Service manual
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6 ELECTRIC WIRING WORK
6�1 Wiring Principle
6.1.1 Itemized Description of Cautions.
The electrical installation must be done by professional electricians.
The electrical installation must be done in accordance with applicable technical codes and other rules.
WARNING!
Please make sure to install earth leakage circuit breaker. Earth leakage circuit breaker must be installed to prevent
electric shock or re.
CAUTIONS!
The air conditioner must be securely earthed. Incorrect earthing may cause electric shock or re.
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All the electric installations must be carried out by specialist technicians in accordance with the local laws, rules
and these instructions.
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The indoor unit and outdoor unit shall use different power supplies. The indoor units under the same system must
be powered by a unied power source. All the indoor units can only be controlled by one master power switch. Rated
supply voltage and special circuit for air conditioner must be used.
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The earthing shall be secure. The earthing wire shall be connected to the special earthing device on the
construction. The installation must be done by specialist technicians. Never connect the earth lead to the gas pipe, water
pipe, lightening rod or telephone earth wire.
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To avoid electric shock or any accident due to mal-operation, the air switch and shock-resistant earth leakage
circuit breaker that can cut off the power supply of the complete system must be installed. The air switch shall have both
the magnetic tripping and thermal tripping functions to ensure protection against the short circuit and overload. Electric
shock or fire might be caused if no installation of earth leakage circuit breaker. Do not switch on the power before
completion of the electrical work. Make sure to cut off the power supply before repair.
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Under no condition could use the capacitor to improve the power factor.
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Please use cable conduit for power cords.
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Do not lay the electronic control cables (remote control and signal line) outside the machine with other cables;
otherwise the machine might become malfunctioned or failed due to electrical noise.
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The power cord must be always connected to the power cord terminal board, and xed by using the lock connector
included with the machine. Meanwhile, prevent them from contacting the tting pipe. The diameter of power cords shall be
large enough. See below for the detailed specications. The damaged power cords and connection lines must be replaced
with the designated cables. When connecting the cable, please conrm that all the electrical components inside the electric
box shall have no coupling or terminal loosened. (Improper installation of electric box cover may lead to potential water
leakage, which will cause the unit abnormal or short circuit).
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Earth lead must be connected before connecting the power cord. An earth lead longer than the power cord shall be
provided.
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For site wiring, please refer to the circuit diagram attached on the machine body.
6.1.2 Earthing Requirements
1) The air conditioner is classied into the Class I appliances, so its earthing must be reliable.
2) The yellow-green line of the air conditioner is the earth line and can not be used for other purpose, cut off or xed
by the self-tapping screw; otherwise it would cause the hazard of electric shock.
3) The reliable earth terminal should be provided and the earth wire can not be connected to any of the following
places.
①
Running water pipe;
②
Coal gas pipe;
③
Sewage pipe;
④
Other places where the professional personnel think unreliable
6�2 Electric Wiring Design
Caution: The power of every indoor unit should be connected in outdoor unit.
a. Open surface panel.
b. Remove the electrical box cover.
c. Route the power connection cord from the back of the indoor unit and pull it toward the front through the wiring
hole upward.
d. Connect the wiring (communication) through the piping hole of the chassis and the bottom of the appliance
upward, then connect the brown wire to the Terminal board “3”;black wire(the communication wire) to the Terminal
board“2”;blue wire to the Terminal board“N(1)”,and connect the earthing wire to the screw terminal on the electric box.
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