Daikin REMQ5U7Y1B, Installer And User Reference Manual

Page: 106 / 176

18 | Piping installation
Installer and user reference guide
106
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
Cooling (middle 7‑segment display indicates " ")
Automatic charging will continue, the 7‑segment display indication shows the
current low pressure value and the status indication "
" intermittent.
If the 7‑segment display indication/user interface of indoor unit shows " " code,
charging is almost finished. When the unit stops operating, close valve A
immediately and check whether the 7‑segment display indication/user interface of
indoor unit shows "
". This indicates the automatic charging in cooling program
was finished successfully.
INFORMATION
When the charging amount is little, the " " code may not be displayed, but instead
the " " code will be displayed immediately.
When the required (calculated) additional refrigerant amount is already charged
before "
" or " " indication appears, close valve A and wait till " " is displayed.
If during the cooling operation for the automatic refrigerant charge the ambient
conditions go beyond the allowable for this operation mode, the unit will indicate
on the 7‑segment display "
" in case indoor temperature is out of range or " "
in case the outdoor temperature is out of range. In this case, when the additional
refrigerant charging was not finished, step
"Step 6a: To automatically charge
refrigerant" [
4
104] has to be repeated.
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
"24.1 Solving
problems based on error codes" [
4
154] and solve the malfunction accordingly.
Resetting the malfunction can be done by pushing BS1. The procedure can be
restarted from
"Step 6a: To automatically charge refrigerant" [
4
104].
▪
Aborting the automatic refrigerant charge is possible by pushing BS1. The unit will
stop and return to idle condition.
Perform the test procedure as described in "21 Commissioning" [
4
145].
18.4.7 Step 6b: 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
122] and
"21 Commissioning" [ 4 145] 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" [
4
129] 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.