Daikin SUPER MULTI NX FTXS15HVJU User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Indoor Unit
Inverter
Wall Mounted Type
15000/18000/24000 Btu/h Class
Si04-955

Service Manual
Removal Procedure
Indoor Unit
zCooling Only zHeat Pump
FTE18JV2S FTXS15HVJU
FTXS18HVJU
FTE24GV2S FTXS24HVJU

Si04-955
Removal Procedure 1
Table of Contents
1. Removal of Air Filters / Front Panel ........................................................2
2. Removal of Front Grille ...........................................................................4
3. Removal of Horizontal Blades / Vertical Blades......................................6
4. Removal of Electrical Box .......................................................................8
5. Removal of PCBs..................................................................................10
6. Removal of Swing Motor .......................................................................13
7. Removal of Indoor Heat Exchanger......................................................14
8. Removal of Fan Rotor / Fan Motor........................................................17
9. Exchange of Drain Hose (Piping Direction)...........................................19
Note: The illustrations may be slightly different depending on the model.

Removal of Air Filters / Front Panel Si04-955
2Removal Procedure
1. Removal of Air Filters / Front Panel
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
1. Appearance features
Warning
Dangerous: High voltage
A high voltage is applied to all
the electric circuits of this
product including
thermistors.
When the signal receiver
catches a signal from the
remote controller, the
receiving tone sounds and
the operation lamp blinks
immediately to confirm the
signal reception.
When the [ON/OFF] button
is kept pressed for 5
seconds, the forced cooling
operation is performed for
about 15 minutes.
2. Remove the air filters.
1Open the front panel to
the position where it
stops.
2Lift the air filter upward
slightly by the center
knob, and then pull it
out downward.
The air filter is not marked
for difference between the
right and left sides.
Insert the air filter with the
"FRONT" mark faced up.
The air filter can be set
easily by inserting it along
the guides.
Be sure to insert the hooks
(at 2 lower positions) when
mounting the air filter.
Room temperature sensor
(thermistor)
(R5323)
Operation lamp
Timer lamp
[ON/OFF] button
Signal
receiver
(R15466)
Front panel
(R5325)
Air filter
(R5326)

Si04-955 Removal of Air Filters / Front Panel
Removal Procedure 3
3Pull out the air filter
downward.
The right and left filters are
interchangeable.
Insert the air filters along
grooves when installing.
Insert the 2 hooks of the air
filter completely.
3. Remove the Titanium
apatite photocatalytic air-
purifying filters.
1Push up the bottom of a
Titanium apatite
photocatalytic air-
purifying filter to
unfasten the hooks (2
on lower, 3 on upper)
and take the filter out.
The right and left filters are
interchangeable.
4. Remove the front panel. Slide the front panel side to
side to release each shaft.
When reassembling the front
panel, fit the right and left
rotary shafts one by one into
the grooves and fully push
them in position.
1While opening the front
panel further than
where it stops, release
both the shafts and
remove the front panel.
Step Procedure Points
"FRONT"
Hook
(R13212)
Hook
Hook
(R13213)
Titanium apatite
photocatalytic air-
purifying filter
(R2752)
(R18632)

Removal of Front Grille Si04-955
4Removal Procedure
2. Removal of Front Grille
Procedure 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 service
cover.
Preparation
Remove the front panel
according to "Removal of Air
Filters / Front Panel".
1Remove the screw of
the service cover.
2Pull out the service
cover.
You can remove the front
grille without detaching the
service cover.
2. Remove the front grille.
1Remove the 3 screws
of the front grille.
Service cover
(R5331)
(R5332)
Front grille
(R5333)

Si04-955 Removal of Front Grille
Removal Procedure 5
2Release the 3 hooks on
the top of the front
grille.
The front grille has 3 hooks
on the center and the both
sides of the upper part.
Refer to the removal
procedure in a reverse way
when reassembling.
The convex marks (...) on
the front panel indicate the
position of the hooks.
3Pull the upper part of
the front grille out and
lift the lower part up,
and then remove the
front grille.
Make sure that all the 3
hooks are placed securely
when reassembling.
Step Procedure Points
(R13215)
(1)
(2)
(R15467)

