Wiring Method; Unit Wiring - Fujitsu Airstage ARUM24TLAV2 Installation Manual

6.2. Wiring method

EXAMPLE
Outdoor unit or RB unit *1
Transmission
Indoor unit
Remote
Transmission
control
Power supply
Breaker 2
Breaker 1
*2
Remote controller
(Master)
Power supply
*1: When connecting to the Heat Recovery System, refer to the installation manual of the
RB unit.
*2: The 3-wire type remote controller is not used.
(Crossover wiring of power supply)
Indoor unit
Power supply
Pull box
Breaker2
Breaker1
Power supply
Disconnect switch shall be installed between indoor unit and pull box.

6.3. Unit wiring

Before attaching the cable to terminal block.
6.3.1. Power supply cable
Adjust the length of power supply cable to avoid excessive tension with referring figure
below.
2-3/4 in
(70 mm)
Earth
2-3/4 in
(Ground) wire
(70 mm)
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 dam-
aged 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 spe-
cial 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
Breaker 2 Breaker 2
Breaker 1 Breaker 1
*2 *2
Remote controller
(Slave)
controller
Indoor unit Indoor unit
Power supply Power supply
Pull box
: Disconnect switch
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 dam-
aged 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)
Remote
Cable
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.
M4 screw
(Power supply/L1, L2 (N), GND)
6.3.2. Transmission and Remote controller cable
Transmission cable
1 in (25 mm)
Shield
cable
(no film)
1-3/8 in
(35 mm)
• When the 2 cables are attached:
GOOD
Tighten the terminal screws to the specified torques, otherwise, abnormal overheating
may be produced and possibly cause heavy damage inside the unit.
M3 screw
(Transmission /X1, X2)
(Remote controller /Y1, Y2)
To peel the film from the lead cable, use a dedicated tool that will not damage the
conductor cable.
When installing a screw on the terminal block, do not cut the cable by overtightening the
screw. On the other hand, an under tightened screw can cause faulty contact, which will
lead to a communication failure.
Ring terminal
Screw with special
Screw with
washer
special washer
Ring terminal
Terminal block
WARNING
Tightening torque
11 to 16 lbf·in
(1.2 to 1.8 N·m)
Remote controller cable
1 in (25 mm)
PROHIBITED
Different diameter Connect to 1 side
WARNING
Tightening torque
4.4 to 5.3 lbf·in
(0.5 to 0.6 N·m)
CAUTION
Sleeve
Ring terminal
Cable
En-8