Electrical Requirement; Wiring Method; Unit Wiring - Fujitsu AIRSTAGE AUXD18GALH 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.
Breaker should be installed at every refrigerant system. Do not use a breaker in a different
refrigerant system.
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
AUXD18GALH
AUXD24GALH
AUXA18GALH
AUXA24GALH
AUXA30GALH
AUXA34GALH
AUXA36GALH
AUXA45GALH
AUXA54GALH
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
2
size (mm )
Power supply cable 2.5
Transmission cable 0.33
Remote controller
0.33 to 1.25
cable (2-wire type)
Remote controller
0.33
cable (3-wire type)
*: Use shielded cable in accordance with local rules for remote controller cables.
230 V
198 to 264 V (50 Hz)
198 to 253 V (60 Hz)
MCA MFA
0.32 A
0.38 A
0.46 A
0.46 A
20 A
0.51 A
0.61 A
0.64 A
0.83 A
0.94 A
* Maximum connectable "indoor units" or
"indoor units + RB units"
44 or less **
45 to 148
Cable type Remark
Type245 IEC57
2 Cable + earth (ground)
or equivalent
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* twisted pair
Sheathed PVC
Polar 3 core
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)
*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)
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
Earth (Ground)
cable
30 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 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
Screw with
special washer
Cable
Cable end (Loop)
Terminal block
Do not apply branch wiring. It may result electric shock or fi re.
Indoor unit Indoor unit
*2 *2
*3
Breaker Breaker
Remote controller
Remote controller
(Slave)
Indoor unit Indoor unit
Power supply
Pull box
20 mm
Loop
Screw with
special washer
Cable end (Loop)
Cable
*3
En-8