Electrical Wiring; Selecting Circuit Breaker And Wiring; Notes For Electrical Wiring - Fujitsu WOYK150LJL Installation Manual

Air to water heat pump outdoor unit
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Check if the steel cylinder has a siphon installed or not before fi lling. (There is an indi-
cation "with siphon for fi lling liquid" on the steel cylinder.)
Filling method for cylinder with siphon
Set the cylinder vertical and fi ll with the liquid.
(Liquid can be fi lled without turning bottom up with the
siphon inside.)
Filling method for other cylinders
Turn bottom up and fi ll with liquid.
(Be careful to avoid turning over the cylinder.)
Be sure to use the special tools for R410A for pressure resistance and to avoid mixing
of impure substances.
If the units are further apart than the maximum pipe length, correct operation cannot be
Make sure to back closing valve after refrigerant charging. Otherwise, the compressor
may fail.
Minimize refrigerant release to the air. Excessive release is prohibited under the Freon
Collection and Destruction Law.
5.8.1. If additional refrigerant is required
• When the piping is longer than chargeless piping length, additional charging is neces-
1) Remove the charging cap from the liquid pipe.
2) Attach a charging hose to the refrigerant cylinder, and connect it to the charging
3) Add refrigerant by calculating the additional refrigerant volume in accordance with
the table below.
4) Remove the charging hose and install the charging cap.
5) Remove the body caps (gas pipe, and liquid pipe), and open the valves.
6) Close the body caps.
* Tighten the body caps and charging caps to the torque values specifi ed in the Table A.
To open and close the valves;
Use an M5 hexagon wrench for liquid pipes.
Use an M10 hexagon wrench for gas pipes.
Piping length (L1) *Chargeless [m]
Additional charging amount
L1* > Chargeless piping length
Refrigerant pipe size
[mm (in.)]
~15 m
9.52 (3/8)
Liquid Gas
15.88 (5/8)
Refer to "4.3. Refrigerant pipe size and allowable piping length".


6.1. Selecting circuit breaker and wiring

• Decide the diameter of wire referring to below table "Breaker and wiring
specifi cations" in accordance with local and national codes.
Breaker and wiring specifi cations
Power supply cable
Conductor size
2.5 min.
*: If the transmission wire is longer than 50m, use a bigger conductor size.
• Use confi rmed cable with type 245 IEC 57.
• Perform all electrical work according to standard.
• Install a circuit breaker with a contact gap of at least
3 mm in all poles near the units. (Both indoor units and outdoor units)
• Install the circuit breaker near the units.
Piping length
20 m
25 m
30 m
250 g
500 g
750 g
Transmission cable*
Conductor size
Max. length
1.5 min.

6.2. Notes for electrical wiring

Wiring connections must be performed by a qualified person in accordance with speci-
The rated supply of this product is 50 Hz, 400 V of 3-phase, 4-wire. Use a voltage within
the range of 342 to 456 V (50 Hz).
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 fire.
Select a breaker (Included with earth leakage circuit breaker) of appropriate capacity
and install one at every power supply of an outdoor unit. Wrong selection of breakers or
transition wiring will lead to electric shock and fire.
Do not connect AC power supply to the transmission line terminal board.
Improper wiring can damage the entire system.
Install a breaker (Included with earth leakage circuit breaker) in accordance with the
related laws and regulations.
Connect the connector cable securely to the terminal.
Faulty installation can cause a fire.
Make sure to secure the insulation portion of the connector cable with the cable 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 electric
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.
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.
Use ring terminals and tighten the terminal screws to the specified torques, otherwise,
abnormal overheating may be produced and possibly cause serious damage inside the
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 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
50 g/m
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 earth
leakage circuit 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 connection 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 connection 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 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.
How to connect wiring to the terminal
Caution when wiring cable
• When stripping off the coating of a lead wire, always use a special tool such as a wire
stripper. If there is no special tool available, carefully strip the coating with a knife etc.
(1) Use ring terminals with insulating sleeves as shown in the fi gure below to connect
to the terminal block.
(2) Securely clamp the ring terminals to the wires using an appropriate tool so that the
wires do not come loose.
Strip : 10 mm
Ring terminal


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