Electrical Wiring; The Precautions Of Electrical Wiring; Knockout Hole; Selecting Power Supply Cable And Breaker - Fujitsu AOU36RLAVM4 Installation Manual

6. ELECTRICAL WIRING

6.1. The precautions of electrical wiring

Wiring connections must be performed by a qualified person in accordance with
specifications.
The rated supply of this product is 60 Hz, 208/230 V of 1-phase. Use a voltage within
the range of 187-253 V
Make sure to perform earthing (grounding) work. Improper earthing (grounding) work
can cause electric shocks.
Before connecting the cables, make sure the power supply is OFF.
We suggest installing GFEB breakers or follow local electrical code. When installing
this system, install using ground fault equipment breakers (GFEB) to reduce the risk of
leaking current which may result in electric shock or potential fire.
Be sure to install a breaker of the specified capacity. When selecting breaker, please
comply with the laws and the regulations of each country. One breaker must be installed
on the power supply of the outdoor unit. Wrong selection and setup of the breaker will
cause electric shock or fire.
Do not connect AC power supply to the transmission line terminal board.
Improper wiring can damage the entire system.
Connect the connector cord securely to the terminal.
Faulty installation can cause a fire.
Do not modify power cable, use extension cable or branch wiring. Improper use may
cause electric shock or fire by poor connection, insufficient insulation or over current.
Make sure to secure the insulation portion of the connector cable with the cord clamp. A
damaged insulation can cause a short circuit.
Never install a power factor improvement condenser. Instead of improving the power
factor, the condenser may overheat.
CAUTION - Risk of Electric Shock
Before servicing the unit, turn the power supply switch OFF. Then, do not touch electric
parts for 20 minutes due to the risk of electric shock.
Always use a separate power supply line protected by a circuit breaker operating on all
cables with a distance between contact of 1/8 in (3 mm) for this unit.
Use ring terminals and tighten the terminal screws to the specified torques, otherwise,
abnormal overheating may be occurred and possibly cause serious damage inside the
unit.
Securely install the electrical box cover on the unit. An improperly installed service
panel can cause serious accidents such as electric shock or fire through exposure to
dust or water.
If the supply cable is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualified persons in order to avoid a hazard.
The primary power supply capacity is for the air conditioner itself, and does not include
the concurrent use of other devices.
Connect the power cables in positive phase sequence. If there is a missing phase con-
nection, the unit will not operate normally.
Do not crossover power supply wiring for the outdoor unit.
If the electrical power is inadequate, contact your electric power company.
Install a breaker in a location that is not exposed to high temperatures.
If the temperature surrounding the breaker is too high, the amperage at which the
breaker cuts out may decrease.
This system uses an inverter, which means that when used with a ground fault breaker
you must use breakers that can handle harmonics such as a (GFEB) Ground Fault
Equipment Breaker (100 mA or greater) in order to prevent malfunctioning of ground
fault device.
When the electrical switchboard is installed outdoors, place it under lock and key so that
it is not easily accessible.
Never bundle the power supply cable and transmission cable, remote control cable
together. Separate these cable by 2 in (50 mm) or more. Bundling these cables together
will cause miss operation or breakdown.
Always keep to the maximum length of the transmission cable. Exceeding the maximum
length may lead to erroneous operation.
The static electricity that is charged to the human body can damage the control PC
board when handling the control PC board for address setting, etc.
Please keep caution to the following points.
Provide the earthing (grounding) of Indoor unit, Outdoor unit and Option equipment.
Cut off the power supply (breaker).
Touch the metal section (such as the unpainted control box section) of the indoor or
outdoor unit for more than 10 seconds. Discharge the static electricity in your body.
Never touch the component terminal or pattern on the PC board.

6.2. Knockout hole

Be careful not to deform or scratch the panel while opening the knockout holes.
After opening the knockout hole, remove the burr on the edges to prevent snapping of
cables.
It is recommended to apply rust proof paint on the edges to prevent rust.
WARNING
CAUTION
CAUTION
Knockout holes are provided for wiring.
Service
panel
Knockout holes are provided 3 each in front, lateral and rear sides.
Front connection Lateral connection

6.3. Selecting power supply cable and breaker

Obtain the distribution network operator's agreement about the power capacity of the
power supply system and specification of the cable. when you connect the outdoor unit
with the power supply.
Regulation of wire size and circuit breaker differs from each locality, please refer in ac-
cordance with local rules.
Select the power cable type and size in accordance with relevant local and national
regulations.
Make sure the specifications for local wiring power cable and branch wiring are in compli-
ance with local code.
Select the correct cable type and size according to the country or region's regulations.
Use copper conductors only.
Max. wire length: Set a length so that the voltage drop is less than 2%. Increase the wire
diameter when the wire length is longer.
Selecting power supply cable and breaker when connecting single outdoor unit.
Refer to the table for the breaker specifications of each installation condition.
Use Size
Power supply cable 8 AWG (8.4 mm²)
Model MCA
AOU36RLAVM4
29.8 A
AOU48RLAVM4
AOU60RLAVM4 37.7 A
MCA: Minimum Circuit Amp.
MAX. CKT. BKR: Maximum Circuit Breaker
• Select the appropriate breaker of the described specification according to the national or
regional standards.
• Select the breaker that enough load current can pass through it.
In case of connected outdoor unit
Breaker 1: Ground Fault Equipment Breaker (GFEB)
Breaker 2: Maximum Circuit Breaker (MAX. CKT. BKR)
GOOD
Transmission cable
208/230 V
~ 60 Hz
Breaker 2
Breaker 1
Outdoor unit power
supply cable
Rear connection
CAUTION
Remarks
2 cable + Ground, ~, 208/230 V
MAX. CKT. BKR GFEB
30 A
30 mA
0.1 s or less
40 A
208/230 V ~ 60 Hz
Indoor unit
power supply
cable
Breaker 1
Breaker 2
Remote controller cable
En-8