En-7
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 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.
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 indoor and outdoor units and peripheral devices.
• Cut power (breaker) off.
• Touch metal part of the indoor unit for more than 10 seconds to discharge static elec-
tricity charged in the body.
• Do not touch terminals of parts and patterns implemented on PCB.
6.1. Electrical requirement
CAUTION
Obtain the distribution network operator’s agreement about the power capacity of the
power supply system, speci
fi
cation of the cable and the harmonic current, and etc.
when you connect this unit with the power supply.
Voltage rating
230 V
Operating range
198 to 264 V (50 Hz)
198 to 253 V (60 Hz)
• 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.
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 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 indoor units to satisfy conditions A and B
below.
A. Current breaker requirements
Model
MCA
MFA
ARXC072GTEH
6.59 A
20A
ARXC090GTEH
6.97 A
ARXC096GTEH
9.02A
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 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.
B. Earth leakage breaker requirements
When the this unit is connected, select the earth leakage breaker based on the following
formula and table.
• 3 indoor units (including RB unit) = 1 this unit
Breaker capacity
* Maximum connectable “indoor units” or
“indoor units + RB units”
30 mA, 0.1 sec or less
44 or less
100 mA, 0.1 sec or less
45 to 148 **
* Heat pump type: indoor units, Heat recovery type: indoor units and RB units.
** If the 100 mA capacity breaker is not provided, split the quantity of the indoor units into
small groups of 44 units or less and provide a breaker with capacity of 30 mA for each
group.
Install the drain pipe
(1) Main drain
On the main drain, provide 1 trap near the indoor unit.
Trap
H2
H1
H1=100 mm (Approx.)
H2=50 to 100 mm
Unit
Drain pipe
(2) Safety drain
There is no need to provide a trap for the safety drain. If the safety drain is connected
to the main drain, make the connection below the main trap
.
Main
Safety
Drain pipe
Unit
• Make sure that drain pipe is installed without rises.
• Do not perform air bleeding.
Rise
Air bleeding
Rise
PROHIBITED
CAUTION
Be sure to properly insulate the drain pipes.
Make sure the drain water is properly drained.
6. ELECTRICAL WIRING
WARNING
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 manu-
facturer. Improper connections, insufficient 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 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.
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