250B8W1B
Split system air conditioner
4PW25544-1A
Installation manual
12
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
chapter "Field line connection".
■
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 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.
■
Only proceed with wiring work after switching off all power
sources.
■
Always ground wires. (In accordance with local regulations.)
■
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.
■
Be sure to install an earth leakage breaker. (One that can
handle higher harmonics.)
(This unit uses an inverter, which means that an earth leakage
breaker capable of handling high harmonics needs to be used in
order to prevent malfunctioning of the earth leakage breaker
itself.)
■
Earth leakage breakers which are especially designed for
protecting ground-faults must be used in conjunction with main
switch and fuse for use with wiring.
■
This unit has a reverse phase protection circuit. (If it operates,
only operate the unit after correcting the wiring.)
■
Power supply wires must be attached securely.
■
If the power supply would have a missing N-phase or a mistaken
N-phase, equipment will break down.
■
Make sure that all wiring is secured, 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 the overheating of the terminals.
8.5.
Examples
System example
Field line connection
L1, L2, L3, N-phase of the power cord should be clamped to the
plastic bracket using field supplied clamp material.
The green and yellow striped wrapped wires should be used for
grounding.
See
1
Field power supply
2
Main switch
3
Earth leakage breaker
4
Fuse
5
Remote controller
Power supply wiring (sheathed cable)
Transmission wiring (sheathed cable)
1
Power supply (400 V, Three-phase)
2
Fuse
3
Grounding wire
4
Earth leakage breaker
5
Attach insulation sleeves
6
Power supply terminal block
7
Ground wire
8
Clamp the ground wires along with the power wires using field
supplied clamps.
9
Clamp each power wire separately to the plastic brackets using
field supplied clamps.
10
When wiring, do not allow the ground wires to contact the
compressor lead wires. If the wires contact each other, adverse
effects may occur to other units.
11
When connecting two wires to one terminal, ensure that the
crimp-style terminals face with each other back to back.
Moreover, make sure that the wire of the smaller gauge is located
above.
12
Crimp-style terminal
13
Wire gauge: Small
14
Wire gauge: Large
15
Plastic bracket
1
Power supply wiring
2
Wiring between units
3
Clamp to the electric box with field supplied clamps.
4
Grounding wire
5
Clamp to the back of the column support with field supplied
clamps.
6
When routing out the power/ground wires from the right side:
7
When wiring, pay attention not to detach the acoustic insulators
from the compressor.
8
Optional wiring
9
When routing out the power/ground wires from the front:
10
Wiring for power consumption limitation setting (
)
(optional)
11
When routing out the inter-unit wirings from the opening for piping:
12
When routing out the ground wires from the left side:
13
When routing the remote control cord and inter-unit wiring, secure
clearance of 50 mm or more from the power wiring. Ensure that
the power wiring does not contact any heated sections (
).
DEMAND
