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Cross-Sectional (A)+(B) (A) Power Supply Wiring Length (ft) (C) Control
Fuse or Circuit
Area (AWG)
(B) Power Line Length (ft) Line Length (ft)
Model (#14) (#12) (#14)
Breaker Capacity
CU-KS12NK1A 131 (Max.) 230 (Max.) 65 (Max.) 20A
CU-KS18NKU, CU-KS18NKUA 131 (Max.) 230 (Max.) 100 (Max.) 15A
# ... AWG (American Wire Gauge)
Table 4
Be sure to comply with local codes on running the
wire from the indoor unit to the outdoor unit (size
of wire and wiring method, etc.).
Each wire must be firmly connected.
No wire should be allowed to touch refrigerant
tubing, the compressor, or any moving part.
Be sure to connect the power supply line to the
outdoor unit as shown in the wiring diagram. The
indoor unit draws its power from the outdoor unit.
Do not run wiring for antenna, signal, or power
lines of television, radio, stereo, telephone, secu-
rity system, or intercom any closer than 3'3" (1 m)
from the power cable and wires between the
indoor and outdoor units. Electrical noise may
affect the operation.
To avoid the risk of electric shock, each air
conditioner unit must be grounded.
For the installation of a grounding device,
please observe local electrical codes.
Grounding is necessary, especially for units
using inverter circuits, in order to release
charged electricity and electrical noise caused
by high tension.
Otherwise, electrical shock may occur.
Place a dedicated ground more than 7' (2 m)
away from other grounds and do not have it
shared with other electric appliances.
*
A disconnect switch may be required by
national or local codes.
NOTE
WARNING
WARNING
CAUTION
Always comply with national and local code
requirements.
CAUTION
Fig. 7a
(CU-KS12NK1A)
Disconnect
switch
*
1
2
3
1
2
3
4
5
6
Grounding line
115V
115V
115V
INDOOR
UNIT
OUTDOOR
UNIT
Field supply
Grounding
line
L
N
Power supply
Single phase 115V 60HZ
Terminal Terminal
(A)
(B)
(C)
(B)
Fig. 7b
(CU-KS18NKU, CU-KS18NKUA)
Disconnect
switch
*
1
2
3
1
2
3
4
5
6
Grounding line
230/208V
230/208V
230/208V
INDOOR
UNIT
OUTDOOR
UNIT
Field supply
Grounding
line
L
1
L
2
Power supply
Single phase 230/208V 60HZ
Terminal Terminal
(A)
(B)
(C)
(B)
WIRING SYSTEM DIAGRAM