps 2+3.
The additional refrigerant charge
is larger than 10 kg
Perform steps 2~8.
3
Pre-charging can be done without compressor operation, by
connecting the refrigerant bottle to the service ports of the liquid
and equalising stop valves (open valve B). Make sure that valve
A and all outdoor unit stop valves are closed.
NOTICE
During pre-charging, the refrigerant is charged through the
liquid line. Close valve A and disconnect the manifold from
the gas line.
p< p>
R410A
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
4
Do one of the following:
If
Then
4a
The calculated additional
refrigerant amount is reached
by above pre-charging
procedure
Close valves C and B and
disconnect the manifold
connection to the liquid line.
4b
The total amount of
refrigerant could not be
charged by pre-charging
Close valves C and B,
disconnect the manifold
connection to the liquid line,
and perform steps 4~8.
INFORMATION
If the total additional refrigerant amount was reached in
step 3 (by pre-charging only), record the amount of
refrigerant that was added on the additional refrigerant
charge label provided with the unit and attach it on the
back side of the front panel.
Perform
the
test
procedure
as
described
in
"8 Commissioning" on page 38
.
Charging refrigerant
5
After pre-charging, connect valve A to the refrigerant charge
port and charge the remaining additional refrigerant through this
port. Open all outdoor unit stop valves. At this point, valve A
must remain closed!
p< p>
R410A
a
c
d
b
A
a
Weighing scales
b
Refrigerant R410A tank (siphon system)
c
Vacuum pump
d
Refrigerant charge port
A
Valve A
INFORMATION
For a multi outdoor unit system, it is not required to
connect all charge ports to a refrigerant tank.
The refrigerant will be charged with ±22 kg in 1 hour time
at an outdoor temperature of 30°C DB or with ±6 kg at an
outdoor temperature of 0°C DB.
If you need to speed up in case of a multiple outdoor
system, connect the refrigerant tanks to each outdoor unit.
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.
▪ After adding the refrigerant, do not forget to close the
lid of the refrigerant charging port. The tightening
torque for the lid is 11.5 to 13.9 N•m.
▪ In order to ensure uniform refrigerant distribution, it
may take the compressor ±10 minutes to start up after
the unit has started operation. This is not a malfunction.
6
Proceed with the manual charge.
INFORMATION
After charging refrigerant:
▪ Record the additional refrigerant amount on the
refrigerant label provided with the unit and attach it to
the backside of the front panel.
▪ Perform
the
test
procedure
described
in
"8 Commissioning" on page 38
.
6.7.6
Step 6: To manually charge refrigerant
The remaining additional refrigerant charge can be charged by
operating the outdoor unit by means of the manual refrigerant
charge operation mode:
1
Take all the precautions mentioned in
"7 Configuration" on
page 31
and
"8 Commissioning" on page 38
into account.
2
Turn on the power of the indoor units and outdoor unit.
3
Activate outdoor unit setting [2‑20]=1 to start manual refrigerant
charge mode. Refer to
"7.2.8 Mode 2: Field settings" on
page 34
for details.
Result:
The unit will start operation.
4
Valve A can be opened. Charging of remaining additional
refrigerant can be done.
5
When the remaining calculated additional refrigerant amount is
added, close valve A and push BS3 to stop the manual
refrigerant charging procedure.
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