14 Piping installation
Installation and operation manual
25
RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P546223-1C – 2021.11
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
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
14.4.6
Step 6: To manually charge refrigerant
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"
25] and solve the
malfunction accordingly. Resetting the malfunction can
be done by pushing BS3. The procedure can be
restarted from
"14.4.6 Step 6: To manually charge
25].
▪ Aborting the manual refrigerant charge is possible by
pushing BS3. The unit will stop and return to idle
condition.
14.4.7
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.
Other
malfunction
code
—
Close valve A
immediately. Confirm the
malfunction code and take
corresponding action,
"19.1 Solving problems
based on error
codes"
33].
14.4.8
Checks after charging refrigerant
▪ Are all stop valves open?
▪ Is the amount of refrigerant, that has been added, recorded on the
refrigerant charge label?
NOTICE
Make sure to open all stop valves after (pre-) charging the
refrigerant.
Operating with the stop valves closed will damage the
compressor.
