En-8
6. ELECTRICAL WIRING
]
WARNING
Electrical work must be performed in accordance with this Manual by a person
certi
fi
ed under the national or regional regulations. Be sure to use a dedicated circuit
for the unit. An insuf
fi
cient power supply circuit or improperly performed electrical work
can cause serious accidents such as electric shock or
fi
re.
Before starting work, check that power is not being supplied to the indoor unit and outdoor unit.
Use the included connection cables and power cables or ones specified by the
manufacturer. Improper connections, insuf
fi
cient insulation, or exceeding the allowable
current can cause electric shock or
fi
re.
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.
Improperly connected or secured cables can cause serious accidents such as
overheating the terminals, electric shock, or
fi
re.
Do not modify the power cables, use extension cables, or use any branches in the
wiring. Improper connections, insufficient insulation, or exceeding the allowable
current can cause electric shock or
fi
re.
Match the terminal board numbers and connection cable colors with those of the
outdoor 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
fi
re.
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
fi
re through exposure
to dust or water.
Install sleeves into any holes made in the walls for wiring. Otherwise, a short circuit
could result.
For U.S.A. and Canada :
When installing this system in high humidity locations, install using ground fault
equipment breakers (often referred to in other countries as an ELCB earth leakage
current breaker) to reduce the risk of leaking current which result in electric shock or
potential
fi
re.
For others:
Install an earth (ground) leakage breaker. In addition, install the earth (ground)
leakage breaker so that the entire AC main power supply is cut off at the same time.
Otherwise, electric shock or
fi
re could result.
Always connect the earth (ground) cable.
Improper earthing (grounding) 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
fi
rmly to the terminal board. Imperfect installation may
cause a
fi
re.
If the supply cord is damaged, it must be replaced by the manufacturer, its service
agent or similarly quali
fi
ed persons in order to avoid a hazard.
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 1-31/32 in. (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 indoor and outdoor units and peripheral devices.
• Cut power (breaker) off.
• Touch metal part of the indoor and outdoor 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.
1
6.1. Electrical requirement
Voltage rating
208/ 230 V
Operating range
187 to 253 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.
• 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.
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 cross-
over wiring is done, make a connection for indoor unit to satisfy conditions A and B below.
A. Current breaker requirements
Model
MCA
MOP (Fuse capacity)
ABUA30RLAV
0.52 A
20 A
ABUA36RLAV
0.66 A
MCA: Minimum Circuit Ampacity
MOP: Maximum Overcurrent Protection
When the power crossover wiring is done, make it so that the total of the MCA of the con-
nected indoor equipment does not exceed the 15 A.
B. Earth leakage breaker requirements
Breaker capacity
Maximum connectable indoor unit
30 mA, 0.1 sec or less
8
100 mA, 0.1 sec or less
27
200 mA, 0.1 sec or less
39 (Upper limit of the refrigerant system)
If the number of units of connected indoor unit exceeds the upper limit, either add break-
ers or use a breaker with large capacitance.
6.1.1. Transmission and remote controller wiring speci
fi
cations
Follow the speci
fi
cations below for the transmission and remote controller cable.
Cable size
Wire type
Remarks
Transmis-
sion cable
22 AWG
(0.33 mm²)
LEVEL 4 (NEMA)
non-polar 2core,
twisted pair solid
core diameter 1/32
in. (0.65mm)
LONWORKS
®
compatible cable
Remote control-
ler cable
22 AWG
(0.33 mm²)
Sheathed PVC cable Polar 3 core Twisted pair
]1
6.2. Wiring method
EXAMPLE
Outdoor unit
Transmission
Power supply
Power supply
Breaker 1
Indoor unit
Transmission
Power
supply
Remote
control
Transmission
Power
supply
Remote
control
Indoor unit
Transmission
Power
supply
Remote
control
Indoor unit
Power supply
Remote
controller
(Master)
Power supply
Remote
controller
(Slave)
Power supply
Remote
controller
Breaker
2
Breaker 1
Breaker
2
Breaker 1
Breaker
2
Breaker 1
Breaker
2
Breaker 1 : Earth leakage breaker
(GFCI breaker)
Breaker 2 : Current breaker
(MOP breaker)
(Crossover wiring of power supply)
Indoor unit
Indoor unit
Indoor unit
Power
supply
Remote
control
Power
supply
Remote
control
Power
supply
Remote
control
Pull box
Pull box
Breaker 1
Breaker
2
Power supply
Remote
controller
(Master)
Remote
controller
(Slave)
Remote
controller
9367702091-02_IM.indb En-8
9367702091-02_IM.indb En-8
12/29/2011 8:57:44 AM
12/29/2011 8:57:44 AM
