Wiring Method; Unit Wiring - Fujitsu Airstage ARXC072GTEH Installation Manual

6.1.1. Cable specifi cations
Follow the specifi cations below for the power supply, transmission and remote controller
cable.
Recommended
2
cable size (mm )
Power supply
2.5
cable
Transmission
0.33
cable
Remote control-
ler cable 0.33 to 1.25
(2-wire type)
*: Use shielded cable in accordance with local rules for remote controller cable.

6.2. Wiring method

Example
Outdoor unit or RB unit *1
Transmission
Indoor unit
Remote
Transmission
control
*2
Power supply
Breaker
*3
Power supply Remote controller
(Master)
*1: When connecting to the Heat Recovery System, refer to the installation manual of the
RB unit.
*2: Earth (Ground) the remote controller if it has an earth (ground) cable.
*3: The 3-wire type remote controller is not used.
(Crossover wiring of power supply)
Indoor unit
Power supply Power supply
Pull box
Breaker
Power supply

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 fi gure
below.
Earth (Ground)
cable
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 specifi ed 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 fi x 2 power supply cables with 1 screw.
Cable type Remark
Type 60245 IEC57 or
2 Cable + earth (ground)
equivalent
22 AWG LEVEL 4 (NEMA)
LONWORKS compat- non-polar 2 core, twisted
ible cable pair solid core diameter
0.65 mm
Non-polar 2 core, twisted
Sheathed PVC cable*
pair
Indoor unit Indoor unit
*2 *2
Breaker
Breaker
*3
Remote controller
Remote controller
(Slave)
Indoor unit Indoor unit
Power supply
Pull box
25 mm
35 mm
Strip 25 mm
Cable
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.
B. For strand wiring
(1) Use ring terminals with insulating sleeves as shown in the fi gure 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 specifi ed 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 for the terminal screw tightening torques.
(7) Please do not fi x 2 power supply cables with 1 screw.
Strip 10 mm
*3
Cable
Use ring terminals and tighten the terminal screws to the specifi ed torques, otherwise,
abnormal overheating may be produced and possibly cause heavy damage inside the
unit.
M4 screw
(Power supply/L, N, GND)
6.3.2. Transmission and Remote controller cable
Transmission cable
25 mm
Shield cable
35 mm
(no film)
• Connect remote controller and transmission cables as shown in Fig. B.
• When the 2 cables are attached.
Fig. B
GOOD
Screw with
Screw with
special washer
special washer
Cable end (Loop)
Terminal block
WARNING
Ring terminal
Screw with special
Screw with
washer
special washer
Ring terminal
Terminal block
WARNING
Tightening torque
1.2 to 1.8 N·m
(12 to 18 kgf·cm)
Remote controller cable
25 mm
PROHIBITED
Different diameter Connect to 1 side
Loop
Cable end
(Loop)
Cable
Sleeve
Ring
terminal
Cable
En-8