Electrical Wiring; Electrical Requirement; Wiring Method - Fujitsu AS A004HCAH Series Installation Manual

Vrf system indoor unit (wall mounted type)
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5. ELECTRICAL WIRING

Electrical work must be performed in accordance with this manual by a person certified
under the national or regional regulations. Be sure to use a dedicated circuit for the unit.
An insufficient power supply circuit or improperly performed electrical work can cause
serious accidents such as electric shock or fire.
Before starting work, check that power is not being supplied to the all units.
Use the included connection cables and power cables or ones specified by the
manufacturer. Improper connections, insufficient electrical insulation, or exceeding the
allowable current can cause electric shock or fire.
For wiring, use the prescribed type of cables, connect them securely, making sure that
there are no external forces of the cables applied to the terminal connections. Improp-
erly connected or secured cables can cause serious accidents such as overheating the
terminals, electric shock, or fire.
Do not modify the power cables, use extension cables, or use any branches in the wir-
ing. Improper connections, insufficient electrical insulation, or exceeding the allowable
current can cause electric shock or fire.
Match the terminal board numbers and connection cable colors with those of the out-
door unit (or RB unit). Erroneous wiring may cause burning of the electric parts.
Securely connect the connection cables to the terminal board. In addition, secure the
cables with wiring holders. Improper connections, either in the wiring or at the ends of
the wiring, can cause a malfunction, electric shock, or fire.
Always fasten the outside covering of the connection cable with the cable clamp. (If the
insulator is chafed, electric discharge may occur.)
Securely install the electrical box cover on the unit. An improperly installed electrical box
cover can cause serious accidents such as electric shock or fire through exposure to
dust or water.
Install sleeves into any holes made in the walls for wiring. Otherwise, a short circuit
could result.
Install an earth leakage breaker. In addition, install the earth leakage breaker so that the
entire AC main power supply is cut off at the same time. Otherwise, electric shock or fire
could result.
Always connect the ground (earth) cable.
Improper grounding (earthing) work can cause electric shocks.
Install the remote controller cables so as not to be direct touched with your hand.
Perform wiring work in accordance with standards so that the air conditioner can be
operated safely and positively.
Connect the connection cable firmly to the terminal board. Imperfect installation may
cause a fire.
If the supply cable is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualified persons in order to avoid a hazard.
Ground (earth) the unit.
Do not connect the ground (earth) cable to a gas pipe, water pipe, lightning rod, or a
telephone ground (earth) cable.
Improper grounding (earthing) may cause electric shock.
Do not connect power supply cable 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 ground (earth) for the indoor and outdoor units and peripheral devices.
• Cut power (breaker) off.
• Touch metal part of the indoor units for more than 10 seconds to discharge static
electricity charged in the body.
• Do not touch terminals of parts and patterns implemented on PCB.

5.1. Electrical requirement

Voltage rating
Operating range
• Select the power cable type and size in accordance with relevant local and national
regulations.
• Specifications 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 specifications 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.
En-7
WARNING
CAUTION
230 V
198 to 264 V
A. Current breaker requirements
Model
MCA
MFA
AS*A004HCAH
0.15 A
AS*A005HCAH
0.15 A
AS*A007HCAH
0.20 A
AS*A009HCAH
0.23 A
AS*A012HCAH
0.27 A
AS*A014HCAH
0.34 A
20 A
AS*E004HCAH
0.15 A
AS*E005HCAH
0.15 A
AS*E007HCAH
0.20 A
AS*E009HCAH
0.23 A
AS*E012HCAH
0.27 A
AS*E014HCAH
0.34 A
B. Earth leakage breaker requirements
Maximum connect-
able "indoor units"
Breaker capacity
or "indoor units +
RB units" (*1)
30 mA, 0.1 s or less
44 or less (*2)
100 mA, 0.1 s or less
45 to 148
5.1.1 Cable specifi cations
Recommended
cable size (mm²)
Power supply cable
2.5
Transmission cable
0.33
Remote controller
0.33 to 1.25
cable (2-wire type)
*1: Use shielded cable in accordance with local rules for remote controller cable.

5.2. Wiring method

Example
Outdoor unit or RB unit (*1)
Transmission
Indoor unit
Transmission
Power supply
Remote
control
(*2)
(*3)
Breaker
Remote controller
Power supply
(primary)
*1: When connecting to the Heat Recovery System, refer to the installation manual of the
RB unit.
*2: Ground (earth) the remote controller if it has an ground (earth) cable.
*3: The 3-wire type remote controller is not used.
(Crossover wiring of power supply)
Indoor unit
Power supply
Pull box
Breaker
Power supply
• 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.
*1: Heat pump type: indoor units,
Heat recovery type: indoor units
and RB units.
*2: If the total number of units con-
nected to the breaker exceeds 44,
either add a 30mA breaker, or use
breakers with a greater capacity.
Cable type
Remark
Type 60245 IEC
2 Cable + ground (earth)
57 or equivalent
LONWORKS
22 AWG LEVEL 4 (NEMA)
compatible
nonpolar 2 core, twisted pair
cable
solid core diameter 0.65 mm
Sheathed PVC
Nonpolar 2 core, twisted
cable *1
pair
Indoor unit
Indoor unit
(*2)
(*2)
(*3)
(*3)
Breaker
Remote controller
Remote controller
(secondary)
Indoor unit
Power supply
Power supply
Pull box
Breaker
Indoor unit

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