6 Installation
Installer and user reference guide
28
RXYTQ8~16U7YF
VRV IV+ heat pump for high ambient temperatures
4P561157-1 – 2018.09
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
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
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
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
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.
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.
6
Perform
the
test
procedure
as
described
in
.
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 28
solve the malfunction accordingly. Resetting the
malfunction can be done by pushing BS3. The
procedure can be restarted from
manually charge refrigerant" on page 28
.
▪ Aborting the manual refrigerant charge is possible by
pushing BS3. The unit will stop and return to idle
condition.
6.7.7
Error codes when charging refrigerant
Code
Cause
Solution
Unusual low pressure on
suction line
Close valve A
immediately. Push BS3 to
reset. Check following
items before retrying
autocharge procedure:
▪ Check if the gas side
stop valve is opened
correctly.
▪ Check if the valve of the
refrigerant cylinder is
opened.
▪ Check if the air inlet and
outlet of the indoor unit
are not obstructed.
Freeze-up prevention
indoor unit
Close valve A
immediately. Push BS3 to
reset. Retry autocharge
procedure.
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
(e.g., RA DX indoor unit,
Hydrobox, …)
Refer to requirements to
be able to execute leak
detection operation.
