Checks After Adding Refrigerant; Before Operation; Service Precautions - Panasonic U-5MX4XPQ Manuel D'installation

5 Final adjustment of the amount of refrigerant
When the unit displays an out of temperature range, the
automatic charging of refrigerant can not be completed.
Out of outdoor temperature range
H1P H2P H3P H4P H5P H6P H7P
w c c c w x x
Complete the charging of refrigerant on another time when
the outdoor temperature is warmer than 0°C DB and colder
than 43°C DB.
Out of indoor temperature range
H1P H2P H3P H4P H5P H6P H7P
w c c c x w x
Complete the charging of refrigerant on another time when
the indoor temperature is warmer than 20°C DB and colder
than 32°C DB.
In this case, perform a test operation (as explained in the
chapter "12.4. Test operation" on page 25) and the unit will work
properly. (The malfunction code U3 will be displayed on the
indoor unit.)
However, the refrigerant leak detection function can not be used
before completing the refrigerant charging operation and the
judgement of the initial amount of refrigerant by performing the
test operation again.
When the temperature has come in range (outdoor = 0~43°C,
indoor = 20~32°C), perform
procedure for completion of the refrigerant charging operation.
Overcharging judgement procedure
1 Close all the front panels except the electric box front panel and
the lid on the side of the electric box.
2 Turn on the power to the outdoor unit and all the connected
indoor units.
3 Press the button once and set the setting model
BS1 MODE
H1P = OFF.
4 Press and hold the
BS4 TEST
The system will start operating.
5 Close all the front panels.
After operating for 40 minutes, the operation will stop
automatically.
6 After the system has stopped operating, check the display on
the remote controller.
7 If E3, F6 or UF is displayed on the remote controller as a result of
the overcharge judging operation, recover 20% of the charged
amount of refrigerant and perform the overcharge judgement
procedure again.
When there is no more overcharging of refrigerant detected,
restart the automatic refrigerant charging from Start of
automatic charging refrigerant as explained page 18 again.

11.5. Checks after adding refrigerant

Are the stop valves for both liquid and gas open?
Is the amount of refrigerant, that has been added, recorded?
Make sure to open the stop valves after charging the
refrigerant.
Operating with the stop valves closed will damage the
compressor.
U-5~18MX4XPQ
Urban Multi air conditioner
4PW28163-1C
the overcharging judgement
button down for 5 seconds.
12. B
EFORE OPERATION
12.1.

Service precautions

WARNING: ELECTRIC SHOCK
Caution when performing
equipment
1 Do not open the electric box cover for 10 minutes after
the power supply is turned off.
2 Measure the voltage between terminals on the
terminal block for power supply with a tester and
confirm that the power supply is shut off.
In addition, measure the points, as shown in the figure
below, with a tester and confirm that the voltage of the
capacitor in the main circuit is less than 50 V DC.
A2P A2P
TP1 TP2
3 To prevent damaging the PC-board, touch a
noncoated metal part to eliminate static electricity
before pulling out or plugging in connectors.
4 The performing of the service to the inverter
equipment must be started after the junction
connectors X1A, X2A, X3A, X4A (X3A and X4A are
for 14~18 unit type only) for the fan motors in the
outdoor unit are been pulled out. Be carefull not to
touch the live parts.
(If a fan rotates due to strong wind, it may store
electricity in the capacitor or in the main circuit and
cause electric shock.)
5 After the service is finished, plug the junction
connecter back in. Otherwise the error code E7 will be
displayed on the remote controller and normal
operation will not be performed.
For details refer to the wiring diagram labeled on the back
of the electric box cover.
Pay attention to the fan. It is dangerous to inspect the unit while the
fan is running. Be sure to turn off the main switch and to remove the
fuses from the control circuit located in the outdoor unit.
NOTE Play it safe!
For protection of the PCB, touch the switch box casing
by hand in order to eliminate static electricity from your
body before performing service.
service to inverter
A1P
A3P
Installation manual
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