Daikin FTXM35K3V1B User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Indoor Unit
Inverter
Wall Mounted Type
3.5/4.2/5.0 kW Class
Si041259EA

Service Manual
Removal Procedure
Indoor Unit
zHeat Pump
FTXM35K3V1B
FTXM42K3V1B
FTXM50K3V1B
FTXS35K2V1B
FTXS42K2V1B
FTXS50K2V1B

Si041259EA
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 ..........................................................................................6
6. PCBs .......................................................................................................8
7. Swing Motors ........................................................................................11
8. Indoor Heat Exchanger .........................................................................16
9. Fan Motor / Fan Rotor...........................................................................18
10.Vertical Blade ASSY .............................................................................19
Note: The illustrations may be slightly different depending on the model.

Air Filters Si041259EA
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 filter. 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
installing the air filter.
1Open the front panel.
2Pull out the air filter
downward and remove
it.
3Remove the other air
filter in the same way.
2. Remove the Titanium
apatite photocatalytic air-
purifying filters.
1Remove the Titanium
apatite photocatalytic
air-purifying filter ASSY
by unfastening the 4
projections from the
back of the filter.
The right and left filters are
interchangeable.
2Remove the Titanium
apatite photocatalytic
air-filter from its frame.
(R19019)
Air filter
Front panel
Titanium apatite photocatalytic
air-purifying filter ASSY
Air filter
(R19020)
Projection
Projection
(R13174)

Si041259EA 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
1Open the front panel
over the position where
it stops.
2Release the left rotary
shaft.
When reassembling the front
panel, fit the right and left
rotary shafts one by one into
the grooves and fully push
them into position.
3Release the right rotary
shaft and remove the
front panel.
(R19021)
Front panel
(R19022)
Rotary shaft
(R19023)

Front Grille Si041259EA
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
1Remove the 3 screws.
2Open the horizontal
blade and unfasten the
3 hooks at the top.
The convex marks (...) on
the front panel indicate the
position of the hooks.
3Pull out the upper part
of the front grille and lift
up the lower part, and
then remove the front
grille.
When reassembling, make
sure that the 3 hooks are
fastened as they were.
(R19024)
(R19025)
Hook
Horizontal blade (R19026)
(R19027)
Front grille

Si041259EA 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
1Open the horizontal
blade.
The center shaft can be
released easily by bending
the blade.
2Unfasten the center
shaft while bending the
horizontal blade (large)
slightly.
3Unfasten the left shaft.
4Unfasten the right shaft
and remove the
horizontal blade (large).
Installation procedure
1. Since the key pattern hook is
provided, rotate the blade
and fit it to the right shaft
first.
2. Fit the blade to the center
and left shafts.
When reassembling, mount
the large horizontal blade to
the upper position and the
small horizontal blade to the
lower position.
Do not put them in the wrong
place.
5Remove the horizontal
blade (small) in the
same way.
(R19028)
Horizontal blade (large)
(R19029)
(R19030)
(R19031)

Electrical Box Si041259EA
6Removal Procedure
5. Electrical Box
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1Remove the screw and
remove the service
cover.
2Remove the screw and
remove the wire fixture.
3Remove the 4 screws
of the terminal board
and disconnect the
connecting wires.
4Unfasten the 3 hooks
and remove the PCB
box cover.
(R19032)
Service cover
(R19033)
Terminal board
Wire fixture Connecting wire
Hook
PCB box
cover
(R19034)
Hook

Si041259EA Electrical Box
Removal Procedure 7
5Disconnect the
connectors [S1] [S41].
[S1]: fan motor
[S41]: swing motors
6Release the harnesses
for the fan motor and
swing motors from the
hooks.
7Remove the screw and
detach the earth /
ground wire.
Be careful not to lose the clip
of the thermistor.
8Pull out the indoor heat
exchanger thermistor.
9Remove the screw of
the electrical box.
Unfasten the hook at the
back.
10 Lift up the electrical box
and pull it out.
Step Procedure Points
Hook
[S1]
[S41]
Hook
(
R19035
)
Indoor heat exchanger thermistor
(R19036)
Earth / ground wire
Clip
(R11268)
(R19037)
Electrical box

PCBs Si041259EA
8Removal 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 signal
receiver PCB.
[S46]: display PCB
1Disconnect the
connector [S46].
2Unfasten the 2 hooks
and remove the signal
receiver unit.
3Unfasten the 3 hooks
and remove the signal
receiver PCB.
[S48]: control PCB
4Disconnect the
connector [S48].
(R19038)
[S46]
(R19152)
Signal receiver unit
Hook
Hook
(
R19039
)
[S48] Si
g
nal receiver PCB
Hook

Si041259EA PCBs
Removal Procedure 9
2. Remove the
INTELLIGENT EYE
sensor PCB.
1Unfasten the 2 hooks
and remove the shield
plate.
2Unfasten the 3 hooks
and remove the
INTELLIGENT EYE
sensor PCB.
[S26]: control PCB
3Disconnect the
connector [S26].
3. Remove the display PCB.
1Turn over the signal
receiver unit.
2Unfasten the 4 hooks
and remove the display
PCB.
3Disconnect the
connector [S49]. [S49]: control PCB
Step Procedure Points
(R19040)
Shield plate
Hook
Hook
Hook
INTELLIGENT
EYE sensor
PCB
[S26]
(R19041)
Display PCB
(R19042)
Hook
Hook
(
R19043
)
[S49]

