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P5416904
Installation Precautions
Take the following precautions to reduce the risk of electric shock, fire or
explosion resulting in serious injury or death:
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If the remote sensors are not used with this controller, then do not install this controller…
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In a room where there is no thermostat.
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Where the unit is exposed to direct sunshine or direct light.
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Where the unit will be in close proximity to a heat source.
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Where hot/cold air from the outdoors, or a draft from elsewhere (such as air vents, diffusers or grilles) can
affect air circulation.
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In areas with poor air circulation and ventilation.
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Perform a test run using the controller to ensure normal operation. Safety guards, shields, barriers, covers,
and protective devices must be in place while the compressor/unit is operating.
During the test run, keep fingers and clothing away from any moving parts.
After installation work for the system has been completed, explain the “Safety Precautions,” use, and maintenance
of the unit to the customer according to the information in all manuals that accompanied the system. All manuals and
warranty information must be given to the user or left near the Indoor Unit.
Electrical Precautions
Take the following precautions to reduce the risk of electric shock, fire or
explosion resulting in serious injury or death:
●
Only use electrical protection equipment and tools suited for this installation.
● Insulate the wired zone controller against moisture and temperature extremes.
● Use specified cables between units and the controller.
● This equipment can be installed with a Ground Fault Circuit Breaker (GFCI), which is a recognized measure for
added protection to a properly grounded unit. Install appropriate sized breakers / fuses / overcurrent protection
switches, and wiring in accordance with local, state and NEC codes and requirements. The equipment installer is
responsible for understanding and abiding by applicable codes and requirements.
● Communication cabling shall be a minimum of 18-Gauge, 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 HITACHI guidelines. Plenum and riser ratings for communication
cables must be considered per application and local code requirements.
● The polarity of the input terminals is important, so be sure to match the polarity when using contacts that have
polarity.
● 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.
● Before installing the controller or remote devices, ensure that the indoor and outdoor unit operation has been
stopped. Further, be sure to wait at least five minutes before turning off the main power switch to the indoor or
outdoor units. Otherwise, water leakage or electrical breakdown may result.
● 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. Check with a meter and equipment.
● Use an exclusive power supply at the controller’s rated voltage.
● Be sure to install circuit breakers (ground fault interrupter, isolating switch, molded case circuit breaker, and so
forth) with the specified capacity. Ensure that the wiring terminals are tightened securely to recommended torque
specifications.
● Clamp electrical wires securely with a cord clamp after all wiring is connected to the terminal block. In addition, run
wires securely through the wiring access channel.
● When installing the power lines, do not apply tension to the cables. 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.
● Do not clean with, or pour water into, 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.
● Check that the ground wire is securely connected. Do not connect ground wiring to gas piping, water piping,
lighting conductor, or telephone ground wiring.