Removal of Horizontal Blades / Vertical Blades Si04-955
6Removal Procedure
3. Removal of Horizontal Blades / Vertical Blades
Procedure 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 horizontal
blades.
1Open the horizontal
blade (large).
2Release the left shaft of
the horizontal blade.
3Bend the horizontal
blade slightly and
release the 2 center
shafts.
Slide the horizontal
blade to the left and
release the right shaft.
There is a key alignment at
the right shaft. When
reassembling, insert the right
shaft first while turning.
After inserting the right shaft,
mount the horizontal blade to
the center shaft and then to
the left shaft.
Horizontal blade (large)
(R13216)
Horizontal blade (large)
(R13217)
Horizontal blade (large)
(R13218)
Horizontal blade (large)
Key alignment
(R15468)

Si04-955 Removal of Horizontal Blades / Vertical Blades
Removal Procedure 7
4Remove the horizontal
blade (small) in the
same methods.
2. Remove the vertical blade
ASSY.
1Remove the
interlocking shaft for the
vertical blades.
2Release the 3 hooks
with a flat screwdriver
and remove the vertical
blade ASSY.
Step Procedure Points
Horizontal blade (small)
(R13220)
Horizontal blade (small)
(R13221)
Interlocking shaft
(R5342)
Vertical blade ASSY
(R13222)
(R13223)

Removal of Electrical Box Si04-955
8Removal Procedure
4. Removal of Electrical Box
Procedure 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 each
harness.
Preparation
Remove the front grille
according to "Removal of
Front Grille".
1 Remove the screw and
remove the drip proof
plate.
2 Remove the screw of
the earth / ground wire
and cut the clamp.
Be careful not to lose the clip
for the thermistor.
3 Pull out the indoor heat
exchanger thermistor.
4 Disconnect the
connector for the fan
motor [S1].
(R5345)
Drip proof plate
(R5346)
Indoor heat
exchanger
thermistor
Earth /
ground wire
(R18587)
Clip
(R11234)
[S1]
(R5348)

Si04-955 Removal of Electrical Box
Removal Procedure 9
5 Disconnect the
connector for the swing
motor [S6], [S8].
[S6]: for horizontal blade
[S8]: for vertical blade
Some models have no
harness for [S8].
6 Disconnect all the
connection wirings.
7 Remove the screw and
remove the wire clamp.
2. Remove the electrical
box.
1 Remove the screw of
the electrical box.
2 Lift up the lower part of
the electrical box.
3 Release the upper hook
to remove.
Step Procedure Points
[S6]
[S8]
(R16543)
Wire clamp
(R10827)
(R5351)
Electrical box
(R5352)
The electrical box has a
hook on its back.
When reassembling, catch
the back hook of the
electrical box.

Removal of PCBs Si04-955
10 Removal Procedure
5. Removal of PCBs
Procedure 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 terminal board.
2 Release the 3 hooks to
remove the shield plate.
The shield plate also has 2
hooks on the upper side.
3 Press the receiver unit
down to release the
upper hooks, and then
release the lower
hooks.
Terminal
board
(R5353)
Shield
plate
Hook
(R13224)
Receiver unit
(R5355)

Si04-955 Removal of PCBs
Removal Procedure 11
4 Cut the clamp and
detach the harness
from the hook.
Clamps should be always
attached. Fix it as it was
before.
5 The receiver unit has 3
PCBs. From the back
side, release the 3
hooks to remove the
buzzer PCB, and
release the 2 hooks to
remove the display
PCB.
6 Release the 2 hooks to
remove the signal
receiver PCB.
7 Remove the screw to
detach the power
supply terminal unit.
Step Procedure Points
(R5356)
(R13225)
Hook
Hook
Display PCB
Buzzer
PCB
Hook
(R13226)
Signal
receiver PCB
(R10873)
Power supply
terminal unit

Removal of PCBs Si04-955
12 Removal Procedure
8 Cut the clamp.
9 Disconnect the
terminals from the
terminal board.
10 Release the 2 lower
hooks first, and then
release the 2 upper
hooks to remove the
control PCB.
[S1]: DC fan motor
[S6]: swing motor for horizontal
blades
[S8]: swing motor for vertical
blades
[S26]: buzzer PCB
[S28]: signal receiver PCB
[S32]: indoor heat exchanger
thermistor
Some models have no
harness for [S8].
11 Control PCB
Step Procedure Points
(R15508)
Terminal board
(R5361)
(R15510)
Control PCB
Lower hook
Upper hook
[S1]
[S6]
[S7]
[S26]
[S28]
[S32] (R12788)

