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Refrigerant is charged to the outdoor unit. For details, see the
manual for installation work of outdoor unit. (Additional
charging, etc.)

1. Brazing for piping.

a. Execute brazing before tightening the flare nut.
b. Brazing must be executed while blowing nitrogen gas.

(This prevents generation of oxidized scale in copper
pipe.)

2. When there is a lot of brazings for long piping, install a

strainer midway of the piping. (The strainer is locally
supplied.)

3. Use clean copper pipe with inner wall surface free from

mist and dust. Blow nitrogen gas or air to blow off dust in
the pipe before connection.

4. Form the piping according to its routing. Avoid bending

and bending back the same piping point more than three
times.
(This will result in hardening of the pipe).

5. After deforming the pipe, align centers of the union fitting

of the indoor unit and the piping, and tighten them firmly
with wrenches.

6. Connect pipe to the service valve or ball valve which is

located below the outdoor unit.

7. After completed the piping connection, be sure to check if

there is gas leakage in indoor and outdoor connection.

After completing the piping connection, execute vacuum drying for the connecting piping and the indoor unit.
The vacuum drying must be carried out by using the service ports of both the liquid and gas side valves.

POSITIONS OF AIR CONDITIONER BODY AND CEILING SURFACE

Use two wrenches and tighten with regular torque.

Flare nut fastening torque N·m (kgf·cm)

ø6.35 mm

18 (180)

ø12.7 mm

55 (560)

ø19.05 mm

100 (1020)

ø9.52 mm

42 (430)

ø15.88 mm

65 (660)

Liquid size piping

Gas side piping

ø6.35 mm (1/4”)

ø12.7 mm (1/2”)

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• During drain piping connection, be careful not to exert extra force on the drain port at the indoor unit.
• The outside diameter of the drain connection at the indoor unit is 32mm.

• Be sure to perform heat insulation on the drain piping.

• Drain piping must have down-slope (1/50 to 1/100); be sure not to provide up-and-down slope to prevent reversal flow.
• Be sure to check no air trap on drain hose and to ensure smooth water flow and no abnormal sound.

• The height of drain may be possible up to 750 mm.

• When drain set piping, install as shown in the figure below.

• Connect the main drain pipe to exterior and leave it provisionally until the test comes to an end.
• Feed water to the flexible drain hose and check the piping for leakage.
• Be sure to check the drain up motor for normal operating and noise when electric wiring is complete.
• When the test is complete, connect the flexible drain hose to the drain port.
• Pour about 600-700cc of water in the drain pan of the indoor unit. (Pour from the position specified in the drawing by using a

water supply bottle or other suitable tool.)

• Press the drain pump test run on pcb to start the drain motor, and verity water drainage.

(The drain motor will automatically stop after operating for about five minutes.)

Piping material: Polyvinyl chloride pipe VP-25 and pipe fittings.

Heat insulation material: Polyvinylene foam with thickness more than 8 mm (local supply).

The air conditioner uses a drain up motor to drain water. Use the following procedure to test the drain up motor operation.

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1. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over 120

°C).

2. Precautions in high humidity circumstance.

This air conditioner has been tested according to the “JIS Standard Conditions with Mist” and have been confirmed that there
are no faults. However, if it is operated for a long time in high humid atmosphere (dew point temperature: more than 23

°C),

water drops are liable to fall. In this case, add heat insulation material according to the following procedure:

• Heat insulation material to be prepared... Adiabatic glass wool with thickness 10 to 20 mm.
• Stick glass wool on all air conditioners that are located in ceiling atmosphere.
• In addition to the normal heat insulation (thickness: more than 8 mm) for refrigerant piping (gas piping: thick piping) and drain

piping, add a further of 10 mm to 30 mm thickness material.

• When the outdoor unit is installed on a higher position than

the indoor unit, install the trap so as not to instill rain water
into the wall by transmitting in piping.

• Stuff the space among piping, the electric wire, and the drain

hose with “Putty” and seal the penetration wall hole.
Make sure that rain water do not instill into the wall.

Be sure to perform heat insulation on the drain, liquid and gas piping. Imperfection in heat insulation work leads
to water leakage.

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• Remove the mounting screw, remove the control box cover,

and then connect the wires by following the procedure given
in the illustration.

Earth lead wire shall be longer than other wires as shown in
the figure for the electrical safety in case of the slipping out of
the cord from anchorage.

1. Remove the air inlet grille by moving the catchers to center.

2. Fitting the decorative panel

• Temporarily secure the fixing screws (3 pcs.) before

fitting the decorative panel. (For temporarily securing the
front grille.)

• Place decorative panel on the screws (3 pcs.) before

fitting, move decorative panel as illustrated and tighten
all the screws (4 pcs.).

The decorative panel has its installation direction. Confirm the direction by displaying the piping side.