Electrical Requirement; Wiring Method; Unit Wiring - Fujitsu AIRSTAGE ARUM24TLAV 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.
• Select the correct cable type and size according to the country or region's regulations.
• 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 MCA
ARUM24TLAV 1.10 A
ARUM30TLAV 1.40 A
ARUM36TLAV 1.74 A
MCA: Minimum Circuit Ampacity
MAX. CKT. BKR : Maximum Circuit Breaker
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 11 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. Ground Fault Equipment 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 36, either add a 30mA
breaker, or use breakers with a greater capacity.
6.1.1. Transmission and remote controller wiring specifi cations
Follow the specifi cations below for the transmission and remote controller cable.
Cable size
22 AWG
Transmission cable
(0.33 mm²)
Remote controller
22 AWG to 16 AWG
cable
(0.33 to 1.25 mm²)
(2-wire type)
Remote controller
22 AWG
cable
(0.33 mm²)
(3-wire type)

6.2. Wiring method

EXAMPLE
Outdoor unit or RB unit *1
Transmission
Indoor unit
Remote
Transmission
control
Power supply
*2
Breaker2
Breaker1
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: When connecting the 2-wire type remote controller, Y3 is not used.
En-9
208 / 230 V
187 to 253 V
MAX. CKT. BKR (Fuse capacity)
15 A
* Maximum connectable
"indoor units" or "indoor units + RB units"
36 or less **
37 to 90
Wire type Remarks
LEVEL 4 (NEMA)
non-polar 2core,
LONWORKS
twisted pair solid
compatible cable
core diameter
0.026 in. (0.65mm)
Sheathed PVC
Non polar 2 core
cable
Sheathed PVC Polar 3 core Twisted
cable pair
Breaker 1: Ground Fault Equipment
Breaker (GFEB)
Breaker 2: Maximum Circuit Breaker
(MAX. CKT. BKR)
Indoor unit
*2
Breaker2 Breaker2
Breaker1 Breaker1
Remote controller
(Slave)
(Crossover wiring of power supply)
Power supply
Pull box
Breaker2
Breaker1
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 fi gure
below.
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 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 1 in.
(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.
Indoor unit
(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.
*2
(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 fi x 2 power supply cables with 1 screw.
Remote
controller
Indoor unit Indoor unit
Power supply
Pull box
Power supply
2-3/4 in.
(70 mm)
2-3/4 in.
(70 mm)
Screw with
special washer
Cable end (Loop)
Terminal block
WARNING
Indoor unit
Power supply
: Disconnect switch
Conduit connector
Loop
Screw with
special washer
Cable end (Loop)
Cable