Checks In Normal Operation; Temperature Adjustment Operation Confirmation; Service Mode Operation - Panasonic U-4ML4DPQ Installationsanleitung

Error codes on the remote controller
Malfunction
Installation error code
The stop valve of
an outdoor unit is
E3
left closed.
The stop valve of
an outdoor unit is
left closed.
E4
Insufficient
F3
refrigerant
Refrigerant
overcharge
F3
F6
Insufficient supply
U2
voltage
The check
operation is not
U3
performed.
No power is
supplied to the
U4
outdoor unit.
Improper type of
indoor units are
UA
connected.
The stop valve of
an outdoor unit is
left closed.
The piping and
wiring of the
UF
specified indoor
unit are not
connected
correctly to the
outdoor unit.
Incorrect
interconnections
UH
between units.

12.5. Checks in normal operation

Set the master unit (= indoor unit having the right to select the
cooling/heating operation mode).
In case of wired remote controllers
After the check operation, "CHANGEOVER UNDER CONTROL"
is blinking in all connected remote controllers.
Select an indoor unit to be used as the master unit in
accordance with the request from the customer.
(It is recommended to select an indoor unit which will be used
most often as the master unit.)
Press the operation mode selector button in the remote
controller of the indoor unit selected as the master unit.
In that remote controller, "CHANGEOVER UNDER CONTROL"
disappears. That remote controller will control changeover of the
cooling/heating operation mode.
In other remote controllers,
CONTROL" lights up.
U-4~6ML4DPQ
Urban Multi air conditioner
4PW29037-1
Remedial action
Open the stop valve on both the gas
and liquid side.
Open the stop valve on both the gas
and liquid side.
Check if the additional refrigerant
charge has been finished correctly.
Recalculate the required amount of
refrigerant from the piping length and
add an adequate amount of refrigerant.
Recalculate the required amount of
refrigerant from the piping length and
correct the refrigerant charge level by
recovering any excessive refrigerant
with a refrigerant recovery machine.
Check if the supply voltage is supplied
properly.
Perform the check operation.
Check if the power wiring for the
outdoor unit is connected correctly.
Check the type of indoor units that are
currently connected. If they are not
proper, replace them with proper ones.
Open the stop valve on both the gas
and liquid side.
Confirm that the piping and wiring of the
specified indoor unit are connected
correctly to the outdoor unit.
Connect correctly the interconnections
between units to the F1 and F2 (TO
IN/D UNIT) terminals on the PC board
(A1P) in the outdoor unit.
"CHANGEOVER UNDER
In case of wireless remote controllers
After the check operation, the timer lamp is blinking in all
connected indoor units.
Select an indoor unit to be used as the master unit in
accordance with the request from the customer.
(It is recommended to select an indoor unit which will be used
most often as the master unit.)
Press the operation selector mode button in the remote
controller of the indoor unit selected as the master unit. A "peep"
sound is issued, and the timer lamp turns off in all indoor units.
That indoor unit will control changeover of the cooling/heating
operation mode.
For the details, refer to the instruction manual supplied together
with the indoor unit.
12.6. Temperature adjustment operation confirmation
After the test run is over, operate the unit normally. (Heating is not
possible if the outdoor temperature is 24°C or higher.)
Make sure the indoor and outdoor units are operating normally
(If a knocking sound can be heard in the liquid compression of
the compressor, stop the unit immediately and then energize the
heater for a sufficient length of time before restarting the
operation.)
Run each indoor unit one at a time and make sure the
corresponding outdoor unit is also running.
Check to see if cold (or hot) air is coming out of the indoor unit.
Press the fan direction and fan strength buttons on the indoor
unit to see if they operate properly.
Cautions for normal operation check
Once stopping, the compressor will not restart in
about 5 minutes even if the Run/Stop button of an
indoor unit in the same system is pressed.
When the system operation is stopped by the remote
controller, the outdoor units may continue operating
for a further 1 minute maximum.
After the test run, when handling the unit over to the
customer, make sure the electric box lid, the service
lid and the unit casing are all attached properly.
13. S
ERVICE MODE OPERATION
After turning on the power supply, the unit can not be started until the
H2P initialisation led, indicating that the unit is still under preparation,
goes off (maximum 12 minutes).
Vacuuming method
At the first installation, this vacuuming is not required. It is required
only for repair purposes.
1 When the unit is at a standstill and under the setting mode 2, set
the required function B (refrigerant recovery operation/
vacuuming operation) to
ON
- After this is set, do not reset the setting mode 2 until the
vacuuming is finished.
- The H1P led is on and the remote controller indicates
(test operation) and
operation will be prohibited.
2 Vacuum the system with a vacuum pump.
3 Press the button and reset the setting mode 2.
BS1 MODE
(ON).
(external control) and the
Installation manual
19