Checks After Adding Refrigerant; Before Operation; Service Precautions - Panasonic U-8ME4XPQM Manuel D'installation

3 Press the BS2 SET button 14 times.
The LED display must be as follows:
H1P H2P H3P H4P H5P H6P H7P
w x x w w w x
Press the button once as confirmation of the
BS3 RETURN
LEDs combination.
LEDs will be blinking in function of the last entered setting
(factory setting = 0 kg).
4 The weighed and already recorded amount of additional
refrigerant charge (not the total amount of refrigerant present in
the system) must be entered by selecting the corresponding
LED display.
Scroll through the possible LED combinations by pressing the
button until the LED combination corresponds to the
BS2 SET
weight of additional refrigerant charge you must input.
Select the required input by pressing the
and confirm the input into the PCB by pressing the
button again.
BS3 RETURN
Possible LED combinations in function of weight of additional
refrigerant charge (= x) to input;
kg
H1P H2P H3P H4P H5P H6P H7P
w x x x x x x
0 x=0
w x x x x x w
1 0<x<5
w x x x x w x
2 5≤x<10
w x x x x w w
3 10≤x<15
w x x x w x x
4 15≤x<20
w x x x w x w
5 20≤x<25
w x x x w w x
6 25≤x<30
w x x x w w w
7 30≤x<35
w x x w x x x
8 35≤x<40
w x x w x x w
9 40≤x<45
w x x w x w x
10 45≤x<50
w x x w x w w
11 50≤x<55
w x x w w x x
12 55≤x<60
w x x w w x w
13 60≤x<65
w x x w w w x
14 65≤x<70
w x x w w w w
15 70≤x<75
w x w x x x x
16 75≤x<80
w x w x x x w
17 80≤x<85
w x w x x w x
18 85≤x<90
w x w x x w w
19 90≤x<95
w x w x w x x
20 95≤x<100
w x w x w x w
21 100≤x
5 Return to setting mode 1 (= initial state) by pressing the
button.
BS1 MODE
NOTE If you get confused in the middle of the input
process, press the
setting mode 1 (= initial state).
The H1P LED is off
Resume the input procedure from step 2 onwards.
Perform a test operation as described in "12.4. Test operation" on
page 25.
U-8~16ME4XPQM
Urban Multi air conditioner
4PW40728-1
button
BS3 RETURN
button to return to
BS1 MODE
x
.

11.7. 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.
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+16 unit type only) for the fan motors in the
outdoor unit are been pulled out. Be careful 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 labelled 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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