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6.Electrical Wiring
Turn OFF the main power switch to the indoor unit and the outdoor unit and wait for more than 10 minutes before
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electrical wiring or a periodical check is performed.
Check to ensure that the indoor fan and the outdoor fan have stopped before electrical wiring work or a periodical
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check is performed.
Protect the wires, electrical parts, etc. from rats or other small animals. If not, rats may gnaw at unprotected parts,
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which may lead to a fire.
Avoid the wirings from touching the refrigerant pipes, plate edges and electrical parts inside the unit. If not, the
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wires will be damaged and at the worst, a fire will break out.
Use a medium sensing speed type ELB (Earth Leakage Breaker, activation speed of 0.1 sec. or less). If not, it will
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cause an electric shock or a fire.
Fix the cables securely. External forces on the terminals could lead to a fire.
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It is forbidden to use the terminal block of air conditioner power supply to extend power line to other indoor units .
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Use the power distribution box to extend the power supply wiring on the inner side of the air conditioner. Pay
attention to the wiring capacity calculation, otherwise, the wiring capacity is too small and a fire may break out.
Tighten screws with the following torque.
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M4：0.7 to 1.0 ft·lbs(1.0～1.3 N·m)
M5：1.5 to 1.8 ft·lbs(2.0～2.4 N·m)
M6：3.0 to 3.7 ft·lbs(4.0～5.0 N·m)
M8：6.6 to 8.1 ft·lbs(9.0～11.0 N·m)
M10：13.3 to 17 ft·lbs(18.0～23.0 N·m)
6.1 General Check
(1)Make sure that the field-selected electrical components (main power switches, fuse, wires, conduit
connectors and wire terminals) comply with National Electrical Code (NEC).
Supply electrical power to each outdoor unit. An ELB, fuse and main switch should be used for each
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outdoor unit. Otherwise, it may lead to an electric shock, or a fire may break out
The power supply for the indoor unit and outdoor unit should be provided separately.
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Connect a power supply wiring to each indoor unit to be connected to the same outdoor unit.
(2)
Check to ensure that the power supply voltage is within ±10% of the rated voltage.
(2)
If the power supply voltage is excessively low, the system does not start due to the voltage drop.
(3)
Check the size of the electrical wires.
(3)
(4)
In some cases, the air conditioner may not operate properly under the following cases.
(4)
In case that the air conditioner has to share power transformer with device of high electricity consumption*
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In case that the power source wires for the device* and the air conditioner are adjacent to each other.
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* lift, container crane, rectifier for electric railway, inverter power device, arc furnace, electric furnace, large-
sized induction motor and large-sized switch.
For the cases mentioned above, induction surge of the power supply wiring for the air conditioner may occur due
to a rapid change in electricity consumption of the device and an activation of switch. Therefore check the local
regulations and standards before performing electrical work in order to protect the power supply wiring of the air
conditioner.
(5)Check to ensure that the earth wire of the outdoor unit is connected.
WARNING
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