Mitsubishi Heavy Industries FDC112KXEN6 Technical Manual page 202

5) Be sure to provide heat insulation to hard PVC pipes of indoor placement.
6) Do not ever provide an air vent.
7) The height of the drain head may be elevated up to a point 600mm above the ceiling and, when an obstacle exists in the
ceiling space, elevate the piping to avoid the obstacle using an elbow or corresponding gadget. When doing this, if the
stretch for the needed height is too high, the back-fiow quantity of drain at the time 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 drawing 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.
(v) Drain test (Perform the drain test after the electrical wiring work has been finished.)
● Check that water is draining thoroughly during the test run, and that there are no water leaks from the joints.
● The test has to be performed even if the unit is installed in a season when the unit is used for heating.
● In a new house, perform the test before the ceiling is fitted.
Remove grommet
Make sure to in stall
it back after test.
Pull in the water pump hose approximately
50 mm with its end facing down.
Indoor unit
Water drainage may be checked
through the translucent socket.
Forced drain pump operation
Setup from a unit side.
q 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.
w 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 q and w) is turned ON.
Make sure to turn OFF "W7-1" and reconnect the Connector CNB after the test.
295~325
Drain hose (accessory)
1) Remove the grommet, and using a water pump, pour about
Piping
through cover
2) Check the drain-out section (transparent section) for nor-
3) Take off the drain plug to release the water. After water
Drain hose
4) After the drain test, thoroughly insulate the drain pipe,
198
- -
100 or less
Joints for VP-25 (field procurement)
1000cc of water, from the position shown in the left fig-
ure.
Caution
When pouring water, be sure to perform the drain pump
forced operation.
mal flow of drainage.
release has been confirmed, replace the drain plug as it
was.
* Be careful not to get splashed when pulling the drain
plug.
up to the main unit.
Unit : mm