Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 137

⑥Drain pipe (continued)
Drain test
● After installation of drain pipe, make sure that drain system work in good condition and no
water leakage from joint and drain pan. Check if the motor sound of drain pump is normal
or not.
● Do drain test even if installation of heating season.
● For new building cases, make sure to complete the test
before hanging the ceiling.
1. Pour water of about 1000cc into the drain pan in the
indoor unit by pump so as not to get the electrical
component wet.
2. Make sure that water is drained out properly and there
is no water leakage from any joints of the drain pipe at
the test.
Confirm that the water is properly drained out while the
drain motor is operating. At the drain socket
(transparent), it is possible to check if the water is
drained out properly.
3. Unplug the drain plug on the indoor unit to remove
remaining water on the drain pan after the test, and re-plug
it. And insulate the drain pipe properly finally.
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"SW7-1" on the indoor unit PCB is turned ON, the Connec-
tor CNB is disconnected, and then the power supply (230VAC on the terminal block ① and ②) is turned ON.
Make sure to turn OFF "SW7-1" and reconnect the Connector CNB after the test.
⑦Wiring-out position and wiring connection
● Electrical installation work must be performed according to the installation manual by an
electrical installation service provider qualified by a power provider of the country, and be
executed according to the technical standards and other regulations applicable to electrical
installation in the country.
Be sure to use an exclusive circuit.
● Use specified cord, fasten the wiring to the terminal securely, and hold the cord securely in
order not to apply unexpected stress on the terminal.
● Do not put both power source line and signal line on the same route. It may cause miscommu-
nication and malfunction.
● Be sure to do D type earth work.
● For the details of electrical wiring work, see attached instruction manual for electrical wiring
work.
1. Remove a lid of the control box (3 screws) and
the wiring cover (2 screws).
2. Hold each wiring inside the unit and fasten
them to terminal block securely.
3. Fix the wiring with clamps.
4. Install the removed parts back to original place.
Single Split (PAC) series
Power source line clamp
Power source side
terminal block
Signal side terminal block
VRF (KX) series
Power source side
Power source
terminal block
line clamp
Signal side terminal block
Checking window
for draining
Drain plug
Power source line Signal line
Wiring cover
Wiring between indoor and outdoor unit
Earth
Remote Controller line
Signal line clamp
Earth
Indoor power source line
Signal line (Shielded cord)
Remote controller line
Signal line clamp
Earth (Signal line)
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⑧Panel installation
●Attach the panel on the indoor unit after electrical wiring work.
●Refer to attached manual for panel installation for details.
⑨Check list after installation
●Check the following items after all installation work completed.
Check if;
The indoor and outdoor units are fixed securely?
Inspection for leakage is done?
Insulation work is properly done?
Water is drained properly?
Supply voltage is same as mentioned in the model name plate?
There is mis-wiring or mis-connection of piping?
Earth wiring is connected properly?
Cable size comply with specified size?
Any obstacle blocks airflow on air inlet and outlet?
⑩How to check the dirt of drain pan (Maintenance)
The method of checking the dirt of drain pan
●It is possible to check the dirt for inlet of drain pan without detaching the panel.
（Inspection is not possible when the high efficient filter and option spacer is installed.)
１．Open the air return grille and remove the panel corner cover on drain pan side.
２．Remove the cover of inspection window. (1screw)
３．Check the drain pan from the inspection window.
If the drain pan is very dirty，remove the drain pan and clean it.
４．After checking of the dirty of drain pan, restore the cover of the inspection window
securely. Improper restoration of the cover may cause dew condensation and water
leakage.
Panel
Corner cover
Attention for removing drain pan
●The fixing components have been attached the with drain pan. Pay attention to these
components during installation and removing. Take off the hanging hook after removing
four screws. During the installation of drain pan, fix the drain pan firmly by using four screws
after hanging it up with the fixing hook.
Drain pan
Fixing piece
134
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(See next page)
Expected trouble
Falling, vibration, noise
Insufficient capacity
Water leakage
Water leakage
PCB burnt out, not working at all
PCB burnt out, not working at all
Electric shock
PCB burnt out, not working at all
Insufficient capacity
Available checking part
for inlet of drain pan.
Cover of
checking
window
Remove the screws
Rotate the hook
PJF012D007
Check
A