Electrical Requirement; Wiring Method; Unit Wiring - Fujitsu AirStage AUXB12GALH Installation Manual

6.1. Electrical requirement

Voltage rating
Operating range
• Select the power cable type and size in accordance with relevant local and national
regulations.
• Specifi cations for local wiring power cord and branch wiring are in compliance with local code.
• Max. wire length: Set a length so that the voltage drop is less than 2%. Increase the wire
diameter when the wire length is long.
Refer to the table for the breaker specifi cations of each installation condition. Perform
the power crossover wiring within the range of the same refrigerant system. When the
crossover wiring is done, make a connection for indoor units to satisfy conditions A and B
below.
A. Current breaker requirements
Model
AUXB07GALH
AUXB09GALH
AUXB12GALH
AUXB14GALH
AUXB18GALH
AUXB24GALH
MCA: Minimum Circuit Ampacity
MFA: Maximum Fuse Ampacity
When the power crossover wiring is done, make it so that the total of the MCA of the
connected RB units and indoor units does not exceed the 15 A. For RB unit MCA, refer to
the RB unit installation manual.
If the capacity of connected RB units and indoor units exceeds the upper limit, either add
breakers or use a breaker with a greater capacity.
B. Earth leakage breaker requirements
Breaker capacity
30 mA, 0.1 sec or less
100 mA, 0.1 sec or less
* Heat pump type: indoor units, Heat recovery type: indoor units and RB units.
** If the total number of units connected to the breaker exceeds 44, either add a 30mA
breaker, or use breakers with a greater capacity.
6.1.1. Cable specifi cations
Recommended
cable size (mm
Power supply
2.5
cable
Transmission
0.33
cable
Remote
controller cable 0.33 to 1.25
(2-wire type)
Remote
controller cable 0.33
(3-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
*3
Breaker
Power supply Remote controller
(Master)
En-7
230 V
198 to 264 V
MCA MFA
0.20 A
0.20 A
0.24 A
20 A
0.29 A
0.30 A
0.75 A
* Maximum connectable "indoor units" or
"indoor units + RB units"
44 or less **
45 to 128
Cable type Remark
2
)
1ø 50 Hz 198 to 264 V
Type245 IEC57 or
2 Cable + earth
equivalent
(ground)
22 AWG LEVEL 4
(NEMA)
LONWORKS
non-polar 2 core,
compatible cable
twisted pair solid core
diameter 0.65 mm
Sheathed PVC
Non polar 2 core
cable*
Sheathed PVC
Polar 3 core
cable*
Indoor unit
*2 *2
*3
Breaker
Breaker
Remote controller
Remote controller
(Slave)
*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: When connecting the 2-wire type remote controller, Y3 is not used.
(Crossover wiring of 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.
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 screwdriver that is too small, otherwise, the screw heads may be
Indoor unit
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.
*3
(7) Please do not fi x 2 power supply cables with 1 screw.
Indoor unit
Indoor unit
Power supply
Pull box
20 mm
50 mm
Screw with
special washer
Cable end (Loop)
Terminal block
WARNING
Indoor unit
Power supply
Loop
Screw with
special washer
Cable end (Loop)
Cable