General Notes; General Check - Hitachi RAS-2-HVNP Service Manual

4. Electrical wiring

4.1 General notes

C A U T I O N
• Before any electrical wiring work or regular inspections, switch off the main power supply switches of the in-
door and outdoor units. Wait three minutes before starting installation or maintenance work.
•
Make sure that the indoor and outdoor are completely stopped before starting work on the electrical wiring or
regular inspections.
• Protect cables, drain hose, electric parts, etc. from rodents and insects; otherwise these might damage unpro-
tected components and, in the worst case, cause a fire.
• Wrap the accessory packing around the wires, and plug the wiring connection hole with the seal material to
protect the product from any condensed water and insects.
• Do not allow cables to come into contact with the refrigerant pipes, metal edges, printed circuit boards (PCB)
or the electric parts inside the unit; the cables may be damaged and, in the worst case, cause a fire.
• Tightly secure the wires with the cord clamp inside the indoor unit.
• Lead the wires through the knockout hole in the side cover when using conduit.
• Secure the cable of the remote control switch with the cord clamp inside the electrical box.
• Electrical wiring must comply with national and local codes. Contact your local authority in regards to stan-
dards, rules, regulations, etc.
D A N G E R
• Do not connect of adjust any wiring or connections unless the main power switch is OFF.
• Use an earth leakage breaker with medium sensitivity, and an activation speed of 0.1 sec or less. If this is not
fitted, there is a risk of electric shock and/or fire.
• Install an earth leakage breaker, fuse and circuit breaker for each outdoor unit power line. Not fitting it may
cause an electric shock or fire.
• Never connect the earth cable to the refrigerant pipes. The gas in the pipes could cause a fire.
• Do not connect the earth cable to the lighting arrest system. The electrical potential of earth would increase
abnormally.
N O T E
• Fix the rubber bushes with adhesive when the outdoor unit ducts are not used.
4.1.1 General check
1 Ensure that the field-supplied electrical components (mains power switches, circuit breakers, wires, connectors and
wire terminals) have been properly selected according to the electrical data indicated. Make sure that they comply with
national and regional electrical codes.
2 Following the Council Directive 2004/108/EC(89/336/EEC), relating to electromagnetic compatibility, next table indicates:
Maximum permissible system impedance Z
3-11.
88
SMGB0079 rev.0 - 01/2013
at the interface point of the user's supply, in accordance with EN61000-
max