Electrical Wiring; General Check - Hitachi CH-UNIT Installation And Operation Manual

ELECTRICAL WIRING

Piping Insulation
¡
CH-6.0N1
CH-10.0N1
ID: Inner Diameter

NOTE:
- In case that the humidity inside the ceiling is high, apply additional insulation to the flare nut connection.
- Refer to the chapter initial check for more details.
6. ELECTRICAL WIRING

WARNING:
Turn OFF the main power switch to the CH unit, the indoor unit and the outdoor unit before electrical wiring work or a
−
periodical check is performed.
Protect the wires, electrical parts, etc. from rats or other vermin.
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Use a medium sensing speed type ELB (Electric Leakage Breaker, activation speed of 0.1 sec. or less). If not used, it will
−
cause an electric shock or a fire.
Fix the cables securely. External forces on the terminals could lead to a fire
¡

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 electrical box.
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Use twisted shielded pair cable or shield pair cable for transmission wires between the indoor and the outdoor units (Max.
−
1000m), and connect the shielded part to the earth screw in the electrical box of the indoor unit as shown the next page figure.

6.1. GENERAL CHECK

- 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 indicated in Technical Catalogue. Make sure that
the components comply with National Electrical code (NEC)
- Check to ensure that the power supply voltage is within ±10% of rated voltage.
- Check the power source capacity is too low, the system cannot be started due to the voltage drop.
- Check to ensure that the ground wire is connected.
Insulation Clamp
(ID38)
Insulation
CH Unit
(ID16)
(Upper Surface)
Clamp
Insulation
(ID38)
Insulation
(ID43)
Clamp
Insulation
(ID22)
CH Unit
(Upper Surface)
Insulation
(ID20)
Insulation
(ID43)
Insulation
(ID38)
Insulation
(ID16)
Insulation
(ID43)
Insulation
Clamp
(ID22)
PMML0204 rev.0-05/2010
20