Si04-955 Removal of Swing Motor
Removal Procedure 13
6. Removal of Swing Motor
Procedure 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 and
remove the swing motor
for horizontal blades.
Preparation
Remove the electrical box
according to "Removal of
Electrical Box".
Swing motor for horizontal blades
(R5364)
Swing motor

Removal of Indoor Heat Exchanger Si04-955
14 Removal Procedure
7. Removal of Indoor Heat Exchanger
Procedure 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 refrigerant
piping.
Preparation
Remove the electrical box
according to "Removal of
Electrical Box".
Caution
If refrigerant leaks, repair the
spot of leaking, then collect
all refrigerant from the unit.
After conducting vacuum
drying, recharge proper
amount of refrigerant.
Caution
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.
Place a plastic sheet under
the drain pan to prevent from
wetting the floor with
remaining drain.
If the drain hose is
embedded in the wall,
disconnect the drain hose
beforehand.
Carry out the removal works
with 2 wrenches.
When the pipings are
disconnected, protect both
the openings of pipe and unit
from entering of moisture.
1Hold the indoor unit up
with a piece of wood
etc.
2Cover the drain hoses
with vinyl covers.
3Unscrew the flare nut
for gas piping.
4Unscrew the flare nut
for liquid piping.
(R5370)
Drain hose (R15469)
(R5372)
(R5373)

Si04-955 Removal of Indoor Heat Exchanger
Removal Procedure 15
2. Remove the indoor unit.
1Remove the indoor unit
from the installation
plate.
3. Remove the indoor heat
exchanger.
1Unfasten the hook of
the piping fixture at the
back of the indoor unit
and pull out the piping.
2Slightly widen the
auxiliary piping.
Step Procedure Points
(R5374)
Piping
fixture
(R5375)
Auxiliary piping
(R5376)

Removal of Indoor Heat Exchanger Si04-955
16 Removal Procedure
3Unfasten the hooks on
the left side of the
indoor heat exchanger. Caution
When removing or
reassembling the indoor heat
exchanger, be sure to wear
protective gloves or wrap the
indoor heat exchanger with
cloths. (You may be injured
by the fins.)
4Push to release the
fixing hooks on the right
side.
5Pull the indoor heat
exchanger to the front
side and release the
hooks completely, and
then lift it.
Step Procedure Points
Hook
(R13228)
Hook
(R13229)
Indoor heat exchanger
(R5379)

Si04-955 Removal of Fan Rotor / Fan Motor
Removal Procedure 17
8. Removal of Fan Rotor / Fan Motor
Procedure 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 right side
plate.
1Remove the 2 screws
of the right side plate.
You can remove the fan
rotor without detaching the
right side plate.
2Lift the right side plate
and remove it.
2. Remove the fan rotor.
1Remove the screw and
remove the fan motor
fixture.
2Loosen the fixing screw
of the fan rotor.
Right
side
plate
(R16544)
Right side plate
(R16545)
Fan motor fixture
(R5382)
(R5383)

Removal of Fan Rotor / Fan Motor Si04-955
18 Removal Procedure
3Remove the fan rotor. When reassembling the fan
motor and the fan rotor,
provide as much as 5 mm of
play between the side face
of the rotor and the bottom
frame.
(1) Insert the fan motor with
approx. 5 mm left.
(2) Tighten the screw until it
stops. Then give the screw
one more turn.
(3) Rotate the fan rotor and
confirm the fan motor and
the fan rotor are installed
appropriately.
(4) Tighten the screw
completely if appropriate.
(5) If not appropriate, go back to
(1).
3. Remove the bearing.
1Remove the fan rotor.
The bearing is on the
left side.
2Remove the 2 screws
and remove the left side
plate.
3The bearing is made of
rubber. Push it inwards
firmly and remove it.
Step Procedure Points
Fan motor
(R13230)
5 mm
Side face of rotor
(R2808)
Side face of
bottom frame
(R9582)
Fan rotor
(R5385)
Left side plate
(R16546)
Bearing
(R5387)