PCBs Si041259EA
10 Removal Procedure
4. Remove the control PCB. 1: black (front)
1Disconnect all the
terminals from the
terminal board.
2: white (front)
3: red (front)
: green (front)
green/yellow (back)
2Unfasten the 2 lower
hooks of the control
PCB.
3Lift up the bottom of the
control PCB and pull it
out.
The control PCB is also fixed
by 2 upper hooks. When
reassembling, be sure to fit
all the 4 hooks.
Step Procedure Points
(R19044)
Terminal board
(R19171)
Hook
Control PCB
(R8098)

Si041259EA Swing Motors
Removal Procedure 11
7. Swing Motors
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Caution When reassembling, do not confuse the installing order of the 2 motors for horizontal
blades and the colors of the connectors.
If you set the connectors or motors opposite, the horizontal blades do not move
smoothly or noise may be heard.
Step Procedure Points
1. Remove the swing motor
for horizontal blades.
1Release the harness for
the swing motors from
the 3 hooks.
2Remove the screw and
remove the cover link
(2).
3Remove the 2 screws
and remove the swing
motor for horizontal
blade (small).
(R19045)
Hook
(R19046)
Cover link (2)
(R19047)
Swing motor for
horizontal blade (small)

Swing Motors Si041259EA
12 Removal Procedure
4Disconnect the
connector (green) from
the swing motor.
5Remove the 2 screws
and remove the swing
motor for horizontal
blade (large).
6Disconnect the
connector (red) from
the swing motor.
When reassembling, mount
the swing motor for
horizontal blade (large) first.
(connector: red)
Next, mount the swing motor
for horizontal blade (small).
(connector: green)
7Release the swing
motor harness from the
hook of the cover link
(1).
Step Procedure Points
(R19048)
(R19049)
Swing motor
for horizontal
blade (large)
(R19050)
(R19051)
Cover link (1)
Hook

Si041259EA Swing Motors
Removal Procedure 13
2. Remove the swing motor
for vertical blade ASSY.
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 work
with 2 wrenches.
When the pipings are
disconnected, protect both
the openings of pipe and unit
from entering moisture.
1Remove the 2 screws
which fix the indoor unit
to the installation plate.
2Disconnect the gas
piping and the liquid
piping.
3Detach the indoor unit
from the installation
plate.
4Unfasten the hook and
remove the piping
fixture on the back of
the indoor unit.
5Slightly widen the
auxiliary piping.
Step Procedure Points
(R19059)
(R19060)
(R19052)
Piping fixture
(R19053)
Auxiliary piping

Swing Motors Si041259EA
14 Removal Procedure
6Remove the screw
behind the drain hose,
and disconnect the
drain hose.
7Remove the 2 screws
at the rear and on the
side of the cover link
ASSY (1).
8Detach the interlock
shaft (2) with a flat
screwdriver, and then
detach the cover link
ASSY (1).
Step Procedure Points
(R19054)
Drain hose
(R19055)
Cover link ASSY (1)
(R19056)
Interlock
shaft (2)

Si041259EA Swing Motors
Removal Procedure 15
9Remove the 2 screws
and remove the swing
motor for vertical blade
ASSY.
10 Disconnect the
connector (white) from
the swing motor.
Step Procedure Points
(R19057)
Swing motor for
vertical blade ASSY
(R19058)

Indoor Heat Exchanger Si041259EA
16 Removal Procedure
8. 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
1Remove the 2 screws
which fix the indoor unit
to the installation plate.
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 work
with 2 wrenches.
When the pipings are
disconnected, protect both
the openings of pipe and unit
from entering moisture.
2Disconnect the gas
piping and the liquid
piping.
3Detach the indoor unit
from the installation
plate.
4Unfasten the hook and
remove the piping
fixture on the back of
the indoor unit.
(R19059)
(R19060)
(R19052)
Piping fixture

Si041259EA Indoor Heat Exchanger
Removal Procedure 17
5Slightly widen the
auxiliary piping.
6Remove the 2 screws
on the left side.
7Unfasten the upper
hook on the right side
with a flat screwdriver.
8After unfastening the
lower hooks, lift up the
indoor heat exchanger
by its right side.
When reassembling the
indoor heat exchanger,
make sure that the right
hooks (upper and lower) are
fastened.
9Remove the indoor
heat exchanger.
Step Procedure Points
(R19053)
Auxiliary piping
(R10546)
(R19061)
(R19062)
Indoor heat exchanger

Fan Motor / Fan Rotor Si041259EA
18 Removal Procedure
9. Fan Motor / Fan Rotor
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1Remove the 2 screws
and remove the right
side plate.
2Remove the screw and
remove the fan motor
fixing plate.
When reassembling the fan
motor and the fan rotor,
provide as much as 5 mm
(0.2 inch) of play between
the side face of the rotor and
the bottom frame.
(1) Insert the fan motor with
approx. 5 mm (0.2 inch) 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).
3Loosen the lock screw
and remove the fan
motor.
4Remove the fan rotor.
(R19063)
Right side
plate
(R19064)
Fan motor fixing plate
5 mm (0.2 inch)
Side face of rotor
(R18879)
Side face of
bottom frame
(R9582)
(R19065)
Lock screw
Fan motor
(R19066)
Fan rotor