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Pipe outside diameter

[in. (mm)]

Dimension A [in. (mm)]

Dimension B [in. (mm)]

Flare tool for R410A,

clutch type

1/4 (6.35)

0 to 0.020

(0 to 0.5)

3/8 (9.1)

3/8 (9.52)

1/2 (13.2)

1/2 (12.70)

5/8 (16.6)

5/8 (15.88)

3/4 (19.7)

3/4 (19.05)

15/16 (24.0)

When using conventional

are tools to

are R410A pipes, the dimension A should be

approximately 0.020 in. (0.5 mm) more than indicated in the table (for

aring with R410A

flare tools) to achieve the specified flaring. Use a thickness gauge to measure the
dimension A.

Width across

flats

Pipe outside

diameter [in. (mm)]

Width across flats of

Flare nut [in. (mm)]

1/4 (6.35)

11/16 (17)

3/8 (9.52)

7/8 (22)

1/2 (12.70)

1 (26)

5/8 (15.88)

1-1/8 (29)

3/4 (19.05)

1-7/16 (36)

5.6.2. Bending pipes

• If pipes are shaped by hand, be careful not to collapse them.
• Do not bend the pipes in an angle more than 90°.
• When pipes are repeatedly bend or stretched, the material will harden, making it dif

cult

to bend or stretch them anymore.

• Do not bend or stretch the pipes more than 3 times.

CAUTION

• To prevent breaking of the pipe, avoid sharp bends.
• If the pipe is bent repeatedly at the same place, it will break.

5.6.3. Pipe connection

CAUTION

• Be sure to Install the pipe against the port on the indoor unit correctly. If the center-

ing is improper, the

are nut cannot tighten smoothly. If the

are nut is forced to

turn, the threads will be damaged.

• Do not remove the

are nut from the indoor unit pipe until immediately before con-

necting the connection pipe.

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

to tighten the

are nut correctly.

• Tighten the

are nuts with a torque wrench using the speci

ed tightening method.

Otherwise, the

are nuts could break after a prolonged period, causing refrigerant

to leak and generate hazardous gas if the refrigerant comes into contact with a

ame.

CAUTION

• Connect the piping so that the control box cover can easily be removed for servic-

ing when necessary.

• In order to prevent water from leaking into the control box, make sure that the pip-

ing is well insulated.

When the flare nut is tightened properly by your hand, hold the body side coupling with a
wrench, then tighten with a torque wrench. (See the table below for the flare nut tightening
torques.)

Tighten with two wrenches.

Holding wrench

Flare nut

Connection pipe

Torque wrench

Indoor unit pipe

(Body side)

Flare nut [in. (mm)]

Tightening torque [lb·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)

6. ELECTRICAL WIRING

Cable

Cable size

Remarks

Connection cable

14AWG UL 1505

3 cable+Earth (Ground),

208/230 V

Max. Cable Length: Limit voltage drop to less than 2%. Increase cable gauge if voltage drop is
2% or more.

6.1. Wiring system diagram

WARNING

Before connecting the wires, make sure the power supply is OFF.

Every wire must be connected

rmly.

No wire should be allowed to touch refrigerant tubing, the compressor or any moving
part.
Loose wiring may cause the terminal to overheat or result in unit malfunction. A

hazard may also exist. Therefore, be sure all wiring is tightly connected.
Connect wires to the matching numbers of terminals.

INDOOR UNIT SIDE

INDOOR UNIT

TERMINAL

DISCONNECT
SWITCH
(Locally purchased)

Power line

Control line

Earth

(ground) line

OUTDOOR UNIT

Connect it to

the speci