16 Charging refrigerant
Installation and operation manual
38
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P684060-1 – 2022.02
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R32
a
c
b
B
d
a
Weighing scales
b
Refrigerant R32 tank (siphon system)
c
Vacuum pump
d
Liquid line stop valve
B
Valve B
4
Do one of the following:
If
Then
a
The determined
additional refrigerant
amount is
not reached
yet
Close valve B and disconnect the
manifold from the liquid line.
Continue with the "Charging
refrigerant " procedure as described
below.
b
The determined
additional refrigerant
amount is
reached
Close valve B and disconnect the
manifold from the liquid line.
You do not have to perform the
"Charging refrigerant" instructions
described below.
c Too much
refrigerant is
charged
Recover refrigerant.
Disconnect the manifold from the
liquid line.
You do not have to perform the
"Charging refrigerant" instructions
described below.
Charging refrigerant
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. Open all
outdoor unit stop valves.
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R32
a
c
d
b
A
a
Weighing scales
b
Refrigerant R32 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 ±1 kg per minute.
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.
Prerequisite:
Turn on the power of the indoor units and outdoor
unit.
6
Activate setting [2‑20] to start the manual additional refrigerant
charge mode. For details, see
44].
Result:
The unit will start operation.
7
Open valve A and charge refrigerant until the remaining
determined additional refrigerant amount is added, and then
close valve A.
8
Close valve A and press BS3 to stop the manual additional
refrigerant charge mode.
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
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.
▪ Input the additional refrigerant amount into the system
via setting [2‑14].
▪ Perform
the
test
procedure
described
in
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.
16.6
Error codes when charging
refrigerant
Code
Cause
Solution
Indoor unit is out of
temperature range for leak
detection operation
Retry when ambient
conditions are satisfied.
Outdoor unit is out of
temperature range for leak
detection operation
Retry when ambient
conditions are satisfied.
Indicates an indoor unit
which is not compatible
with leak detection
functionality is installed
Refer to requirements to
be able to execute leak
detection operation.
Other
malfunction
code
—
Close valve A
immediately. Confirm the
malfunction code and take
corresponding action,
"21.1 Solving problems
based on error
codes"
16.7
Checks after charging refrigerant
▪ Are all stop valves open?
▪ Is the amount of refrigerant, that has been added, recorded on the
refrigerant charge label?
