En-8
CAUTION
Earth (Ground) the unit.
Do not connect the earth (ground) cable to a gas pipe, water pipe, lightning rod, or a
telephone earth (ground) cable.
Improper earthing (grounding) may cause electric shock.
Do not connect power supply cables to the transmission or remote controller terminals,
as this will damage the product.
Never bundle the power supply cable and transmission cable, remote controller cable
together.
Separate these cable by 50 mm or more.
Bundling these cables together will cause miss operation or breakdown.
When handling PCB, static electricity charged in the body may cause malfunction of
the PCB. Follow the cautions below:
• Establish an earth (ground) for the DX-kit and outdoor units and peripheral devices.
• Cut power (breaker) off.
• Touch metal part of the DX-kit for more than 10 seconds to discharge static
electricity charged in the body.
• Do not touch terminals of parts and patterns implemented on PCB.
7.1. Electrical requirement
• The following breaker speci
fi
cations apply only to connections for Fujitsu general indoor
units, RB units, and DX-kits.
• Do not simultaneously connect Fujitsu general devices and non-Fujitsu general devices
to the same breaker. In using non-Fujitsu general devices, follow the speci
fi
cations for
that device.
Voltage rating
230 V
Operating range
198 to 264 V
• Select the power cable type and size in accordance with relevant local and national
regulations.
• Speci
fi
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 speci
fi
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 DX-kits to satisfy conditions A and B
below.
A. Current breaker requirements
Model
MCA
MFA
UTY-VDGX
0.096 A
20 A
MCA: Minimum Circuit Ampacity
MFA: Main Fuse Ampacity
When the power crossover wiring is done, make it so that the total of the MCA of the
connected DX-kits ,RB units ,and indoor units does not exceed the 15 A. For indoor unit
MCA and RB unit MCA, refer to the indoor unit and RB unit installation manual.
If the capacity of connected DX-kits ,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
* Maximum connectable DX-kits, “indoor
units + DX-kits”, or “indoor units + RB
units + DX-kits”
30 mA, 0.1 sec or less
44 or less **
100 mA, 0.1 sec or less
45 to 128
* 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.
7.1.1. Cable speci
fi
cations
For cable selections, see the "Connection of wiring" chapter below.
7.2. Wiring method
EXAMPLE
Outdoor unit or RB unit *1
DX-kit (Control unit)
Transmission
X1,X2: Transmission
Y1,Y2,Y3: Remote controller
External interface
terminal *3
Indoor unit
Remote
controller
Remote controller
Power supply
Power supply
Power supply
Breaker
Breaker
*2
*2
*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.
*3: For the external interface terminal, refer to "7.4. Connection of wiring".
(Crossover wiring of power supply)
Breaker
DX-kit (Control unit)
Power supply
Pull box
Pull box
Power supply
Power supply
Power supply
Indoor unit
Indoor unit
7.3. Unit wiring
• Before attaching the cable to terminal block.
7.3.1. Power supply cable and Drain pump signal cable
Adjust the length of power supply cable to avoid excessive tension with referring
fi
gure
below.
Power supply cable
Earth (Ground)
cable
20 mm
30 mm
Drain pump signal cable
Decide the peeling length of the covering for the drain pump signal cable according to the
conditions for connecting to the terminal.
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