Fujitsu Airstage AOU120RLAVL Installation Manual Download Page 11

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En-10

Example: Disable Automatic Address setting

Refrigerant
system 1

Refrigerant
system 2

Refrigerant
system 3

Transmission line

Example: Enable Automatic Address setting

Refrigerant
system 1

Refrigerant
system 2

Refrigerant
system 3

Transmission line

6.5. Wiring method

6.5.1 Connection diagrams

L1 L2 L3

Breaker 1: Ground Fault Equipment

Breaker (GFEB)

Breaker 2: Maximum Circuit Breaker

(MAX. CKT. BKR)

Power supply
208/230V 3~ 60Hz

To other refrigerant circuit
outdoor unit

Outdoor unit

Transmission

Power supply

Remote control

Power supply

Indoor unit

Power supply

208/230V ~ 60Hz

Remote
controller

Power supply

208/230V ~ 60Hz

Power supply

208/230V ~ 60Hz

Indoor unit

Breaker 1

Breaker 2

*1: The number of power supply terminals is different depending on the indoor unit

model. For the wiring, refer to the indoor unit installation manual.

• There are two types of remote controller: the 2-wire type and the 3-wire type. For details,

see the relevant remote controller installation manual. (When connecting the 2-wire type
remote controller, Y3 is not used.)

The wiring example for outdoor and indoor units is shown in figure.

6.5.2 Wiring procedure

• Remove the service panel. And connect the cable to the terminal in accordance with the

terminal name plate.

• Use a ring terminal to connect the electric cables to the power supply terminal board.
• Keep the earth cable longer than the other cables.
• After connecting the electric cable, secure them with a cable clamp.
• Connect the cable without applying excessive tension.
• Use the specified cable type and connect the cable securely.

Secure with a cable
clamp as shown in the
figure below.

Tightening torque

[lbf·ft (N·m)]

M3 screw

4.4 to 5.3 (0.5 to 0.6)

M5 screw

17.7 to 26.5 (2.0 to 3.0)

Power supply terminal

Ring
terminal
(M5)

Transmission terminal (M3)

Power supply cable

Conduit

Power supply
cable

Transmission cable

Transmission
cable

Push mount
cable tie
(accessories)

Push mount cable tie
(accessories)

Earth
(ground)
cable

5/16 to 3/8 in

(8 to 10 mm)

1 to 1-9/16 in

(25 to 40 mm)

How to connect wiring to the terminal

Caution when wiring cable
(1) Use ring terminals with insulating sleeves as shown in the figure to connect to the

terminal block.

(2) Securely clamp the ring terminals to the cables using an appropriate tool so that

the cables do not come loose.

(3) Use the specified cables, 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 screw-

driver 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.

Strip 3/8 in

(10 mm)

Cable

Screw with
special washer

Ring terminal

Terminal block

Ring terminal

Sleeve

Screw with
special washer

Ring terminal

Cable

Shielding the transmission cable

Connect both ends of the shielded
wire of the transmission cable to
the earth (ground) terminal of the
equipment or to the earth (ground)
screw near the terminal.
Be sure to use one side of a twisted
pair cable when using transmission
cable with 2 sets of twisted pair
cables.

Wind with insulation tape to prevent short circuit

Use one side
of the twisted
pair cable

Connect both ends of shielded
wire to earth (Ground).

Attaching the conduit

Front connection

Cable (with
conduit)

lock nut

Lateral connection

• Fix the conduit with the supporters as shown below.

Supporter

Conduit (Power supply cable)

Outdoor unit