Power Circuit And Cable Requirements; General Cautions - Panasonic U-5MX4XPQ Installation Manual

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-5MX4 3 N~50 Hz 400 V
U-8MX4 3 N~50 Hz 400 V
U-10MX4 3 N~50 Hz 400 V
U-12MX4 3 N~50 Hz 400 V
U-14MX4 3 N~50 Hz 400 V
U-16MX4 3 N~50 Hz 400 V
U-18MX4 3 N~50 Hz 400 V
U-20MX4 3 N~50 Hz 400 V
U-22MX4 3 N~50 Hz 400 V
U-24MX4 3 N~50 Hz 400 V
U-26MX4 3 N~50 Hz 400 V
U-28MX4 3 N~50 Hz 400 V
U-30MX4 3 N~50 Hz 400 V
U-32MX4 3 N~50 Hz 400 V
U-34MX4 3 N~50 Hz 400 V
U-36MX4 3 N~50 Hz 400 V
U-38MX4 3 N~50 Hz 400 V
U-40MX4 3 N~50 Hz 400 V
U-42MX4 3 N~50 Hz 400 V
U-44MX4 3 N~50 Hz 400 V
U-46MX4 3 N~50 Hz 400 V
U-48MX4 3 N~50 Hz 400 V
U-50MX4 3 N~50 Hz 400 V
U-52MX4 3 N~50 Hz 400 V
U-54MX4 3 N~50 Hz 400 V
NOTE The above table indicates power specifications for
standard combinations. See
page 1.
If using anything other than the above combinations in
a multiple outdoor unit system, calculate using the
following procedure.
Calculate the recommended fuse capacity
Calculate, by adding the minimum circuit ampere
of each used unit (according to the table above),
multiply the result by 1.1 and select the next
higher recommended fuse capacity.
Example
Combining the U-30MX4 by using the U-8MX4,
U-10MX4, and U-12MX4.
Minimum circuit ampere of the U-8MX4 = 18.5 A
Minimum circuit ampere of the U-12MX4 = 21.6 A
Minimum circuit ampere of the U-12MX4 = 22.7 A
Accordingly, the minimum circuit ampere of the
U-30MX4=18.5+21.6+22.7= 62.8 A
Multiplying
(62.8 x 1.1)=69.08 A, so the recommended fuse
capacity would be 80 A.
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).
U-5~18MX4XPQ
Urban Multi air conditioner
4PW28163-1
Minimum
circuit Recommended Transmission line
ampere fuses section
11.9 A 16 A 0.75~1.25 mm
18.5 A 32 A 0.75~1.25 mm
21.6 A 32 A 0.75~1.25 mm
22.7 A 32 A 0.75~1.25 mm
31.5 A 50 A 0.75~1.25 mm
31.5 A 50 A 0.75~1.25 mm
32.5 A 50 A 0.75~1.25 mm
41.2 A 63 A 0.75~1.25 mm
44.3 A 63 A 0.75~1.25 mm
50.4 A 63 A 0.75~1.25 mm
51.0 A 63 A 0.75~1.25 mm
54.1 A 63 A 0.75~1.25 mm
55.2 A 80 A 0.75~1.25 mm
63.0 A 80 A 0.75~1.25 mm
64.0 A 80 A 0.75~1.25 mm
65.0 A 0.75~1.25 mm
80 A
73.7 A 100 A 0.75~1.25 mm
81.5 A 100 A 0.75~1.25 mm
82.5 A 100 A 0.75~1.25 mm
83.5 A 100 A 0.75~1.25 mm
86.6 A 100 A 0.75~1.25 mm
87.7 A 100 A 0.75~1.25 mm
96.5 A 125 A 0.75~1.25 mm
96.5 A 125 A 0.75~1.25 mm
97.5 A 125 A 0.75~1.25 mm
"1. Introduction"
the above result by
8.4.

General cautions

Up to 3 units can be connected by crossover power source
wiring between outdoor units. However, units of smaller capacity
must be connected downstream. For details, refer to the
technical data.
When connecting several units in Urban Multi combination, the
power supply of each outdoor unit can also be connected
separately. Refer to the field wiring on the engineering data book
2
for further details.
2
Make sure to connect the power source wire to the power
2
source terminal block and to clamp it as shown in figure 21 and
2
described in chapter "8.8. Field line connection: power wiring"
2
on page 14.
2
2
As this unit is equipped with an inverter, installing a phase
2
advancing capacitor not only will deteriorate power factor
2
improvement effect, but also may cause capacitor abnormal
2
heating accident due to high-frequency waves. Therefore, never
2
install a phase advancing capacitor.
2
Keep power imbalance within 2% of the supply rating.
2
• Large imbalance will shorten the life of the smoothing
2
capacitor.
2
• As a protective measure, the product will stop operating and
2
an error indication will be made, when power imbalance
2
exceeds 4% of the supply rating.
2
2
Follow the "electrical wiring diagram" supplied with the unit when
2
carrying out any electrical wiring.
2
Only proceed with wiring work after all power is shut off.
2
Always ground wires. (In accordance with national regulations of
2
the pertinent country.)
2
Do not connect the ground wire to gas pipes, sewage pipes,
2
lightning rods, or telephone ground wires. This may cause
electric shock.
• Combustion gas pipes: can explode or catch fire if there is a
on
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.
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
1.1
protecting ground-faults must be used in conjunction with main
switch and fuse for use with wiring.
Never connect the power supply in reversed phase.
The unit can not operate normally in reversed phase. If you
connect in reversed phase, replace two of the three phases.
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.
Installation manual
12