Electrical Connection Of Rcim Units - Hitachi RCI Service Manual

4 Electrical wiring

4.1.3 Electrical connection of RCIM 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 RCIM indoor unit is 240 V. If
not, replace connectors CN27 and CN28 of the TF transformers in
the electrical box.
Make the connection between the indoor unit and the air panel.
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 to connect the remote control cable or the optional extension wire:
1 Pass the cable through the knockout hole in the cabinet.
2 Connect the cable to terminals A and B of the terminal strip (TB1).
3 Tighten the screw on terminals A and B.
4 Check that the cables are correctly secured.
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SMGB0063 rev. 1 - 10/2010