Daikin FTK18NMVJU User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Indoor Unit
Inverter
Wall Mounted Type
15000/18000/24000 Btu/h Class
Si041553EB

Service Manual
Removal Procedure
Indoor Unit
zCooling Only zHeat Pump
FTK18NMVJU FTX15NMVJU
FTK24NMVJU FTX18NMVJU
FTKN18NMVJU FTX24NMVJU
FTKN24NMVJU FTXN18NMVJU
FTXN24NMVJU
FTK24P5VL
FTX24N5VL
FTH24P5VL

Si041553EB
Removal Procedure 1
Table of Contents
1. Air Filters .................................................................................................2
2. Front Panel..............................................................................................3
3. Front Grille ..............................................................................................4
4. Horizontal Blades ....................................................................................5
5. Electrical Box / Swing Motor ...................................................................6
6. PCBs .....................................................................................................10
7. Indoor Heat Exchanger .........................................................................13
8. Fan Rotor / Fan Motor...........................................................................16
9. Fan Guards / Vertical Blade ASSYs......................................................18
Note: The illustrations may be slightly different depending on the model.

Air Filters Si041553EB
2Removal Procedure
1. Air Filters
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1. Remove the air filters. The air filter is not marked
for difference between the
right and left sides.
The air filter can be set
easily by inserting it along
the guides.
Insert the air filter with the
“FRONT” mark faced up.
Be sure to insert the 2 lower
hooks when installing the air
filter.
1
2
3
Open the front panel.
Unfasten the 2 hooks
and pull out the air filter
downward to remove it.
Remove the other air
filter in the same way.
2. Remove the optional
filters.
The right and left filters are
interchangeable.
1 Remove the optional
filter ASSY by
unfastening the 4
projections from the
back of the air filter
frame.
2
3
Unfasten the 5 hooks
and remove the
optional filter from its
frame.
Remove the other
optional filter in the
same way.
Front panel
Air filterHook
(R21491)
Optional filter ASSY
Projection
(R21492)
Optional filter
frame
Optional
filter
Hook
Hook
(R24270)

Si041553EB Front Panel
Removal Procedure 3
2. Front Panel
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1 Release the left and
right shafts.
2 Remove the front panel. When reassembling the front
panel, fit the right and left
shafts one by one into the
grooves and fully push them
in position.
Left Shaft
(R24362)
Right Shaft
(R24285)
Front panel
(R21496)

Front Grille Si041553EB
4Removal Procedure
3. Front Grille
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1 Remove the 3 screws
of the front grille.
2
3
Unfasten the 3 hooks at
the top.
Pull out the upper part
of the front grille, lift up
the lower part, and then
remove the front grille.
The convex marks (…) on
the front panel indicate the
position of the hooks.
When reassembling, make
sure that all the 3 hooks are
fastened.
Front grille
(R21497)
Hook
(R21498)
(R12715)

Si041553EB Horizontal Blades
Removal Procedure 5
4. Horizontal Blades
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1 Release the center
shafts of the upper
horizontal blade while
bending the blade
slightly.
2
3
Release the left shaft.
Release the right shaft.
4 Remove the upper
horizontal blade.
Installation procedure
1. Fit the right shaft of the
horizontal blade first. Make
sure to rotate the horizontal
blade so the shaft fits in the
correct position.
2. Fit the horizontal blade to the
center and left shafts.
When reassembling, install
the lower horizontal blade
first.
5 Remove the lower
horizontal blade in the
same way.
Upper horizontal blade
Center shaft
(R21499)
Shaft
Left
(R21008)
Shaft
Right
(R24271)
Upper horizontal blade (R21500)
Lower horizontal blade (R21501)

Electrical Box / Swing Motor Si041553EB
6Removal Procedure
5. Electrical Box / Swing Motor
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1. Disconnect the
connecting wire.
The service cover can be
removed without removing
the front grille.
The service cover has no
hook and may fall when the
screw is loosened. Be
careful not to drop the
service cover.
1 Remove the screw, and
then the service cover.
2
3
4
Remove the screw, and
then the wire fixture.
Remove the screw, and
then the conduit holding
the connecting wire.
Remove the 4 screws
of the terminal board
and disconnect the
connecting wire.
Conduit is only for U.S.
models.
2. Remove the electrical
box.
When reassembling, be sure
to insert the earth/ground
wires in the front slit and
green/yellow wire is above
the green wire.
When reassembling, make
sure to pass the green earth/
ground wire behind the heat
exchanger tube (the tube
with the thermistor).
1
2
Remove the 2 screws
and detach the earth/
ground wires.
Release the earth/
ground wires from the
front slit at the top of the
electrical box.
Service cover
(R21502)
Wire fixture Conduit
Terminal board
Connecting
wire
(R21503)
Electrical
box
Front slit
Earth/ground wire (green/yellow)
Earth/ground wire (green) (R24272) Green/yellow
Green
(R24275)

