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4.3.3 Pipe connection

When the flare nut is tightened properly by your hand, hold the body side coupling with a

separate spanner, then tighten with a torque wrench.

Be sure to install the pipe against the port on the indoor unit and the outdoor unit cor-

rectly. If the centering is improper, the flare nut cannot tightened smoothly. If the flare

nut is forced to turn, the threads will be damaged.

Do not remove the flare nut from the indoor unit pipe until immediately before connect-

ing the connection pipe.

Do not use mineral oil on flared part. Prevent mineral oil from getting into the system as

this would reduce the lifetime of the units.

Hold the torque wrench at its grip, keeping it at a right angle with the pipe, in order to

tighten the flare nut correctly.

Flare nut

Tightening torque

[in (mm)]

[lbf·ft (N·m)]

1/4 (6.35) dia.

11.8 to 13.3 (16 to 18)

3/8 (9.52) dia.

23.6 to 31.0 (32 to 42)

1/2 (12.70) dia.

36.1 to 45.0 (49 to 61)

5/8 (15.88) dia.

46.5 to 55.3 (63 to 75)

3/4 (19.05) dia.

66.4 to 81.1 (90 to 110)

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 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.

We suggest installing GFEB breakers or follow local electrical code. When installing

this system, install using ground fault equipment breakers (GFEB) to reduce the risk of

leaking current which result in electric shock or potential fire.

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

Tighten with 2 wrenches.

Flare

Torque

nut

wrench

Indoor unit pipe

Connection pipe

(Body side)

WARNING

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 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 2 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 units for more than 10 seconds to discharge static

electricity charged in the body.

Holding

• Do not touch terminals of parts and patterns implemented on PCB.

wrench

5.1. Electrical requirement

• 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.

A. Current breaker requirements

Model

MCA

ASUA4TLAV1

0.22 A

ASUA7TLAV1

0.32 A

ASUA9TLAV1

0.52 A

ASUB30TLAV1

0.90 A

ASUB36TLAV1

1.18 A

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

Breaker capacity

30 mA, 0.1 sec or less

100 mA, 0.1 sec or less

5.1.1 Cable speciﬁ cations

Transmission

22 AWG

cable

(0.33 mm²)

22 AWG to 16 AWG

Remote con-

(0.33 to 1.25 mm²)

troller cable

(2-wire type)

18AWG

CAUTION

Voltage rating

Operating range

• MCA: Minimum Circuit Ampacity

MAX. CKT. BKR

• MAX. CKT. BKR : Maximum Circuit

(Fuse capacity)

Breaker

When the power crossover wiring is

done, make it so that the total of the

15 A

MCA of the connected RB units and

indoor units does not exceed the 11 A.

For RB unit MCA, refer to the RB unit

installation manual.

*1: Heat pump type: indoor units,

Maximum connect-

Heat recovery type: indoor units

able "indoor units"

and RB units.

or "indoor units +

*2: If the 100 mA capacity breaker is

RB units" (*1)

not provided, split the quantity of

36 or less

the indoor units into small groups

of 9 units or less and provide a

37 to 121 (*2)

breaker with capacity of 30 mA for

each group.

Cable size

Cable type

LEVEL 4 (NEMA) non-polar

2 core, twisted pair solid core

diameter 0.026 in (0.65mm)

Sheathed PVC cable

Thermostat cable 2 core

208/230 V

187 to 253 V

Remarks

LONWORKS ®

compatible cable

Non polar 2 core,

twisted pair

Use sheathed non

twisted pair cable

En-6