Hitachi RCD-2.5FSN2, Service Manual

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4 Electrical wiring
145
4
SMGB0077 rev.0 - 01/2013
4.1.8 Electrical connection of RPK units
Work prior to the electrical connection
1 Turn off the power supply switches before starting work and fit the appropriate locks and safety warnings.
2 Wait 5 minutes after turning off the power supply switches.
3 Check that the fans on the indoor and outdoor units are at a standstill before starting work.
N O T E
• The electrical power for the unit must involve a specific power line, with an exclusive power control switch and
residual current breaker, installed in line with local or national safety regulations.
•
Check that the electrical power line has enough capacity to supply the unit. Its length, the cable diameter and
their protection (sleeve or jacket) must be appropriate for the unit.
• For further information, always consider the current regulations in the country where the unit is to be installed.
C A U T I O N
• Risk of fire: cables must never touch the refrigerant pipes, printed circuit boards (PCB), sharp edges or elec -
trical components inside the unit to avoid damaging them.
• Loose connection terminals may lead to cable and terminal overheating. The unit may operate incorrectly,
leading to a risk of fire. Check that the cables are firmly secured to the connection terminals.
Electrical connection
C A U T I O N
• 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 given in “Techni-
cal Catalog”. Make sure that the components comply with National Electrical Code (NEC).
• Use the shielded twist pair cable for the control cable between the outdoor unit and the indoor unit, the control
cable between indoor units and the remote control switch cable of PC-ARF.
• Check to ensure that the power supply voltage is 230V.
• Check the capacity of the electrical wires. If the power source capacity is too low, the system cannot be started
due to the voltage drop.
• Check to ensure that the earth wire is connected.
The electrical wiring capacity of the outdoor unit should be referred according to “Installation & Operation Manual” of the
outdoor unit. Setting dip switch may be required depending on the combination with the outdoor unit.
1 Connect the power source cables (L1 and L2 (N) phases) to the terminal board correctly.
RPK-(0.8-1.5)FSN(H)3M RPK-(2.0-4.0)FSN3M
A B 1 2
L1
(Mp)
N
TB2
TB1
Control
line Operating
line
Power source line
A B 1 2
L1 L2
TB2
TB1
Control
line Operating
line
Power source line