Wiring - Hitachi Primairy Series Installation & Maintenance Manual

INSTALLATION INSTRUCTIONS
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Wiring

• Turn OFF the main power switch of the indoor unit and the outdoor unit and wait for more than 3 minutes before electrical wiring
work or a periodical check is performed.
• Check to ensure that the indoor fan and the outdoor fan have stopped before electrical wiring work or a periodical check is
performed.
• Protect the wires, electrical parts, etc. from rats or other small animals. If not protected, rats may gnaw at unprotected parts and
at the worst, a fire will occur.
• Avoid the wiring from touching the refrigerant pipes, plate edges and electrical parts inside the unit. If not do, the wires will be
damaged and at the worst, a fire will occur.
• Install an ELB (Electric Leakage Breaker) in the power source. If ELB is not used, it will cause electric shock or fire at the worst.
• This unit uses an inverter, which means that it must be used an earth leak detector capable of handing harmonics in order to
prevent malfunctioning of the earth leak detector itself.
• Do not use intermediate connection wires, stranded wires (see <Attentions when Connecting the Power Supply wiring>),
extension cables or control line connection, because the use of these wires may cause abnormal heat, electric shock or fire.
• The tightening torque of each screw is shown as follows.
M4: 1.0 to 1.3 Nm
M5: 2.0 to 2.5 Nm
M6: 4.0 to 5.0 Nm
M8: 9.0 to 11.0 Nm
M10: 18.0 to 23.0 Nm
Keep the above tightening torque during wiring work.
• Use tape material to wrap the wire and seal wiring holes to prevent the condensed water and insects.
• Tightly secure the power source wiring by using the cord clamp inside the unit.
NOTE: Fix the rubber bushes with adhesive when conduit tubes to the outdoor unit are not used.
General Check
1. Make sure that the field-selected electrical components (main power switches, circuit breakers, wires, conduit connectors and
wire terminals) have been properly selected according to the electrical data.
Make sure that the components comply with National Electrical Code (NEC).
2. Check to ensure that the voltage of power supply is within 10% of nominal voltage and earth phase is contained in the power
supply wires. If not, electrical parts will be damaged.
3. Check to ensure that the capacity of power supply is enough. If not, the compressor will not be able to operate because of
abnormal voltage drop at starting.
4. Check to ensure that the earth wire is connected.
5. Install a main switch, multi-pole main switch with a space of 3.5mm or more, single phase main switch with a space of 3.0mm or
more between phases.
6. Check to ensure that the electrical resistance is more than 2MΩ, by measuring the resistance between ground and the terminal
of the electrical parts. If not, do not operate the system until the electrical leakage is found and repaired.
16 HO2019292HA
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CAUTION