Electrical Wiring; Wiring System Diagram; Connection Cable Preparation - Fujitsu 9384203007-04 Manuel D'installation

Torque wrench
Indoor unit pipe
(Body side)
Flare nut [in (mm)]
1/4 (6.35) dia.
3/8 (9.52) dia.
1/2 (12.70) dia.
5/8 (15.88) dia.
3/4 (19.05) dia.

3. 7. Electrical wiring

• 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 manu-
facturer. 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. Im-
properly connected or secured cables can cause serious accidents such as overheat-
ing 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 expo-
sure to dust or water.
• Install sleeves into any holes made in the walls for wiring. Otherwise, a short circuit
could result.
• Install a ground leakage breaker. In addition, install the ground leakage 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 control 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.
• Connect the connection cable fi rmly to the terminal board. Imperfect installation may
cause a fi re.
• 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 shocks.
• Do not connect power supply cables to the transmission or remote control terminals,
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 dis-
charge static electricity charged in the body.
– Do not touch terminals of parts and patterns implemented on PCB.
9384203007-04.indb 11 9384203007-04.indb 11
Tighten with 2 wrenches.
Holding Wrench
Flare nut
Connection pipe
Tightening torque [ft·lb (N·m)]
12 to 13 (16 to 18)
24 to 31 (32 to 42)
36 to 45 (49 to 61)
46 to 55 (63 to 75)
66 to 81 (90 to 110)
WARNING
CAUTION

3. 7. 1. Wiring system diagram

■ Connection cable (to outdoor unit)
Indoor unit
Earth (ground) line
Disconnect switch
(Locally purchased)
NOTES: Disconnect Switch - Field supplied if required by local code. Select the correct
capacity of disconnect switch according to the load.
■ Wired remote controller cable
Red
White

3. 7. 2. Connection cable preparation

■ Connection cable
Keep the earth (ground) wire longer than the other wires.
Earth (ground)
wire
■ Remote controller cable
1-3/16 in (30 mm)
3. 7. 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.
(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,
abnormal overheating may be produced and possibly cause serious damage inside the
unit.
Tightening torque [lbf·in (N·m)]
M4 screw 11 to 16 (1.2 to 1.8)
Screw with
special washer
Wire
Ring
terminal
Terminal blocks
3. 7. 4. Connection wiring
CAUTION
• Be careful not to mistake the power supply cable and connection wires when install-
ing.
• Install so that the wires for the remote controller will not come in contact with other
connection wires.
Power line
Control line
Conduit connector
Ring terminal
Sleeve
Screw with
special
washer
Wire
Ring
terminal
En-11
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