Mitsubishi Heavy Industries FDC112KXEN6 Technical Manual Download

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181

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 heating.

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 supply 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..
* Be careful not to get splashed when pulling the drain plug.

Forced drain pump operation

In case electrical wiring work finished
Drain pump can be operated by remote controller (wired).
For the operation method, refer to Operation for drain pump in the installation manual for wiring work.

In case electrical wiring work not finished
Drain pump will run continuously when the dip switch “W7-1” on the indoor unit PCB is turned ON, the Connector CNB is
disconnected, and then the power supply (230VAC on the terminal block

and

) is turned ON.

Make sure to turn OFF “W7-1” and reconnect the Connector CNB after the test.

Put the tip of the feed water pump
in the drain pan of the unit body

Drain plug

3) Care must be taken so as not to allow an adhesive to run into the drain hose.

When it is hardened, it can cause a breakage of a flexible part, if the flexible
part receives stress.

4) Use VP-20 general-purpose hard PVC pipes for drain piping.
5) Insert the drain hose supplied as an accessory (soft PVC end) to the stepped

part of the unit’s drain socket and then fasten it with the clamp also supplied as
an accessory.

6) Adhesive must not be used.

a) Attach a VP-20 joint (to be procured locally) to joint it with the drain hose

(hard PVC end) and then attach a VP-20 (to be procured locally) to the joint.

b) Give the drain piping a descending grade (1/50-1/100) and never create a

bump to go over or a trap.

c) In connecting drain pipes, care must be taken so as not to apply force to the

unit side piping and fix the pipe at a point as close to the unit as possible.

d) Do not create an air vent under any circumstances.
e) When drain piping is implemented for more than one unit, provide a col-

lecting main about 100 mm below the units’ drain outlets from which it
collects drain. Use a VP-30 or larger pipe for a collecting main.

f) Do not fail to provide heat insulation at the following two points because they

can cause dew condensation and a resultant water leak.

7) Drain socket

After a drain test is completed, apply a pipe cover (small: accessory) onto the
drain socket, cover the pipe cover (small), the clamp and part of the drain hose
with a pipe cover (large: accessory) and wrap it with a tape completely without
leaving any gaps.
(Cut pipe covers into appropriate shapes)

8) Hard PVC pipes laid indoor

a) Since a drain pipe outlet can be raised up to 600 mm from the ceiling, use

elbows, etc. to install drain pipes, if there are obstacles preventing normal
drain pipe arrangement. When the drain pipe is raised at a point far from a
unit, it can cause an overflow due to a back flow of drain upon stoppage, so
arrange piping to keep the dimensions specified in the illustration shown on
the left.

b) Install the drain pipe outlet where no odor is likely to be generated.
c) Do not lead the drain pipe into a ditch where the generation of harmful gas

such as sulfuric gas or flammable gas is expected. A failure to observe this
instruction may cause such harmful or flammable gas to flow into the room.

Mitsubishi Heavy Industries FDC112KXEN6, Technical Manual

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