5.2 Electrical Wiring Connection
Connect the electrical wiring according to the following figures:
TB : Terminal Block
PCB : Printed Circuit Board
: Power Supply Wiring
: Communication Cable
Outdoor Unit
Switch
Switch
Cable Box
Cable Box
No. 0
Indoor Unit
No. 1
Indoor Unit
Wired
Controller
Wired
Controller
Communication Cable for
Wired Controller
Communication
Wired Controller
Cable for
3N
380-415V
50Hz
220-240V
50Hz
30
5.1 General Check
(1) Make sure that the field-supplied electrical components (main power switches, circuit breakers, wires,
conduit connectors and wire terminals) have been properly selected according to the electrical characteristics
indicated in the table 5.1. Make sure that the components comply with the local national standards and rules.
◆
Supply electrical power to each outdoor unit. An ELB (Earth Leakage Breaker), fuse and main switch
should be used for each outdoor unit. If not, it will be cause of fire or electrical shock.
(2) Ensure that the power supply voltage is within ±10% of the rated voltage. If the power supply voltage is
too low, the system cannot start due to the voltage drop.
(3) Check the size of the electrical wires.
(4) Ensure that the ground wiring for the outdoor unit and indoor unit are connected. If not, it will cause a
fire or an electrical shock.
(5) Communication cabling shall be a minimum of 0.75mm
2
, 2-Conductor, Stranded Copper. Shielded
cable must be considered for applications and routing in areas of high EMI and other sources of potentially
excessive electrical noise to reduce the potential for communication errors. When shielded cabling is applied,
proper bonding and termination of the cable shield is required as per guidelines. Plenum and riser ratings for
transmission cables must be considered per application and local code requirements.
◆
In case of where the power source for the air conditioning is supplied from the same power
transformer as the device with high electricity consumption*.
◆
In case of where the power supply wiring for the device* and for the air conditioning are located close
to each other.
* Example: Lift, container crane, rectifier for electric railway, inverter power device, arc furnace, electric
furnace, large-sized induction motor, and large-sized switch.
In the instances mentioned above, an induction surge of the power supply wiring for the air conditioning
could occur due to a rapid change in electricity consumption of the device and activation of the switch. Therefore,
check the field regulations and standards before performing electrical work in order to protect the power supply
wiring for the air conditioning.
