Before Operation; Service Precautions; Checks Before Initial Start-Up; Field Setting - Panasonic U-4ML3DPQ Installationsanleitung

11. B
EFORE OPERATION

11.1. Service precautions

WARNING: ELECTRIC SHOCK
Caution when performing
equipment
Do not touch live parts for 10 minutes after the power
supply is turned off because of high voltage risk.
Additionaly, measure the points as shown in the figure
with a tester and confirm that the voltage of the
capacitor in the main circuit is no more than 50 V DC.
A3P
A
1
1 Fan connections of outdoor unit
A Front view
B View B
Make sure that the power supply is turned off before
performing the maintenance work. The heater of the
compressor may operate even in stop mode.
Please note that some sections of the electric
component box are extremely hot.
In order to prevent damage to the PCB, first eliminate
static electricity by touching a metal part (e.g. stop
valve) with your hand. Then pull out the connector.
After measuring the residual voltage, pull out the
outdoor fan connector.
Make sure you do not touch a conductive section.
The outdoor fan may rotate due to strong backblow
wind, causing the capacitor to charge. This may result
in an electric shock.
After maintenance, make sure the outdoor fan connector is
connected again. Otherwise, the unit may break down.
Play it safe!
Touch a metal part by hand (such as the stop valve) in
order to eliminate static electricity and to protect the PCB
before performing service.

11.2. Checks before initial start-up

Make sure that the circuit breaker on the power supply
panel of the installation is switched off.
Attach the power wire securely.
Introducing power with a missing N-phase or with a
mistaken N-phase will break the equipment.
After the installation, check the following before switching on the
circuit breaker:
1 Transportation fittings
Be sure that the transportation fittings are removed from the
compressor.
2 The position of the switches that require an initial setting
Make sure that switches are set according to your application
needs before turning the power supply on.
Installation manual
14
service to inverter
A2P
L1R
B
C+ C-
B
3 Power supply wiring and transmission wiring
Use a designated power supply and transmission wiring and
make sure that it has been carried out according to the
instructions described in this manual, according to the wiring
diagrams and according to local and national regulations.
4 Pipe sizes and pipe insulation
Make sure that correct pipe sizes are installed and that the
insulation work is properly executed.
5 Additional refrigerant charge
The amount of refrigerant to be added to the unit should be
written on the included "Added Refrigerant" plate and attached
to the rear side of the front cover.
6 Insulation test of the main power circuit
Using a megatester for 500 V, check that the insulation
resistance of 2 MΩ or more is attained by applying a voltage of
500 V DC between power terminals and earth. Never use the
megatester for the transmission wiring.
7 Stop valves
Be sure that the stop valves are open on both liquid and gas
side.

11.3. Field setting

If required, carry out any field setting according to the following
instructions. Refer to the service manual for more details.
Handling the switches
When carrying out field settings, operate the
switches with an insulated stick (such as a ball-
point pen) to avoid touching of live parts.
Location of the dipswitches, leds and buttons
1 Led H1P~H7P
2 Push button switches BS1~BS5
3 Dip switch 2 (DS2: 1~4)
4 Dip switch 1 (DS1: 1~4)
Led state
Throughout the manual the state of the leds is indicated as follows:
OFF
ON
blinking
Setting the dip switches DS1 and DS2
What to set with dip switch DS1
1 COOL/HEAT selector
( = not installed = factory setting)
OFF
2~4 NOT USED
DO NOT CHANGE THE FACTORY SETTING.
What to set with dip switch DS2
1~4 NOT USED
DO NOT CHANGE THE FACTORY SETTING.
1
2
3
4
A1P
U-4~6ML3DPQ
Urban Multi air conditioner
4PW17809-1C