Hitachi PC-ARFG2-Z Installation & Maintenance Manual page 6

1. Safety Summary
Electrical Precautions
WARNING
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Only use electrical protection equipment and tools suited for this installation.
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Insulate the wired remote controller against moisture and temperature extremes.
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Use specified cables between units and the controller.
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If the power cord is damaged, it must be replaced immediately by a suitably qualified tradesperson.
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Communication cabling must be a minimum of 18-Gauge, twin core stranded copper cable.
Shielded cable must be considered for applications 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 Johnson Controls-Hitachi
Air Conditioning guidelines. Plenum and riser ratings for communication cables must be considered per
application and local code requirements.
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The polarity of the input terminals is important, so be sure to match the polarity when using contacts that
have polarity.
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Highly dangerous electrical voltages may be used in this system. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and inadequate grounding can cause serious injury or death.
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Before installing the controller or remote devices, ensure that the system has been turned off, and after five
minutes, power supply to the entire system has been isolated. This is to ensure that the system has undergone
and completed its proper shut-down process.
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Do not open the service cover or access panel to the indoor or outdoor units without turning OFF the main
power supply. Before connecting or servicing the controller or cables to indoor or outdoor units, open and tag
all disconnect switches. Never assume electrical power is disconnected. Verify with a meter and equipment.
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Clamp electrical wires securely with a cable ties after all wiring has been completed. In addition, run wires
securely through the wiring access channel.
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Secure the suspended cables at regular intervals, but not too tightly.
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Make sure that the terminals do not come into contact with the surface of the electrical box.
If the terminals are too close to the surface, it may lead to failures at the terminal connection.
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Avoid moisture ingress on to and in to the controller as it could cause electric shock and/or damage the unit.
Do not use strong detergent such as a solvent. Clean with a soft cloth.
A16381H9HF
Take the following precautions to reduce the risk of electric shock, fire or
explosion resulting in serious injury or death:
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