Before Operation; Service Precautions; Checks Before Initial Start-Up; Field Setting - Panasonic U-4ML5DPQ Manual De Instalación

12. B
EFORE OPERATION

12.1. Service precautions

WARNING: ELECTRIC SHOCK
Caution when performing service to inverter equipment
Do not touch live parts for 10 minutes after the power supply is
turned off because of high voltage risk.
Additionally, 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.
DPQ
A1P
X106A X107A
A2P
A4P
X2M
A1P
XPQ
C+
C–
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.
U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
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.

12.2. Checks before initial start-up

NOTE Note that during the first running period of the unit,
required power input may be higher than stated on the
nameplate of the unit. This phenomenon originates
from the compressor that needs elapse of a 50 hours
run in period before reaching smooth operation and
stable power consumption.
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 stay
Be sure that the transportation stay is 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.
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.
8 Drain pipe installation
Make sure that the drain piping is installed properly.

12.3. 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.
Installation manual
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