Hitachi RAS-5FSNY2E [128/148] General verifications

10 Electrical wiring

120

TCGB0068 rev.1 - 08/2012

10.1 General information

10.1.1 General notes

C A U T I O N

• Before any electrical wiring work or regular inspections, switch off the main power supply switches of the in-

door and outdoor units. Wait three minutes before starting installation or maintenance work.

• Make sure that the indoor and outdoor fans are completely stopped before starting work on the electrical wi-

ring or regular inspections.

• Protect cables, drain hose, electric parts, etc. from rodents and insects; otherwise these might damage unpro-

tected components and, in the worst case, cause a re.

• 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 re.

• Firmly secure the cables inside the indoor unit with plastic anges.

• In the case that a conduit tube for eld-wiring is not used, x rubber bushes with adhesive on the panel.

D A N G E R

• Use an earth leakage breaker with medium sensitivity, and an activation speed of 0.1 sec or less. If this is not

tted, there is a risk of electric shock and/or re.

• Install an earth leakage breaker, fuse and circuit breaker for each outdoor unit power line. Not tting it may

cause an electric shock or re.

10.1.2 General verications

1 Make sure the electric components supplied by the installer (main power switches, circuit breakers, wires, connectors

and connection terminals) have been selected correctly in line with the electrical data given.

a. The electricity supplied to the unit should be via an exclusive power control switch and protective circuit breaker,

certied and installed in accordance with local or national safety regulations.

b. The electricity supplied for the outdoor and indoor units should be separated. Connect the voltage supply wiring for

each group of indoor units to the same outdoor unit

2 Check that the supply voltage is between 90 and 110% of the rated voltage. Where the voltage capacity is too low, it

will not be possible to start the system due to the drop in voltage.

3 During the preliminary preparation work of the electricity supply line for the unit, the provisions in local and national

legislation must never be violated.

4 Check that the earth cable is correctly connected.

D A N G E R

• Never connect the earth cable to the refrigerant pipes. The gas in the pipes could cause a re.

• Do not connect the earth cable to the lighting arrest system. The electrical potential of earth would increase

abnormally.