Electrical Wiring - Fujitsu AUXG-KRLB Series Installation Manual

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3. 6. Electrical wiring

WARNING
• Electrical work must be performed in accordance with this Manual by a person certi-
fi ed under the national or regional regulations. Be sure to use a dedicated circuit for
the unit.
An insuffi cient power supply circuit or improperly performed electrical work can
cause serious accidents such as electric shock or fi re.
• Before starting work, check that power is not being supplied to the indoor unit and outdoor
unit.
• Use the included connection cables and power cables or ones specifi ed by the man-
ufacturer. Improper connections, insuffi cient insulation, or exceeding the allowable
current can cause electric shock or fi re.
• For wiring, use the prescribed type of cables, connect them securely, making sure
that there are no external forces of the cables applied to the terminal connections.
Improperly connected or secured cables can cause serious accidents such as over-
heating the terminals, electric shock, or fi re.
• Do not modify the power cables, use extension cables, or use any branches in the
wiring. Improper connections, insuffi cient insulation, or exceeding the allowable cur-
rent can cause electric shock or fi re.
• Match the terminal board numbers and connection cable colors with those of the
outdoor unit. Erroneous wiring may cause burning of the electric parts.
• Securely connect the connection cables to the terminal board. In addition, secure
the cables with wiring holders. Improper connections, either in the wiring or at the
ends of the wiring, can cause a malfunction, electric shock, or fi re.
• Always fasten the outside covering of the connection cable with the cable clamp. (If
the insulator is chafed, electric leakage may occur.)
• Securely install the electrical box cover on the unit. An improperly installed electrical box
cover can cause serious accidents such as electric shock or fi re through exposure to dust or
water.
• Install sleeves into any holes made in the walls for wiring. Otherwise, a short circuit could
result.
• Install a earth (ground) leakage breaker. In addition, install the earth (ground) leak-
age breaker so that the entire AC main power supply is cut off at the same time.
Otherwise, electric shock or fi re could result.
• Always connect the earth (ground) cable.
Improper earthing (grounding) work can cause electric shocks.
• Install the remote controller cables so as not to be touched directly with your hand.
• Perform wiring work in accordance with standards so that the air conditioner can be
operated safely and positively.
• Unit shall be earthed (grounded) in compliance with the applicable local and national
codes.
CAUTION
• If the indoor unit connection cable and power supply are wired incorrectly, the air
conditioner may be damaged or cause malfunction.
• Ground the unit.
Do not connect the earth (ground) cable to a gas pipe, water pipe, lightning rod, or a
telephone earth (ground) cable.
Improper earthing (grounding) may cause electric shock.
• Do not connect power supply cables to the transmission or remote controller termi-
nals, as this will damage the product.
• Never bundle the power supply cable and transmission cable together. Bundling
these cables together will cause miss operation.
• When handling PCB, static electricity charged in the body may cause malfunction of
the PCB. Follow the cautions below:
̵ Establish a ground for the indoor and outdoor units and peripheral devices.
̵ Cut power (breaker) off.
̵ Touch metal part of the indoor and outdoor units for more than 10 seconds to
discharge static electricity charged in the body.
̵ Do not touch terminals of parts and patterns implemented on PCB.
• Be careful not to generate a spark as follows for using a fl ammable refrigerant.
̵ Do not remove the fuse while power is on.
̵ Do not disconnect plug from the wall outlet and the wiring while the power is on.
̵ It is recommended to position the outlet connection in a high position. Place the
cords so that they do not get tangled.
3.6.1. Wiring system diagram
Connection cable to outdoor unit
Earth (ground) line
Power line
Control line
Wired remote controller cable
2-wire type
3-wire type
Red
Red
or
White
White
Black
3.6.2. Connection cable preparation
■ Connection cable
Keep the earth (ground) wire longer than the other wires.
Connection cable
Earth (ground)
wire
• Use a 4-core wire cable.
■ Remote controller cable
For 2-wire type
For 3-wire type
30 mm
30 mm
3.6.3. How to connect wiring to the terminals.
(1) Use ring terminals with insulating sleeves as shown in the fi gure below to connect to
the terminal block.
(2) Securely crimp the ring terminals to the wires using an appropriate tool so that the
wires do not come loose.
Ring terminal
Sleeve
(3) Use the specifi ed wires, connect them securely, and fasten them so that there is no
stress placed on the terminals.
(4) Use an appropriate screwdriver to tighten the terminal screws.
Do not use a screwdriver that is too small, otherwise, the screw heads may be
damaged and prevent the screws from being properly tightened.
(5) Do not tighten the terminal screws too much, otherwise, the screws may break.
(6) See the table below for the terminal screw tightening torques.
WARNING
Use ring terminals and tighten the terminal screws to the specifi ed torques, otherwise,
it may cause abnormal overheating and possibly cause serious damage inside the
unit.
Tightening torque [N·m (kgf·cm)]
M4 screw
1.2 to 1.8 (12 to 18)
Screw with
Screw with
special washer
special
washer
Wire
Ring terminal
Wire
Ring terminal
Terminal blocks
En-9

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