Power Circuit And Cable Requirements; General Cautions; System Examples - Panasonic URBAN MULTI U-8ME4XPQ Manuel D'installation

8.3.

Power circuit and cable requirements

A power circuit (see table below) must be provided for connection of
the unit. This circuit must be protected with the required safety
devices, i.e. a main switch, a slow blow fuse on each phase and an
earth leakage breaker.
Phase and
frequency Voltage
U-8XPQ 3 N~50 Hz 380~415 V
U-10XPQ 3 N~50 Hz 380~415 V
U-12XPQ 3 N~50 Hz 380~415 V
U-14XPQ 3 N~50 Hz 380~415 V
U-16XPQ 3 N~50 Hz 380~415 V
When using residual current operated circuit breakers, be sure to use
a high-speed type 300 mA rated residual operating current.
Be sure to install a main switch for the complete system.
NOTE Select the power supply cable in accordance with
relevant local and national regulations.
Wire size must comply with the applicable local
and national code.
Specifications for local wiring power cord and
branch wiring are in compliance with IEC60245.
WIRE TYPE H05VV(*)
*Only in protected pipes (use H07RN-F when
protected pipes are not used).
8.4.

General cautions

Make sure to connect the power source wire to the power
source terminal block and to clamp it as shown in figure 24 and
described in chapter "8.8. Field line connection: power wiring"
on page 13.
For conditional connections, refer to the Technical Data.
As this unit is equipped with an inverter, installing a phase
advancing capacitor not only will deteriorate power factor
improvement effect, but also may cause a capacitor abnormal
heating accident due to high-frequency waves. Therefore, never
install a phase advancing capacitor.
Keep power imbalance within 2% of the supply rating.
• Large imbalance will shorten the life of the smoothing
capacitor.
• As a protective measure, the product will stop operating and
an error indication will be made, when power imbalance
exceeds 4% of the supply rating.
Follow the "electrical wiring diagram" supplied with the unit when
carrying out any electrical wiring.
Only proceed with wiring work after all power is shut off.
Always ground wires. (In accordance with national regulations of
the pertinent country.)
Do not connect the ground wire to gas pipes, sewage pipes,
lightning rods or telephone ground wires. This may cause
electric shock.
• Combustion gas pipes: can explode or catch fire if there is a
gas leak.
• Sewage pipes: no grounding effect is possible if hard plastic
piping is used.
• Telephone ground wires and lightning rods: dangerous when
struck by lightning due to abnormal rise in electrical potential
in the grounding.
This unit uses an inverter and therefore generates noise, which
will have to be reduced to avoid interfering with other devices.
The outer casing of the product may take on an electrical charge
due to leaked electrical current, which will have to be discharged
with the grounding.
U-8~16ME4XPQ
Urban Multi air conditioner
4PW40726-1A
Minimum
circuit Recommended Transmission
ampere fuses line section
17.1 A 20 A 0.75~1.25 mm
22.1 A 25 A 0.75~1.25 mm
22.3 A 25 A 0.75~1.25 mm
32.8 A 40 A 0.75~1.25 mm
33.0 A 40 A 0.75~1.25 mm
Be sure to install an earth leakage breaker. (One that can
handle high-frequency electrical noise.)
(This unit uses an inverter, which means that an earth leakage
breaker capable of handling high-frequency electrical noise
must be used in order to prevent malfunctioning of the earth
leakage breaker itself.)
Earth leakage breakers that are especially designed for
protecting ground-faults must be used in conjunction with main
switch and fuse for use with wiring.
2
2 Never connect the power supply in reversed phase.
2 The unit can not operate normally in reversed phase. If you
2 connect in reversed phase, replace two of the three phases.
2
This unit has a reverse phase detection circuit. (If it is activated,
only operate the unit after correcting the wiring.)
Power supply wires must be attached securely.
If the power supply has a missing or wrong N-phase, equipment
will break down.
Make sure that all wiring is secure, the specified wires are used,
and no external forces act on the terminal connection or wires.
Improper connections or installation may result in fire.
When wiring the power supply and connecting the remote
controller wiring and transmission wiring, position the wires so
that the control box lid can be securely fastened.
Improper positioning of the control box lid may result in electric
shocks, fire or overheating of the terminals.
8.5.

System examples

(See figure 15)
1 Field power supply
2 Main switch
3 Earth leakage circuit
breaker
4 Fuse
Power supply wiring (sheathed cable) (380~415 V)
Transmission wiring (sheathed cable) (16 V)
5 Outdoor unit
6 Cool/heat selector
7 Remote controller
8 Indoor unit
9 HR unit
Installation manual
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