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7. Electrical Wiring
7-1. 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.
(2)
Provide a power outlet to be used exclusively for
each unit, and a power supply disconnect and
circuit breaker 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 accor-
dance 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.
7-2. Recommended Wire Length and Wire Diameter for Power Supply System
Models
(A)
*1
Power Supply
AWG #12
XHS2432 • CH2432
69 ft.
KHS2432
AWG #10
• CH2432
THS2432
76 ft.
XHS3632
AWG #10
• CH3632
KHS3632
86 ft.
AWG #8
THS3632 • CH3632
88 ft.
*1 Refer to the Wiring System Diagrams (See below diagram) for the meaning of "A", "B".
AWG = American Wire Gauge
*2 Wires connected to terminal base shall be provided with a ring pressure terminal securely fastened in place.
NOTE
To access the electrical component box, turn off the
power supply, then open the air intake grille and
remove the electrical component box cover.
1)
Inter-Unit Control Wiring (c) has no polarity.
But for other wiring, respect polarity.
Be sure to connect as shown in the Wiring Sys-
tem Diagram.
2)
The basic connection diagram of the indoor unit
shows the 5P terminal board.
(B)
*1
Inter-unit
(C)
Wiring
Control Wiring
*2
AWG #14
*2
165 ft.
Max. 3,000 ft.
*2
AWG #10
*2
165 ft.
Max. 3,000 ft.
*2
AWG #14
*2
165 ft.
Max. 3,000 ft.
*2
AWG #8
*2
165 ft.
Max. 3,000 ft.
(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:
G The inter-unit control wiring and the wired remote
control wiring (option) should be wired apart from
the inter-unit power wiring.
G It is recommended that shielding wires or twisted
pair wires be used for the wired remote control
(option) and the inter-unit control wiring if the air
conditioner is installed where it is exposed to the
influence of electrical and/or electro-magnetic
noise.
*1
Inter-unit
Time Delay Fuse
or Circuit Capacity
AWG #18
30A
AWG #18
35A
AWG #18
35A
AWG #18
45A
THS
5P terminal board
1 2
Power
Inter-unit
supply
control wiring
36
S4179705
Power Supply Terminal Base (Outdoor Unit)
Capacity
Max. Wire Diameter
50A
50A
50A
50A
KHS, XHS
4P terminal board
U1
U2
U1 U2
1 2
Inter-unit
control wiring
1104_M_I
1105_M_I
Fig. 7-1
AWG #6
*2
AWG #6
*2
AWG #6
*2
AWG #6
*2
Power
supply
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