P01432Q-rev.1
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8. Electrical Wiring
8.1 General Check
(1) Make sure that the field-selected electrical components: (main power switches, circuit breakers, wires,
conduit connectors, and wire terminals) have been properly labeled in accordance with electrical data
as specified in the Engineering Manual. Make sure that the components comply with the National
Electrical Code (NEC).
(2) Check to ensure that the power supply voltage is within ±10% of the rated voltage.
(3) Check the capacity of the electrical wires.
If the power supply capacity is too low, the system cannot be started due to a voltage drop.
(4) Verify that the ground wiring is securely connected.
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All electrical work must be done as outlined in this manual and in accordance with this manual.
Substandard work can result in fire and damage to the unit.
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Use specified cables between units and choose the cables correctly. If not, an electrical shock or
fire may occur.
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Do not open the service cover or access panel for the indoor or outdoor units without turning OFF
the main power supply. It can result in an electrical shock.
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Turn OFF the main power switch of the indoor unit and the outdoor unit before attempting any electrical
wiring work or a periodical check is performed. If not, it will result in an electric shock or a fire.
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Check to ensure that the indoor fan and the outdoor fan have stopped before attempting any
electrical wiring work or for any scheduled electrical work that is being performed.
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Tighten screws according to the following torque.
M3.5: 0.9 ft·lbs (1.2 N·m)
M5: 1.5 to 1.8 ft·lbs (2.0 to 2.4 N·m)
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Secure all cables together with cable bands and seal the connecting hole against moisture and
insects.
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Run the electrical wiring through the connecting hole in the side cover when using conduit.
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Secure the wired controller cable using the cable band inside the electrical box.
