Electrical Connection Of Kpi Units - Hitachi RCI Service Manual

4 Electrical wiring

4.1.10 Electrical connection of KPI 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
Cut the centre of the rubber bushing in the wiring connection
knockout hole.
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 the terminals on the printed circuit board
(PCB) located inside the electrical box.
3 Tighten the screw on terminals A and B in the electrical box.
4 Check that the cables are correctly secured.
C A U T I O N
If the power cables are to be connected in series, check that the current is below 50 A.
Follow the steps below to connect the power cables to the power terminals in the electrical box:
1 Where necessary, loosen the screws on the power terminals in the electrical box.
2 Connect the power cables to the power terminals in the electrical box.
3 Tighten the screws on the power terminals in the electrical box.
4 Check that the power cables are correctly secured.
Follow the steps below to connect the earth wire to the earth terminal in the electrical box:
1 Where necessary, loosen the screw on the earthing terminal in the electrical box.
2 Connect the shielded part of the earth wire to the earth terminal.
3 Tighten the screw on the earth terminal in the electrical box.
4 Check that the shielded part of the earthing cables are correctly secured.
Firmly secure the cables using a tie inside the electrical box.
Cover the cables and the hole using a sealant to protect them from condensation and insects.
133
SMGB0063 rev. 1 - 10/2010
4