Si041553EB Electrical Box / Swing Motor
Removal Procedure 7
3 Pull out the indoor heat
exchanger thermistor.
Be careful not to lose the clip
of the thermistor.
When reassembling, pass
the indoor heat exchanger
thermistor behind the green
earth/ground wire.
4 Release the thermistor
harness from the slit at
the top of the electrical
box.
5 Unfasten the 4 hooks
and remove the
electrical box cover.
When reassembling, make
sure the 4 hooks are
securely fastened.
Step Procedure Points
Indoor heat
exchanger
thermistor
(R21505)
Clip
(R11268)
Thermistor harness Electrical box
Thermistor
harness
Slit
(R24273)
Electrical box
cover
Hook
Hook
Hook
(R21508)
When reassembling, be
sure to insert the thermistor
harness in the slit as shown
in the picture.

Electrical Box / Swing Motor Si041553EB
8Removal Procedure
6
7
Disconnect the
connector [S200].
Release the harnesses
from the 4 hooks and
the groove.
[S200]: fan motor
8
9
Disconnect the
connector [S6].
Release the harnesses
from the 2 hooks and
from the groove.
[S6]: swing motor
10 Remove the screw of
the electrical box.
Step Procedure Points
Hook Hook
[S200]
Groove
Right view
(R24363)
Hook
[S6]
Groove
(R21510)
Electrical
box
(R22754)

Si041553EB Electrical Box / Swing Motor
Removal Procedure 9
11
12
Unfasten the hook at
the front, then slightly
lift the electrical box
upward.
Remove the electrical
box.
When reassembling, make
sure that the 2 hooks are
securely fastened to the
bottom frame.
3. Remove the swing motor.
1 Remove the screw, and
then the swing motor.
Step Procedure Points
Hook
(R21522)
Hook
Hook
Bottom frame
(R21523)
Swing motor
(R21032)

PCBs Si041553EB
10 Removal Procedure
6. PCBs
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1. Remove the control PCB.
1 Disconnect all the 4
terminals.
2
3
Release the 2 earth/
ground wires and the
thermistor harness from
the groove.
Disconnect the
connector [S32] and
release the thermistor
harness from the slit.
[S32]: indoor heat exchanger
thermistor
When reassembling, make
sure to insert the earth/
ground wires back into the
groove.
When reassembling, make
sure to insert the thermistor
harness back into the groove
and the slit.
4
5
6
Disconnect the
connector [S900].
Disconnect the
connector [S26].
Release the harness of
[S26] from the 4 hooks
and the groove.
[S900]: filter PCB
[S26]: display PCB
Black Earth/ground wire
Red
White
(R24186)
Black White Red
Earth/ground wire
1234
FRONT
(R24287)
[S32]Thermistor harness
Filter PCB
Control PCB
Slit
Groove Earth/ground wire
(green/yellow) (green)
(R24288)
[S900]
[S26]
Groove Hook (R21514)

Si041553EB PCBs
Removal Procedure 11
7 Unfasten the 5 hooks
and remove the control
PCB.
When reassembling, fit the
control PCB to the 3
projections.
2. Remove the filter PCB. [S100]: terminal board
1 Disconnect the
connector [S100].
2 Unfasten the 4 hooks
and remove the filter
PCB.
Step Procedure Points
Hook
Hook
(R21515)
Projections
Control PCB
(R24274)
[S100]
(R21517)
Hook
Hook
Filter PCB
(R22756)

PCBs Si041553EB
12 Removal Procedure
3. Remove the display PCB.
1 Release the harness of
the signal receiver unit
from the 3 hooks.
2 Unfasten the 2 hooks of
the signal receiver unit.
When reassembling, make
sure to fit the bottom of the
signal receiver unit before
fastening the 2 hooks.
3
4
Turn over the signal
receiver unit.
Unfasten the 3 hooks
and remove the display
PCB.
Step Procedure Points
Hook
Signal receiver unit
Left view
(R24364)
Hook
Signal receiver unit (R21520)
Back view
Hook
Display PCB
(R24365)

