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Tools and Instruments- One Set of Wiring Tools, Electrical Tester (Clamp Meter).
Schedule Check - Confirm that the field-selected electrical components (main power switch, fuses,
wires, conduit connections, wire terminals) are properly selected according to "Electrical Data" in
Technical catalogⅠand ensure that they comply with national and local codes. It is recommended that
the main power switch be locked on the "OFF" position, to prevent against accidental supply of power
during unit servicing.
Main Power Wiring Procedures - Confirm that electrical power is not being supplied to the installation
location prior to any electrical installation work.
1. Install the field-supplied main switch box in the properly selected location.
2. Install conduit connectors in the hole for power wiring.(knockout holes).
3. Lead main power wires and the earth wire through the connector to the screw terminals for main
power and earth wire in the unit. The neutral wire for 380V and 415V power supplies should also be
led through the connector.
Condensing Unit
Firmly connect the wires with wire terminals to the unit screw terminals R(L1),S(L2) and T(L3) and also
Mp(N) for 380V and 415V power supplies according to Fig. 6 or the wiring label attached to the magnetic
switch box. A scroll compressor is equipped. Because that the rotation direction of the orbiting scroll of
the HITACHI scroll type compressor is fixed, therefore a reverse & single phase sequence protection
relay is equipped in this unit. If each phase R, S or T of the power source is incorrectly connected, the
compressor does not start due to the activation of the reverse & single phase sequence protection relay.
Therefore, in order to check the correct wiring connection, the utilization of a phase sequence indicator is
recommended when the unit is started after installation of the unit.
(1) If the phase is wrong, exchange two of the three wires connected from the main power source to the
main terminals of the unit as indicated with dotted lines, and then check the rotation direction of the
phase sequence indicator once again. Do not exchange the wires in the unit in order to protect the
compressor against the reversal rotation.
(2) Do not operate the compressor by depressing the button of the magnetic switch for the compressor.
Cooling Unit
The power supply wires are to be led from the outlet terminals in the condensing unit for the evaporator
fan motor and can be directly reached to the motor terminals. A three-phase fan motor is equipped in the
cooling unit, therefore the fan motor rotation should be checked.
Control Wiring - Install the optional room thermostat at a suitable location in the space to be
air-conditioned. Connect the control wires between the unit terminals and the thermostat terminals
according to Fig. 6 or the wiring label. If a locally-supplied thermostat and switch are installed, connect
the wiring according Technical Catalog Ⅰ.
NOTE:
The setting and the capacity of the overcurrent relay and the magnetic contactor equipped in the
condensing unit are only applicable for the cooling unit of the HITACHI Standard Split System. When
other cooling unit is to be connected, it might be necessary to change them in accordance with the
electrical characteristics of the cooling unit.
Electrical Wiring
ELECTRICAL WIRING
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