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7. Electrical Wiring
WARNING
!
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Before performing wiring connection or regular check, turn off the main power supply of the
indoor and outdoor units. Wait for at least ten minutes after shutting off the power supply.
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Before performing wiring connection or regular inspection, ensure that the indoor and outdoor
fan is stopped.
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Protect wires, electrical components and so on in order to prevent mice or other small animals
from destroying them. If not protected, the mouse may bite the unprotected components, which
may cause fire.
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Avoid the wiring from touching the refrigerant pipes, sheet metal edges, and the electrical
components inside the unit. This can damage the wires and can also cause fire.
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Use a medium-speed induction ELB (earth leakage circuit breaker, action time 0. 1 second or
less). If not, it will cause electric shocks or fire.
●
Fix the wires firmly, this may lead to fire incidents if the terminals is forced by outside.
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Do not use the air conditioner power supply terminal block to connect the power cord. Use the
power distribution box inside the unit to extend the power supply wiring. Take care of the wiring
capacity calculation. It may easily lead to fire, if the wiring capacity is too small.
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Fasten the screws according to the following torque:
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M4:1.0~1.3 N • m
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M5:2.0~2.4 N • m
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M6:4.0~5.0 N • m
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M8:9.0~11.0 N • m
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M10:18.0~23.0 N • m
7.1 General Check
(1) Ensure that the electrical components (main power, circuit breakers, wires, electrical conduit
connections and terminals) used in the installation site are selected as per the requirements
specified in technical manual. The specifications are compliant with national electrical code.
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Power on each outdoor unit. Each outdoor unit should use earth leakage circuit breakers, circuit
breakers and main switches. Otherwise, may cause a fire or electric shock.
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Indoor unit and outdoor unit should be powered separately.
For each indoor unit (connected to the same outdoor unit) connect a power wire.
(2) Check that the power supply voltage is within ±10% of the rated voltage. If the power supply voltage
is too low, the system fails to start due to voltage drop.
(3) Check the wire specifications.
(4)
The air conditioner may not work due to the following reasons in some scenarios:
●
Air conditioner and some high power consuming equipment are powered by the same transformer*.
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The equipment* and air conditioner lines are too close to each other.
● *(For example) elevators, container cranes, electric rectifiers, inverters, electric arc furnaces,
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electric furnaces and large induction motor and a large switch. In the cases mentioned above,
●
due to the rapid changes in power consumption and switching devices, air conditioning power
induction surge occurs. Therefore, to protect the air conditioner's power wires, electric pre-job
inspection must be performed at the installation site specifications and standards.
(5) Check that the grounding wire is connected for both, outdoor and indoor unit.
