Mitsubishi Heavy Industries FDC112KXEN6 Technical Manual page 192

Note (1) If the connector remains connected, drain water is discharged from the standard pipe connecting port, leading to water leakage.
Drainage test
When using the standard drain port, execute a drainage test after completion of
electric work.
1 During the test run, make sure that drain flows properly through the piping
and that no water leaks from connections.
2 Be sure to conduct this test even when the unit is installed in the heating
season.
3 In case of a new building, conduct the test before it is furnished with the
ceiling.
1) Inject about 1,000cc by using a feed water pump from the grommet on the drain pump side.
2) At the drain port (transparent portion), check if drainage is performed.
3) After completion of the drain test, completely perform heat insulation fot the drain pipe up to the indoor unit.
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.
Setup from a remote controller side.
Drain pump operation from a remote controller unit is possible. Operate a remote controller unit by following the steps described
below.
1. To start a forced drain pump operation
1 Press the TEST button for three seconds or longer.
The display will change from "
2 Press the button once while "
3 When the SET button is pressed, a drain pump operation will start.
Display:"DRAIN PUMP RUN"
2. To cancel a drain pump operation.
1 If either SET or ON/OFF button is pressed, a forced drain pump operation will stop.
The air conditioning system will become OFF.
SELECT ITEM" "
TEST RUN " is displayed, and cause "DRAIN PUMP
" STOP"
188
-
Clear flexible tubing (optional)
Natural drain port
Insert the tip of the supply water pump approximately
50 mm in a downward direction.
SET" " TEST RUN
-
Hard vinyl chloride piping.
General piping VP-20
Heat
insulation
Rubber plug
Remove
CNR (Blue·2P)
Control box
Piping penetration cover
"
" to be displayed.