Electrical Connection Of Rpk Units - Hitachi RCI Service Manual

4 Electrical wiring

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 gas refrigerant pipes, printed circuit boards (PCB), sharp edges or
electrical 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
Check that the power supply for the RPIM indoor unit is 240 V. If not, replace connectors CN27 and CN28 on the TF
transformers in the electrical box.
N O T E
• To prevent the screws from falling from the terminal box, do not remove them completely, hold onto the terminal
and check that the screw is secure through the hole in the terminal.
• Use the following screws for the terminal box:
– M4 screw for the power supply.
– M3.5 screw for the operating line.
Follow the steps below depending on the type of communication to connect the remote control:
• Connection for wireless remote controls:
1 Turn the sliding changeover switch (SW1) to the wireless position.
• Wiring connection for remote controls or optional extension wire:
N O T E
In installations with double or triple combinations: if the H-LINK communication network wiring between indoor
units is incorrect, only unit 1 will start without issuing alarms during the start-up procedure.
1 Prior wiring disconnection for correct system operations:
– If the indoor unit is RPK-(2.0)FSN2M disconnect the wiring to connector CN25.
– If the indoor unit is RPK-(2.5-4.0)FSN2M disconnect the wiring to connector CN12.
2 Wiring connection for PC-ART remote control:
– Connect the remote control cable to terminals A and B of the terminal strip (TB2).
– Tighten the screw on terminals A and B.
– Check that the cables are correctly secured.
– Turn the sliding changeover switch (SW1) to the wiring position.
Follow the steps below to connect the power cables to the terminal strip (TB1):
1 Where necessary, loosen the screws on terminals L1 and N on the terminal strip (TB1)
2 Connect the power cables to terminals L1 and N.
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SMGB0063 rev. 1 - 10/2010