Hitachi RAS-10FSXNPE, Instruction Manual

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3 Sometimes, the refrigeration/heating system is not able to
operate correctly in the following cases:
• 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.
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).

Heat pump system
1
2
1
2
1
2
1
3
4 4 4
4
7 7
6 6
6
6
7
9 9
8 8
8
5
5
5 5
S
CB
ELB
2
8
9
3 3 3
Outdoor unit power source
3N~400V 50 Hz
Indoor unit power source
1N~230V 50 Hz
Outdoor
unit C
Indoor unit side
ELB
ELB (Earth leakage breaker)
Power source wiring (OU)
Power source wiring (IU)
Earth wiring (OU)
Earth wiring (IU)
Transmission wiring (OU ~IU)
Transmission wiring (OU ~OU) ELB
ELB
CB
CB (Circuit breaker)
CB
CB
S
S (Main switch)
S
S
Outdoor
unit B
Outdoor
unit A
Indoor
unit
Indoor
unit
ENGLISH
ELECTRIC WIRING
PMML0479 rev.4 - 11/2018 37