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4.3.2. 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

difﬁ cult to bend or stretch them any more.

•

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

To prevent breaking of the pipe, avoid sharp bends.

If the pipe is bent repeatedly at the same place, it will break.

4.3.3. Pipe connection

Be sure to install the pipe against the port on the indoor unit correctly. If the centering

is improper, the ﬂ are nut cannot tighten smoothly. If the ﬂ are nut is forced to turn, the

threads will be damaged.

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

connecting the connection pipe.

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

tighten the ﬂ are nut correctly.

Tighten the flare nuts with a torque wrench using the specified tightening method.

Otherwise, the ﬂ are nuts could break after a prolonged period, causing refrigerant to

leak and generate hazardous gas if the refrigerant comes into contact with a ﬂ ame.

Connect the piping so that the control box cover can easily be removed for servicing

when necessary.

In order to prevent water from leaking into the control box, make sure that the piping is

well insulated.

When the ﬂ are nut is tightened properly by your hand, hold the body side coupling with

a separate spanner, then tighten with a torque wrench. (See the table below for the ﬂ are

nut tightening torques.)

Torque wrench

Indoor unit pipe

(Body side)

Flare nut [in. (mm)]

1/4 (6.35) dia.

3/8 (9.52) dia.

1/2 (12.70) dia.

5/8 (15.88) dia.

3/4 (19.05) dia.

4.4. Installing heat insulation

Install the heat insulation material after performing a refrigerant leak check (see the In-

stallation Manual for the outdoor unit for details).

4.4.1. COUPLER HEAT INSULATION

• Insulate by the coupler heat insulation (Accessories) around the gas pipe and liquid

pipe of indoor side.

• After installing the coupler heat insulation, wrap both end with vinyl tape so that there

is no gap.

• After afﬁ xing the coupler heat insulation, secure it with 2 binders (large), one on each

end of the insulation.

• Make sure that the binders overlap the heat insulation pipe.

Coupler heat

insulation

(Accessories)

Binder (Large)

(Accessories)

After checking for gas leaks (refer to the Installation Manual of the outdoor unit),

perform this section.

Install heat insulation around both the large (gas) and small (liquid) pipes. Failure to

do so may cause water leaks.

CAUTION

Tighten with 2 wrenches.

Holding wrench

Flare nut

Connection pipe

Tightening torque [lbf·ft. (N·m)]

11.8 to 13.3 (16 to 18)

23.6 to 31.0 (32 to 42)

36.1 to 45.0 (49 to 61)

46.5 to 55.3 (63 to 75)

66.4 to 81.1 (90 to 110)

Cover this portion with

heat insulation.

Heat insulation

CAUTION

5. INSTALLING DRAIN PIPES

Do not insert the drain piping into the sewer where sulfurous gas occurs. (Heat

exchange erosion may occur)

Insulate the parts properly so that water will not drip from the connection parts.

Check for proper drainage after the construction by using the visible portion of

transparent drain port and the drain piping ﬁ nal outlet on the body.

Do not apply adhesive agent on the drain port of the body.

(Use the attached drain hose and connect the drain piping)

5.1A. When drain pump is used

• Use general hard polyvinyl chloride pipe ø 3/4 in. (19 mm) [I.D.], ø 1-1/16 in.(27 mm)

[O.D.] .

• Do not perform a rise, trap and air bleeding.

• Provide a downward gradient (1/100 or more).

• Provide supporters when long pipes are installed.

• Use an insulation material as needed, to prevent the pipes from freezing.

• Install the pipes in a way that allows for the removal of the control box.

Locally arranged pipe

Max.11-13/16 in.

(300 mm)

Observe the following procedures to construct centralized drain pipe ﬁ ttings.

[O.D.1-5/16 in.(33 mm)] or more

27-9/16 in.

(700 mm)or less

WARNING

CAUTION

Gap of 5' to 6' 6" (1.5 to 2 m)

Supporter

[O.D.1-1/16 in.

(27 mm)] or more

27-9/16 in.

(700 mm) or less

Horizontal or

upward gradient

Good

Rise

Air bleeding

Trap

Prohibited

Downward gradient 1/100 or more

En-8