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6.
ELECTRICAL WIRING
CAUTION
To those doing electrical work
• Do not operate the unit before completing refrigerant piping
connection. (Failure to do so will result in compressor
malfunction.)
• Install the earth leakage circuit breaker. (Since this unit is
equipped with an inverter, to prevent malfunction of the earth
leakage circuit breaker itself, select the breaker that be
capable of handling high harmonics.)
6-1 Example of whole system wiring connection
• Be sure to install the earth leakage circuit breaker to prevent
electric shock and fire hazard, etc.
• The electrical wiring must be installed by the trained electricians.
• Perform wiring connection in accordance with "Electrical Wiring
Diagram Label".
Only conduct the wiring connection after turning off the branch
circuit breaker and the over current circuit breaker.
• The grounding impedance must be 4Ω or less.
• Set the earth leakage circuit breaker.
• Earth the indoor and outdoor units.
• Do not connect the earth wire to the gas pipes, water pipes,
lightning rods or telephone earth wires.
- Gas pipes: gas leaks can cause explosion or fire.
- Water pipes: cannot be grounded if hard vinyl pipes are used.
- Telephone earth wires or lightning rods: the ground
potential when struck by lightning may get extremely high.
• Only use the copper wires.
• Be sure to turn off the power supply before performing the
electrical wiring work. Do not switch on the breakers until all
wiring work being completed.
• Install the earth leakage circuit breaker.
(Since this unit is equipped with an inverter, to prevent
malfunction of the earth leakage circuit breaker itself, select the
breaker that be capable of handling high harmonics.)
• Connect the power wiring and the power supply terminal blocks
as shown in the following figure and tighten the clamps.
• Fuse models of the outdoor unit:
F1U (T6.3A/250V)
F6U (T3.15A/250V)
• The unit is equipped with an inverter. Always connect the earth
wire to discharge the unit and eliminate the impact on other
devices by reducing the noise generated from the inverter, and
to prevent the unit casing from being live due to electric leakage.
• Never install a phase advancing capacitor to improve the power
factor. (Installing a phase advancing capacitor will not improve
the power factor, but may cause the capacitor abnormal heating
and accidents.)
• For the wiring, use the designated electric wires and connect
firmly, then secure them with the accessory clamps to prevent
outside force from being applied to the terminal area (terminals
of the transmission wiring and earth wire connected on site).
For details, please refer to 6-3 Precautions to power wiring
connection.
• Do not tie the remaining wires in a bunch and tuck into the unit.
• Place the electric wires in the conduits or plastic sleeves to prevent
them from being scratched by the edge of the knockout hole.
• Secure the electric wires with the accessory buckles to prevent it
from touching the piping and stop valves (Refer to 6-3 Precautions
to power wiring connection.)
8
CAUTION
• Use the sheathed wires for the power wiring.
• Do not route the weak electric wiring (remote controller wire
and wiring between units) together with the strong one
outside the air conditioner, keeping them at least 50mm
apart. Otherwise, being affected by the electrical noise
(external noise) may result in malfunction or breakdown.
• Be sure to connect the power wiring to the power supply
terminal blocks and hold it in place in accordance with
6-3 Precautions to power wiring connection.
• Hold the wiring between air conditioner units in place in
accordance with 6-4 Precautions to wiring connection
between units.
• Secure the electric wires using the accessory clamps to
prevent it from touching the piping, etc.
• After connecting the electric wires, lay the wires in a
smooth and regular way to avoid the electronic component
box cover being protruded, then close the cover tightly.
Power supply
Branch circuit
Outdoor unit
B
breaker & over
current circuit
breaker (earth
leakage circuit
breaker)
380-415V
Earth
6-2 Precautions to lead out power wiring and
transmission wiring
Lead out the power wiring (including the earth wire) from the power
wiring outlets at the sides, front or back of the units.
Lead out the electric wires between units from the wiring outlet,
piping outlet or knockout holes in the front of the units.
[Precautions when punching through the knockout
holes]
• Punch through the knockout holes with a hammer.
• After punching through the holes, it is recommended to coat the
holes at the edge and the area around them with anti-corrosion
paint to prevent rusting.
• Before leading the electric wires through the knockout holes,
scrape the burrs around the holes and wrap the wires with the
protective tape.
If small animals might enter the unit,
Burrs
block off the knockout holes with sealing
material (field supply)
Terminal block
Clamps
(accessories)
Knockout holes
Electric wires
between units
Power wiring
(including the earth
wire)
When connecting
from the front
Keep proper distance
Power
supply
B
220-240V
Indoor unit
16V
16V
Earth
Remote
controller
Outdoor unit PC board
terminals F1, F2
(TO IN/D UNIT)
Stop valve
mounting plate
Electric wires
between units
Power wiring
(including the earth
wire)
When connecting
from the back
Electric wires
between units
Power wiring
(including the earth
wire)
When connecting
from the side
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