Wiring Method; Unit Wiring - Fujitsu AirStage AUUA4TLAV2 Installation Manual

A. Current breaker requirements
MAX. CKT. BKR
Model MCA
(Fuse capacity)
AUUA4TLAV2 0.29 A
AUUA7TLAV2 0.51 A
AUUA9TLAV2 0.51 A
AUUA12TLAV2 0.51 A
AUUA14TLAV2 0.51 A
AUUA18TLAV2 0.51 A
AUUA24TLAV2 0.78 A
B. Ground Fault Equipment Breaker requirements
Maximum connect-
able "indoor units"
Breaker capacity
or "indoor units +
RB units" (*1)
30 mA, 0.1 sec or less 36 or less
100 mA, 0.1 sec or less 37 to 121 (*2)
6.1.1. Cable specifications
Cable size
Use
(AWG)
LEVEL 4 (NEMA) non-polar 2 core,
Transmission
22 twisted pair solid core diameter
cable
0.026 in (0.65 mm)
22 to 16 Sheathed PVC cable
Remote con-
troller cable
(2-wire type)
18 Thermostat cable 2 core

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
Disconnect switch shall be installed between indoor unit and pull box.
En-7
• 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.
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.
*1: Heat pump type: indoor units,
Heat recovery type: indoor units
and RB units.
*2: If the 100 mA capacity breaker is
not provided, split the quantity of
the indoor units into small groups
of 36 units or less and provide a
breaker with capacity of 30 mA for
each group.
Cable type
LONWORKS®
compatible cable
Non polar 2 core,
twisted pair
Use sheathed non
twisted pair cable
Breaker 1: Ground Fault Equipment
Breaker (GFEB)
Breaker 2: Maximum Circuit Breaker
(MAX. CKT. BKR)
Indoor unit
Breaker 2 Breaker 2
Breaker 1 Breaker 1
*2
Remote controller
(Slave)
Indoor unit
Power supply Power supply
Pull box
: Disconnect switch
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 figure
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 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.
(4) 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 1 in
(25 mm)
Remarks
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 figure below to connect to
Indoor unit
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.
(5) 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.
(6) Do not tighten the terminal screws too much, otherwise, the screws may break.
(7) See the table for the terminal screw tightening torques.
(8) Please do not fix 2 power supply cables with 1 screw.
*2
Strip 3/8 in
Remote
(10 mm)
controller
Indoor unit
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)
Conduit connector
1-3/4 in (45 mm)
2-3/4 in (70 mm)
Screw with
special washer
Cable end (Loop)
Terminal block
WARNING
Ring terminal
Screw with
special washer
Ring terminal
Terminal block
WARNING
Tightening torque
11 to 16 lbf·in (1.2 to 1.8 N·m)
Loop
Screw with
special washer
Cable end (Loop)
Cable
Sleeve
Screw with
special washer
Ring terminal
Cable