Electrical Wiring; General Check; Electrical Wiring Connection - Hitachi airCore 700 Operation Installation Maintenance Manual

7. Electrical Wiring

7. Electrical Wiring
WARNING
!
•
Turn OFF the main power switch of the indoor unit and the outdoor unit and wait for more than 10
minutes before electrical wiring work or a periodical check is performed.
•
Check to ensure that the indoor fan and the outdoor fan have stopped before electrical wiring work or a
periodical check is performed.
•
Protect the wires, drain pipe, electrical parts, etc. from rats or other small animals. Otherwise, rats may
gnaw at unprotected parts and at the worst, a fire will occur.
•
Tighten screws according to the following torque.
M3.5 : 1.2 N·m
M5 : 2.0 to 2.4 N·m
•
The ground wire must be longer than the current-carrying conductor when installing the power cord.
•
Using the air conditioner power terminal to transfer the power cord is strictly prohibited. A power
distribution box can be used to expand the power distribution on the indoor unit.
CAUTION
!
•
Wrap the accessory packing around the wires, and plug the wiring connection hole with the seal
material to protect the product from any condensate water or insects.
•
Tightly secure the wires with the cord clamp inside the indoor unit.
•
Secure the cable of the remote control switch using the cord clamp inside the electrical box.

7.1 General Check

(1) 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 "Technical Catalog". Make sure that the components comply with National Electrical
Code (NEC).
(2) Check to ensure that the power supply voltage is within ±10% of the rated voltage.
(3) 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.
(4) Check to ensure that the ground wire is connected.
(5) Power Source Main Switch
Install a multi-pole main switch with a space of 3.5mm or more between each phase.

7.2 Electrical Wiring Connection

The electrical wiring connection for the indoor unit is shown in Fig.7.1 (for 3.0 - 4.0HP models) or
Fig.7.2 (for 5.0 - 6.5HP models).
(1) Connect the cable of an optional remote control switch or an optional extension cable to the connectors
on the printed circuit board inside the electrical box through the connecting hole in the cabinet.
(2) Connect the power supply and earth wires to the terminals in the electrical box.
(3) Connect the wires between the indoor unit and the outdoor unit to the terminals in the electrical box.
(4) Tightly clamp the wires using the cord clamp inside the electrical box.
Outdoor Unit
Transmission
TB2
(Transmission)
1 2
Communication cable
Indoor Unit
R,S,C
1 2 A B
Power Supply
-15-
N
L
(220-240V~50Hz)