Hitachi RAS-10FSXN1E Bedienungsanleitung Seite 38

ELECTRIC WIRING
10.2 GENERAL VERIFICATIONS
1 Make sure the electric components supplied by the fitter
(main power switches, circuit breakers, wires, connectors
and connection terminals) have been selected correctly in
line with the electrical data given.
a. The electricity supply to the unit should be via an
exclusive power control switch and protective circuit
breaker, certified and installed in accordance with local or
national safety regulations.
b. Connect the power supply wiring for each group of indoor
units to its outdoor unit group (maximum capacity for
each group of indoor units: 26 HP). Do not mix units of
different groups.
c. For heat recovery systems, the CH unit and the indoor
unit of the same refrigerant cycle can be supplied from
the same mains power switch.
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 Sometimes, the refrigeration/heating system is not able to
operate correctly in the following cases:
10.3 CONNECTION OF THE POWER SUPPLY CIRCUITS
10.3.1 Power source wiring
Supply the power sources to each outdoor unit and indoor unit group respectively. Power source wiring is fundamentally according
to this method (as example).
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Heat pump system
Outdoor
unit C
28 PMML0392B rev.1 - 07/2016
Outdoor unit power source
3N~ 400V 50Hz
Outdoor Outdoor
unit B unit A
• When the system is supplied from the same supply line as
other major consumers (heavy machinery, power inverter
systems, cranes, welding machinery, etc).
• When the supply cables of the major consumers and the
refrigeration/heating system are very close together.In these
cases, induction in the wiring to the refrigeration/heating
system may arise due to a rapid change in the electricity
consumption of the above consumers and their start-up.
Therefore before starting installation work, check the
regulations and standards concerning adequate protection of
the power supply line.
?
N O T E
For further information, please refer to the applicable legislation in the
country in which the unit is to be fitted.
4 During the preliminary preparation work of the electricity
supply line for the unit, the provisions in local and national
legislation must never be violated.
5 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 fire.
• Do not connect the earth cable to the lighting rod. The electrical
potential of earth would increase abnormally.
Indoor unit side
Indoor
unit
Indoor unit
power source
1~ 230V 50Hz
Indoor
unit