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6.
Electrical Wiring
● LOCK ALL ELECTRICAL POWER SUPPLY SWITCHES IN THE OFF POSITION BEFORE INSTALLING
THE UNIT. FAILURE TO DISCONNECT POWER SUPPLY MAY RESULT IN ELECTRICAL SHOCK OR
EVEN DEATH.
● Turn off the main power switch to the CH-Box, the indoor unit and the outdoor unit before electrical
wiring work or a periodical check is performed.
● Insulate electrical wiring, condensate piping, and electrical components from threats posed by
burrowing animals and temperature extremes. Failure to do so can over time, deteriorate system
performance.
● Secure the cables. External forces on the terminals could lead to a fire.
● Be sure to attach the cover so that it fits securely on the electrical box without any gaps.
Secure the cover with screws.
● Tighten screws according to the following torque.
M4: 1.0 to 1.3 N . m (0.7 to 1.0 ft . lbs) (TB1, TB2, TB3, TB4)
● Wrap the field-supplied insulation around the wires, and plug the wiring connection hole with the
seal material to protect the product from any condensate water or insects.
● Tightly secure the wires with the cable clamp inside the CH-Box.
● Do not connect the ground wiring to the gas pipe, condensate pipe or lightening conductor.
Gas pipe: An explosion and ignition may occur when gas leaks.
Water pipe: There is no effect of ground wiring when a hard vinyl pipe is used.
Lightning conductor: The ground electric potential abnormally increases when a lightning
6.1 General Check
(1) Make sure that the field-selected electrical components (main switches, fuses, ELB (Earth Leakage
Breaker), wires, conduit connectors and wire terminals) are properly selected according to the
electrical data indicated in Table 6.1. Make sure that the components comply with National Electrical
Code (NEC).
(2) Communication cable must 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.
(3) Use shielded communication cable for communication cable between the indoor and the outdoor unit
(Max. 1,000m (3,281 ft)), and connect the shielded part to the ground screw in the electrical box.
(4) Make sure that the power supply voltage is within ±10% of the rated voltage.
(5) Check the capacity of the electrical wiring. If the power supply capacity is too low, the system cannot
be started due to the voltage drop.
(6) Make sure that the ground wiring is connected.
20
conductor is used.
P5417025-rev.1
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