Wiring Method; Unit Wiring - Fujitsu AIRSTAGE ARUX12TLAV2 Installation Manual

5.2. Wiring method

Example
Outdoor unit or RB unit (*1)
Transmission
Indoor unit
Remote
Transmission
control
Power supply
(*2)
Breaker 2
Breaker 1
Remote controller
(Master)
Power supply
Breaker shall be located in sight from and readily accessible from all indoor units.
*1: When connecting to the Heat recovery system, refer to the installation manual of the RB
unit.
*2: Ground (Earth) the remote controller if it has an ground (earth) cable.

5.3. Unit wiring

Before attaching the cable to terminal block.
5.3.1 Power supply cable
• Adjust the length of power supply cable to avoid excessive tension.
• Keep the earth (ground) wire longer than the other wires.
Earth (Ground) wire
A. For solid core wiring
(1) To connect the electrical terminal, follow the below diagram and connect after looping it
around the end of the cable.
(2) Use the specified cables, connect them securely, and fasten them so that there is no
stress placed on the terminals.
(3) 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.
(4) Do not tighten the terminal screws too much, otherwise, the screws may break.
(5) See the table for the terminal screw tightening torques.
(6) Please do not fix 2 power supply cables with 1 screw.
Strip 1 in
(25 mm)
Screw with
special washer
Cable
Cable end (Loop)
Terminal block
When using solid core cables, do not use the ring terminal. If you use the solid core cables
with the ring terminal, the ring terminal's pressure bonding may malfunction and cause the
cables to abnormally heat up.
Breaker 1: Ground Fault Equipment
Breaker (GFEB)
Breaker 2: Maximum Circuit Breaker
(MAX. CKT. BKR)
Indoor unit Indoor unit
(*2) (*2)
Breaker 2 Breaker 2
Breaker 1
Breaker 1
Remote controller Remote controller
(Slave)
Conduit connector
Loop
Screw with spe-
cial washer
Cable end
(Loop)
Cable
WARNING
B. For strand wiring
(1) Use ring terminals with insulating sleeves as shown in the figure below 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 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 for the terminal screw tightening torques.
(7) Please do not fix 2 power supply cables with 1 screw.
Strip 3/8 in
(10 mm)
Screw with spe-
cial washer
Cable
Ring terminal
Terminal block
Use ring terminals and tighten the terminal screws to the specified torques, otherwise,
abnormal overheating may be produced and possibly cause heavy damage inside the unit.
Tightening torque
M4 screw (Power supply/L1, L2 (N), GND)
5.3.2 Transmission and Remote controller cable
Transmission cable
1 in (25 mm)
Shielded cable
1-3/8 in (35 mm)
(no film)
• Connect remote controller and transmission cables as shown in figure below.
GOOD
Different diameter
Tighten the terminal screws to the specified torques, otherwise, abnormal overheating may
be produced and possibly cause heavy damage inside the unit.
Terminal number
M3 screw
• Transmission: X1, X2
• Remote controller: Y1, Y2 (Do not connect to Y3)
To peel the film from the lead cable, use a dedicated tool that will not damage the conduc-
tor cable.
When installing a screw on the terminal block, do not cut the cable by overtightening the
screw. On the other hand, an undertightened screw can cause faulty contact, which will
lead to a communication failure.
Ring terminal
Sleeve
Screw with spe-
cial washer
Ring
terminal
Cable
WARNING
11 to 16 lbf·in (1.2 to 1.8 N·m)
Remote controller cable
1 in (25 mm)
PROHIBITED
Connect to 1 side
WARNING
Tightening torque
4.4 to 5.3 lbf·in
(0.5 to 0.6 N·m)
CAUTION
En-12