5 Installation
Installation and operation manual
13
RXYSQ6T8Y1B9
VRV IV-S system air conditioner
4P482276-1 – 2017.04
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.
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.
INFORMATION
▪ When a malfunction is detected during the procedure
(e.g., in case of closed stop valve), a malfunction code
will be displayed. In that case, refer to
codes when charging refrigerant" on page 14
and
solve the malfunction accordingly. Resetting the
malfunction can be done by pushing BS3. You can
restart the "Charging" instructions.
▪ Aborting the manual refrigerant charge is possible by
pushing BS3. The unit will stop and return to idle
condition.
10
Open valve A.
11
Charge refrigerant until the remaining determined additional
refrigerant amount is added, and then close valve A.
12
Press BS3 to stop the manual additional refrigerant charge
mode.
NOTICE
Make sure to open all stop valves after (pre-) charging the
refrigerant.
Operating with the stop valves closed will damage the
compressor.
NOTICE
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.
