General Notes; General Check; Led's Indication - Hitachi UTOPIA RAS-4HVRP2E Service Manual

4 Electrical and control settings

General notes

4.1 General notes
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D A N G E R
• Do not connect of adjust any wiring or connections unless the main power switch is OFF.
• Use an earth leakage breaker with medium sensitivity, and an activation speed of 0.1 sec or less. If this is not fitted, there is
a risk of electric shock and/or fire.
• Install an earth leakage breaker, fuse and circuit breaker for each outdoor unit power line. Not fitting it may cause an electric
shock or fire.
• Never connect the earth cable to the refrigerant pipes. Fire can may occur.
• Do not connect the earth cable to the lighting arrest system. The electrical potential of earth would increase abnormally.
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C A U T I O N
• Before any electrical wiring work or regular inspections, switch off the main power supply switches of the indoor and outdoor units.
Wait three minutes before starting installation or maintenance work.
• Make sure that the indoor and outdoor are completely stopped before starting work on the electrical wiring or regular inspections.
• Protect cables, drain hose, electric parts, etc. from rodents and insects; otherwise these might damage unprotected components and,
in the worst case, cause a fire.
• Wrap the accessory packing around the wires, and plug the wiring connection hole with the seal material to protect the product from
any condensed water and insects.
• Do not allow cables to come into contact with the refrigerant pipes, metal edges, printed circuit boards (PCB) or the electric parts inside
the unit; the cables may be damaged and, in the worst case, cause a fire.
• Tightly secure the wires with the cord clamp inside the indoor unit.
• Lead the wires through the knockout hole in the side cover when using conduit.
• Secure the cable of the remote control switch with the cord clamp inside the electrical box.
• Electrical wiring must comply with national and local codes. Contact your local authority in regards to standards, rules, regulations, etc.
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N O T E
• Use twist pair wire (more than 0.75 mm²) for operation wiring between outdoor unit and indoor unit, and operation wiring between
indoor unit and indoor unit.(Do not use wire with more than 3 cores).
• H-LINK twist pair shielded cable must be grounded in the outdoor unit side.
• Use shielded wires for intermediate wiring to protect the units from noise obstacle at length of less than 300 m and size complied with
local code.

4.1.1 General check

1 Ensure that the field-supplied electrical components (mains power switches, circuit breakers, wires, connectors and
wire terminals) have been properly selected according to the electrical data indicated. Make sure that they comply
with national and regional electrical codes.
2 Check to ensure that the power supply voltage is within +/-10% of the rated voltage.
3 Check to ensure that power supply has an impedance low enough to warranty not reduce the starting voltage more
than 85% of the rated voltage.
4 Check to ensure that the ground wire is connected.
5 Ensure that fuse or circuit breaker are of specified capacity.

4.1.2 LED's indication

LED1 Green
LED2 Red
LED3 Red
LED4 Yellow
LED5 Green
LED6 Yellow
LED7 Yellow
68 SMGB0136 rev.0 - 07/2021
LED Indication
Power Indication
Power Indication
Heat pump operation (thermo ON/OFF)
Alarm (flickering with 1 sec interval)
Not used
H-LINK transmission
H-LINK RCS transmission