Electrical Wiring; The Precautions Of Electrical Wiring - Fujitsu AirStage AJYA72GALH Installation Manual

To prevent the oil from settling in the stopped unit, install the pipes between the
outdoor units so that they are level or are tilted upward to the outdoor units.
(1) Examples of multiple unit installation are shown below.
a) Installable patterns
Master Slave
Good
unit unit 1
To indoor unit
Master Slave
Good
unit unit 1
To indoor unit
Slave
Good
Master
unit 1
unit
To indoor unit
b) Non-installable patterns
Prohibited Master Slave
unit unit 1
To indoor unit
Master Slave
Prohibited
unit unit 1
To indoor unit
Master Slave
Prohibited
unit unit 1
To indoor unit
(2) If the pipe length between outdoor unit branch kit and outdoor unit branch kit (or
slave unit) is longer than 2 m, or a lower pipe line exists between outdoor units,
rise for gas pipe (Discharge gas pipe and Suction gas pipe) should be arranged
to eliminate oil from entering into and remaining at pipes and the stopped outdoor
unit. However, there is no need to provide a rise on the pipe connecting between
the master unit and the indoor unit even if the length exceeds 2m.
Master Slave
unit unit 1
To indoor unit
2 m or less 2 m or less
Master
unit
To indoor unit
2 m or less
2 m or more
Master Slave
unit unit1
To indoor unit
En-11
CAUTION
Slave
unit 2
Slave
unit 2
Slave
unit 2
Slave
unit 2
Slave
unit 2
Slave
unit 2
Slave
unit 2
Suction gas pipe
Discharge gas pipe
Slave Slave
unit1 unit2
Rise
(200 mm or more)
Suction gas pipe
Discharge gas pipe
2 m or less
2 m or more
Slave
unit2
Rise
Suction gas pipe
lower pipe
Discharge gas pipe
6.

ELECTRICAL WIRING

6. 1.

The precautions of electrical wiring

WARNING
Wiring connections must be performed by a qualifi ed person in accordance with
specifi cations.
The rated supply of this product is 50Hz, 400V of 3-phase, 4-wire. Use a voltage
within the range of 342-456V.
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.
Be sure to install an earth (ground) leakage breaker. Otherwise, it will cause electric
shock or fi re.
Be sure to install a breaker of the specifi ed 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 fi re.
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 fi re.
Do not modify power cable, use extension cable or branch wiring. Improper use may
cause electric shock or fi re by poor connection, insuffi cient 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.
Before servicing the unit, turn the power supply switch OFF. Then, do not touch elec-
tric parts for 10 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 3 mm for this unit.
Use crimp-type terminals and tighten the terminal screws to the specifi ed torques,
otherwise, abnormal overheating may be produced and possibly cause serious dam-
age 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 fi re through exposure to
dust or water.
If the supply cable is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualifi ed 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 they are connected in
negative phase sequence, an error will be displayed. If there is a missing phase con-
nection, the unit will not operate normally. Do not connect a N phase (neutral phase)
cable to other phases (misconnection). Wrong wiring will lead to parts damage.
Do not use crossover power supply wiring for the outdoor unit.
If the electrical power is inadequate, contact your electric power company.
Install a breaker (Included with earth leakage circuit 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.
Use a breaker (Included with earth leakage circuit breaker) that is capable of handling
high frequencies. Because the outdoor unit is inverter controlled, a high-frequency
breaker is necessary to prevent a malfunction of the breaker itself.
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 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 maxi-
mum 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.
CAUTION