28
4. ELECTRICAL WIRING
4-1. General Precautions on Wiring
(1) Before wiring, confirm the rated voltage of the unit as
shown on its nameplate, then carry out the wiring closely
following the wiring diagram.
WARNING
CAUTION
(2) This equipment is strongly recommended to be
installed with Earth Leakage Circuit Breaker (ELCB)
or Residual Current Device (RCD). Otherwise,
it may cause electrical shock and fire in case of
equipment breakdown or insulation breakdown.
Provide a power outlet to be used exclusively for
each unit, and Earth Leakage Circuit Breaker
(ELCB) for overcurrent protection should be
provided in the exclusive line.
(3) To prevent possible hazards from insulation failure,
the unit must be grounded.
(4) Each wiring connection must be done in accordance with
the wiring system diagram. Wrong wiring may cause the
unit to misoperate or become damaged.
(5) Do not allow wiring to touch the refrigerant tubing,
compressor, or any moving parts of the fan.
(6) Unauthorized changes in the internal wiring can be very
dangerous. The manufacturer will accept no responsibility
for any damage or misoperation that occurs as a result of
such unauthorized changes.
(7) Regulations on wire diameters differ from locality to
locality. For field wiring rules, please refer to your LOCAL
ELECTRICAL CODES before beginning.
You must ensure that installation complies with all relevant
rules and regulations.
(8) To prevent malfunction of the air conditioner caused by
electrical noise, care must be taken when wiring as follows:
●
The remote control wiring and the inter-unit control wiring
should be wired apart from the inter-unit power wiring.
●
Use shielded wires for inter-unit control wiring between
units and ground the shield on both sides.
(9) If the power supply cord of this appliance is damaged,
it must be replaced by a repair shop appointed by the
manufacturer, because special purpose tools are required.
4-2. Recommended Wire Length and Wire Diameter for Power Supply System
Outdoor unit
Indoor unit
Type
Time delay fuse or
circuit capacity
Type
Time delay fuse or
circuit capacity
U-72ME2U9
50 A
K2
15 A
U-96ME2U9
60 A
D1, U2, Y2, F2, M2, T2, P1, R1
15 A
U-120ME2U9
60 A
E1
15 A
U-144ME2U9
60 A
U-72ME2U94
25 A
U-96ME2U94
25 A
U-120ME2U94
25 A
U-144ME2U94
30 A
Control wiring
(A) Inter-unit (between outdoor and
indoor units) control wiring*
(B) Remote control wiring
(C) Control wiring for group control
AWG #18 (0.75 mm
2
)
AWG #18 (0.75 mm
2
)
AWG #18 (0.75 mm
2
)
Max. 3,280 ft. (1,000 m)
Max. 1,640 ft. (500 m)
Max. 650 ft. (200 m) Total
(D) Inter-outdoor unit control wiring
AWG #18 (0.75 mm
2
)
Max. 980 ft. (300 m)
NOTE
* With ring-type wire terminal.
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