Hitachi AIR CORE 700 PPIM-B18UFA1DQ Manuel D'utilisation, D'installation Et D'entretien page 26

7. Electrical Wiring
Take care not to pinch electrical wirings when attaching the service cover. It may cause an electrical
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shock or fire.
The ground wire must be longer than the current-carrying conductor when installing the power cord.
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Using the air conditioner power terminal to transfer the power cord is strictly prohibited. A power
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distribution box can be used to expand the power distribution on the indoor unit.
A switch that can ensure all-pole disconnection should be installed between the power supply and air
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conditioning unit, and the contact spacing of this switch should be no less than 0.118inch (3mm).
NOTICE
The procedure of the wiring work shall be performed according to this manual and "Installation &
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Maintenance Manual" of the outdoor unit.
The control cable (Field-Supplied) between the indoor unit and the outdoor unit does not have any
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polarity. Do not apply an excessively high voltage to the cable (Rated Voltage 5V). It may cause failure.
The wired remote controller cable (Field-Supplied) does not have any polarity. Do not apply an
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excessively high voltage to the cable (Rated Voltage 15V). It may cause failure.
Maintain the rated voltage for the power source. It may be harmful to the unit if the voltage is either too
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high or too low.
Take enough capacity for the power source. If not, the operation cannot be started due to the wide
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voltage reduction.
7.1 General Check
1. Ensure that the electrical equipment used in the installation site (main power switch, circuit breakers,
wires, conduit connectors and wires terminals) have been properly selected in accordance with local
laws and regulations.
2. Use the shielded twist pair cable for the control cable between the outdoor unit and the indoor unit,
the control cable between indoor units and the wired remote controller.
3. Check to ensure that the power supply voltage is within ±10% of the rated voltage.
4. Check the capacity of the electrical wires. If the power source capacity is too low, the system cannot
be started due to the voltage drop.
5. Check to ensure that the earth wire is connected.
7.2 Field Minimum Wire Sizes for Power Source
Use an ELB (Earth Leakage Breaker). If it is not used, it will cause an electric shock or a fire.
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Do not operate the system until all the check points have been cleared.
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(a) Check to ensure that the electrical resistance is more than 1 megohm, by measuring the resistance
between ground and the terminal of the electrical parts. If the electrical resistance is less than 1
megohm, do not operate the system until the electrical leakage is found and repaired.
(b) Check to ensure that the stop valves of the outdoor unit are fully opened, and then start the system.
Electrical parameters and cable specification of indoor unit
Model
PPIM-B18UFA1DQ
PPIM-B24UFA1DQ
PPIM-B30UFA1DQ
PPIM-B36UFA1DQ
PPIM-B48UFA1DQ
Maximum
Power Supply
Current (A)
1.32
1.56
208/230V/1Ph/60Hz 1.83
2.43
2.67
-14-
Power Cord Transmission Cable
Specifications Specification
2.5mm 0.75mm
2 2