Electrical Requirement; Wiring Method; Unit Wiring - Fujitsu ARUV12TLAV 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.
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
ARUV12TLAV
ARUV18TLAV
ARUV24TLAV
ARUV30TLAV
ARUV36TLAV
ARUV48TLAV
ARUV60TLAV
MCA: Minimum Circuit Ampacity
MAX. CKT. BKR : Maximum Circuit Breaker
Breaker should be installed at every refrigerant system. Do not use a breaker in a different
refrigerant system.
With this model, connect only one indoor unit to a current breaker. (Crossover wiring is
prohibited.)
Select a minimum of 7 or more multiples of rated current under the condition time in seconds
10ms (0.01 S) or less at the current breaker trip curves (time in seconds/multiples of rated
current).
B. Ground Fault Equipment Breaker requirements
Breaker capacity
30 mA, 0.1 sec or less
100 mA, 0.1 sec or less
* Number of connected Heat pump type
** If the 100 mA capacity breaker is not provided, split the quantity of the indoor units into
small groups of 9 units or less and provide a breaker with capacity of 30 mA for each
group.
When connecting different models on the above listed breaker in conjunction with the
ARUV12/18/24/30/36/48/60TLAV, you might be able to connect more than 9 units. To
determine the maximum amount of indoor units when using different models or Heat
recovery type, reference each units Design and Technical Manual to calculate the total
amount of units that can be connected on a given breaker.
6.1.1. Transmission and remote controller wiring specifi cations
Follow the specifi cations below for the transmission and remote controller cable.
Cable size
Transmission 22 AWG
cable (0.33 mm²)
22 AWG to 16 AWG
Remote
(0.33 to 1.25 mm²)
controller cable
(2-wire type)
18 AWG
Remote
22 AWG
controller cable
(0.33 mm²)
(3-wire type)
En-7
208 / 230 V
187 to 253 V
MAX. CKT. BKR
MCA
(Fuse capacity)
1.75 A
2.14 A
2.81 A
3.38 A 15 A
4.45 A
5.24 A
6.98 A
* Maximum connectable indoor units
(ARUV12/18/24/30/36/48/60TLAV model only)
9 or less
10 to 30 **
Wire type Remarks
LEVEL 4 (NEMA)
non-polar 2core,
LONWORKS ®
twisted pair solid core
compatible cable
diameter 0.026 in
(0.65mm)
Non polar 2 core, twisted
Sheathed PVC cable
pair
Thermostat cable 2 Use sheathed non twisted
core pair cable
Sheathed PVC cable Polar 3 core

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.

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 and
table below.
Earth (Ground) wire
Model
ARUV12/18/24TLAV
ARUV30/36TLAV
ARUV48/60TLAV
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)
Screw with
special washer
Cable
Cable end (Loop)
Terminal block
Breaker 1: Ground Fault Equipment
Breaker (GFEB)
Breaker 2: Maximum Circuit Breaker
(MAX. CKT. BKR)
Indoor unit
*2
Breaker2
Breaker2
Breaker1 Breaker1
Remote controller Remote controller
(Slave)
Conduit connector
(1)
(2)
(1): [in (mm)] (2): [in (mm)]
5-1/2 (140) 6-11/16 (170)
7-7/8 (200) 9-1/16 (230)
9-7/16 (240) 10-5/8 (270)
Loop
Screw with
special washer
Cable end
(Loop)
Cable
Indoor unit
*2