Si041553EB Indoor Heat Exchanger
Removal Procedure 13
7. Indoor Heat Exchanger
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
In pump-down work, be sure to stop the compressor before disconnecting the
refrigerant pipe. If the refrigerant pipe is disconnected with the compressor operating
and the stop valve open, air may be sucked in and may generate an over-pressure in
refrigeration cycle, thus resulting in pipe rupture or accidental injury.
When removing or reinstalling the indoor heat exchanger, be sure to wear gloves or
wrap the indoor heat exchanger with cloths. (You may be injured by the fins.)
Caution Be sure to conduct pump down operation before disassembling the refrigerant pipe.
If the refrigerant leaks, repair the spot of leaking, then collect all refrigerant from the
unit. After conducting vacuum drying, recharge proper amount of refrigerant.
From the viewpoint of global environmental protection, make sure to use a vacuum
pump for air purging.
Step Procedure Points
1. Disconnect the refrigerant
piping.
Place a plastic sheet around
the drain pan to prevent
wetting the floor with
remaining drain.
1 Remove the 2 screws.
2
3
Pull out and disconnect
the drain hose.
Wrap the open ends of
the drain hose with
plastic sheets to
prevent water dripping.
Hold the indoor unit up with a
piece of wood.
If embedded in the wall, the
drain hose can be
disconnected from the back
of the unit.
Carry out the removal work
with 2 wrenches.
4
5
6
Disconnect the flare nut
for gas piping.
Disconnect the flare nut
for liquid piping.
Protect the open ends
of both the pipes and
the unit from moisture
intrusion.
(R21525)
Connecting wires
Extension drain
Drain hose
(R17300)
Fixing screw
Drain hose
(R24394)
(R17301)

Indoor Heat Exchanger Si041553EB
14 Removal Procedure
2. Remove the indoor heat
exchanger.
1 Detach the indoor unit
from the installation
plate.
2 Unfasten the 2 hooks
and remove the piping
fixture on the back of
the indoor unit.
3 Slightly pull out the
auxiliary piping.
4 Remove the 3 screws
on the left side.
Step Procedure Points
(R21526)
Piping fixture
Hook
(R21527)
Auxiliary piping
(R21528)
(R21529)

Si041553EB Indoor Heat Exchanger
Removal Procedure 15
5 Unfasten the 2 hooks
on the right side and lift
up the indoor heat
exchanger.
When reassembling the
indoor heat exchanger,
make sure that the 2 hooks
are fastened.
Step Procedure Points
Hook
Indoor heat exchanger
(R21530)

Fan Rotor / Fan Motor Si041553EB
16 Removal Procedure
8. Fan Rotor / Fan Motor
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1 Remove the screw of
the right side plate.
2 First unfasten the hook
(1) and then unfasten
the hook (2) to remove
the right side plate.
When reassembling, make
sure that the 2 hooks are
securely fastened.
3 Remove the fan rotor
and the fan motor.
The fan motor has 3
projections on the right side.
The fan rotor has a rotating
shaft on the left side.
Right side plate
(R21531)
Hook (2)
Hook (1)
(R24289)
Fan rotor
Fan motor (R22757)

Si041553EB Fan Rotor / Fan Motor
Removal Procedure 17
4
5
Pull out the fan motor
from the fan rotor.
Unfasten the 2 hooks of
the motor cover.
6 Disassemble the fan
motor.
Step Procedure Points
Hook
Motor cover
(R21534)
Fan motor cover (body)
Bearing rubber
cushion
Fan motor stator
Rubber cushion
Fan motor
cover (cap)
(R21535)

Fan Guards / Vertical Blade ASSYs Si041553EB
18 Removal Procedure
9. Fan Guards / Vertical Blade ASSYs
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1. Remove the fan guards. The fan guards are not
marked for difference
between right, center and
left.
1
2
3
Remove the sealing
material.
Unfasten the 2 hooks at
the bottom and remove
the fan guard.
Remove the other fan
guards in the same
way.
When reassembling, fit the
fan guard to the 2
projections at the top and
fasten the 2 hooks at the
bottom.
2. Remove the vertical blade
ASSYs.
Each vertical blade ASSY
has 5 fins. It is impossible to
replace only one fin.
The vertical blade ASSY is
not marked for difference
between right, center and
left.
1 Unfasten the upper 2
hooks.
2
3
4
Unfasten the 3 hooks at
the shaft mounting part
by pressing them with a
flat screwdriver.
Remove the vertical
blade ASSY.
Remove the other
vertical blade ASSYs in
the same way.
Hook
Sealing material
Fan guard
(R21536)
Projection
(R21537)
Hook
Vertical blade ASSY (R21538)
Hook (R21539)