Before Operation; Service Precautions; Checks Before Initial Start-Up - Panasonic U-5MX3XPQB Installationsanleitung

Never connect 400 V to the terminal block of the interconnecting
wiring. Doing so will break the entire system.
The wiring from the indoor units must be connected to the F1/F2
(In-Out) terminals on the PC board in the outdoor unit.
After installing the interconnecting wires inside the unit, wrap
them along with the on-site refrigerant pipes using finishing
tape, as shown in figure 22.
1 Liquid pipe
2 Gas pipe
3 Interconnecting wiring
4 Insulator
5 Finishing tape
For the above wiring, always use vinyl cords with 0.75 to 1.25 mm
sheath or cables (2-core wires). (3-core wire cables are allowable for
the cooler/heater changeover remote controller only.)
In case of U-18~48MX3
The interconnecting wiring between the outdoor units in the
same pipe line must be connected to the Q1/Q2 (Out Multi)
terminals. Connecting the wires to the F1/F2 (Out-Out) terminals
results in system malfunction.
The wiring for the other lines must be connected to the F1/F2
(Out-Out) terminals of the P-board in the outdoor unit to which
the interconnecting wiring for the indoor units is connected.
The base unit is the outdoor unit to which the interconnecting
wiring for the indoor units is connected.
The interconnecting wiring between the outdoor units must be
≤30 m.
See the paragraph "Fixing field line connection" on page 15.
Be sure to keep the power line and transmission line
apart from each other.
Be careful about polarity of the transmission line.
Make sure that the transmission line is clamped as
shown in the figure in "Field line connection" in
chapter "7.5. Examples" on page 14.
Check that wiring lines do not make contact with
refrigerant piping.
Firmly close the lid and arrange the electrical wires so
as to prevent the lid or other parts from coming loose.
When you do not use a wire conduit, be sure to
protect the wires with vinyl tubes etc, to prevent the
edge of the knock-out hole from cutting the wires.
U-5~48MX3XPQB
Urban Multi air conditioner
4PW21867-1A
8. B
EFORE OPERATION
8.1.

Service precautions

WARNING: ELECTRIC SHOCK
Caution when
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
2
capacitor in the main circuit is not higher than
50 V DC.
Then pull out the connector (N3, P3). Please pay
attention not to come in contact with live parts.
After the service is finished, re-connect the connector
(N3, P3). Otherwise malfunction may occur.
Caution when obtaining access to terminals
Before obtaining access to terminals in the switch
box, all supply circuits must be disconnected.
Be careful when taking off the cover. Touching live
parts may cause electric shock.
After servicing is finished, re-attach the cover.
Otherwise malfunction may occur due to intrusion of
water or other foreign materials.
Play it safe!
NOTE
For protection of the PCB, touch the switch box casing
by hand in order to eliminate static electricity from your
body before performing service.

8.2. 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 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.
2 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.
3 Pipe sizes and pipe insulation
Make sure that correct pipe sizes are installed and that the
insulation work is properly executed.
performing service to inverter
N3 P3
Installation manual
16