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2) When connecting the drain pipe to unit, pay sufficient attention not to applay excess force to the piping on the unit side.

Also, fix the piping at a point as close as possible to the unit.

3) For drain pipe, use hard PVC general purpose pipe VP-25(I.D.1”)

which can be purchased locally. When connecting, insert a PVC pipe
end securely into the drain socket before tightening securely using
the attached drain hose and clamp. Adhesive must not be used con-
nection of the drain socket and drain hose (accessory).

4) When consturcting drain piping for several units, position the com-

mon pipe about 100 mm below the drain outlet of each unit as shown
in the sketch. Use VP-30(11/4”) or thicker pipe for this purpes.

5) Be sure to provide heat insulation to hard PVC pipes of indoor place-

ment.

6) Do not ever provide an air vent.
7) The height of the drain head can be elevated up to a point 700 mm

ablve the ceiling and, when an obstacle exisits in the ceiling space,
elevate the piping to avoid the obstacle using an elbow or correspond-
ing gadget. When doing this, if the stretch for the needed height is
too high, the back-flow quantity of drain at the event of interruption
of the operation gets too much and it may cause overflow at the drain
pan. Therefore, make the height of the drain pipe within the distance
given in the sketeh below.

8) Avoid positioning the drain piping outlet at a place where generation

of odor may be stimulated. Do not lead the drain piping direct into a
sewer from where sulfur gas may generate.

9) The purpose of drain hose is to absorb minute discrepancy of the unit

or the drain piping occurred when they are installed. Therefore, when
it is bent intentionally or used under expanded condition, it may be
damaged and result in water leakage.’

Drainage test

Check that water is draining thoroghly during test run, and that there are no water leaks from the joints and the drain pan.

The test has to be performed even if the unit is installed in the season when the unit is used for healting.

In a new house, perform the test before the ceiling is fitted.
• Using a water pump, pour about 1000 cc of water to the drain pan through

the blowing outlet.

• Check the transparent drain-out section of the drain hose for normal flow

of drainage.
* While observing the noise from the drain motor, test drain operation.

• Take off the drain plug to release the water. After the water is drained, place

the drain pulg back where it was..
* While observing the noise from the drain motor, test drain operation.

Forced drain pump operation

Set up from a unit side.

Turn power on after selecting the emergency operation mode with a setting on the indoor unit board (SW9-3 ON) and discon-
necting the CnB connector on the board. Then, the drain pump will start a continuous operation 15 seconds later.
(Note: The blower will also start operation in tandem)

When a drain test is completed, reinstate the setting to cancel the emergency operation mode (SW9-3 OFF) and plug in the
CnB connector on the board.
(When electrical work is not completed, connect a convex joint to the drain pipe joint area, arrange an inlet and check leaks and
drain connections of the pipe)

Secure the elevation as high as possible
(approx. 100 mm)

VP30

VP25 joint
(field purchased)

A downhill grade of
1/100 or more

295 ~ 325 mm

100 mm or less

Drain hose

700 mm or less

(d)

Drain Piping

1) Drain piping should always be in downhili grade (1/50 ~ 1/100) and avoid riding across and elevation or making traps.

1.5 m ~ 2 m