3P405106-10 English
10
6. ELECTRIC WIRING WORK
6-1 General instructions
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All wiring must be performed by an authorized electrician.
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All field supplied parts and materials, electric works must conform to local codes.
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Always ground wires. (In accordance with national regulations of the pertinent country.)
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Always turn off the power before performing the electric wire installation work.
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Follow the “WIRING DIAGRAM” attached to the unit body to wire the outdoor unit and indoor units.
•
Properly connect wire of the specified wire type and copper thickness. Also use the included clamp to
avoid applying excessive force to the terminal (field wire, ground wire).
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Do no let the ground wire should come in contact with gas pipes, water pipes, lighting rods, or telephone ground
wires.
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Gas pipes: gas leaks can cause explosions and fire.
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Water pipes: cannot be grounded if hard vinyl pipes are used.
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Telephone ground and lightning rods: the ground potential when struck by lightning gets extremely
high.
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A circuit breaker capable of shutting down the power supply to the entire system must be installed.
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This system consists of multiple Branch Selector unit. Mark each Branch Selector unit as unit A, unit B . . . ,
and be sure the terminal board wiring to the outdoor unit and indoor unit are properly matched. If wiring and
piping between the out door unit, Branch Selector unit and an indoor unit are mismatched, the system may
cause a malfunction.
•
Do not turn on the power supply (branch switches, overload interrupters) until all other work is done.
6-2 Example for the whole system
Power supply wiring
Transmission wiring
Circuit protection
safety devices in
accordance with local
and national codes
Outdoor unit
Power supply
Power supply
Main switch
Main switch
Branch
Selector
unit
Indoor unit
Remote controller
Cooling/Heating selectable indoor unit
Cooling-dedicated
indoor unit
6-3 Power circuit, safety device and cable requirements
•
A power circuit (
refer to Table 6) must be provided for connection of the unit. The circuit must be pro-
tected with safety devices in accordance with local and national codes. i.e a fuse, a circuit breaker or a
GFCI.
•
When using residual current operated circuit breakers, be sure to use a high-speed type (0.1 second or
less) 30 mA rated residual operating current.
•
Use copper conductors only.
•
Use insulated wire for the power cord.
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Select the power supply cable type and size in accordance with relevant local and national regulations.
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Use vinyl cord with sheath or cable (2-wire) of AWG 18-16 for transmission wiring.
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