18 | Piping installation
Installer and user reference guide
100
RXMLQ8 + RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543427-1A – 2020.10
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 13.9N•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.
5 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 "21Commissioning"[4133].
18.4.6 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 "20 Configuration" [4 113] and
"21Commissioning"[4133] 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 "Mode 2: Field settings"[4120] 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.
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 "21Commissioning"[4133].
18.4.7 Checks after charging refrigerant
▪ Are all stop valves open?
▪ Is the amount of refrigerant, that has been added, recorded on the refrigerant
charge label?
NOTICE
Make sure to open all stop valves after (pre-) charging the refrigerant.
Operating with the stop valves closed will damage the compressor.
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