Daikin FTXR28EV1B9 User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Indoor Unit
Inverter
Wall Mounted Type
2.8/4.2/5.0 kW Class
Si041260

Service Manual
Removal Procedure
Indoor Unit
zHeat Pump
FTXR28EV1B9
FTXR42EV1B9
FTXR50EV1B9

Si041260
Removal Procedure 1
Table of Contents
1. Air Filters / Panels ...................................................................................2
2. Front Grille ..............................................................................................7
3. Front Panel Mechanism Assembly..........................................................9
4. Reduction Motor ...................................................................................10
5. Electrical Box ........................................................................................12
6. PCBs .....................................................................................................15
7. Dehumidifying Solenoid Valve Coils .....................................................18
8. Connecting Duct....................................................................................19
9. Drain Hose ............................................................................................20
10.Swing Motors ........................................................................................22
11.Indoor Heat Exchanger .........................................................................24
12.Fan Rotor / Fan Motor...........................................................................26
13.Horizontal Blades / Vertical Blades .......................................................28
14.Streamer Unit ........................................................................................30
Note: The illustrations may be slightly different depending on the model.

Air Filters / Panels Si041260
2Removal Procedure
1. Air Filters / Panels
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.
1Open the front panel.
2Keep the front panel
open with the support
plate.
3Push the air filter up.
4Pull the air filter
downward and remove
it.
The shapes of the right and
left filters are different.
Insert the filters along the
guide for easy installation.
(R18485)
Front panel
Support point
Support
plate
(R5624)
Hook
(R5625)
(R18548)
Air filter
(R5628)

Si041260 Air Filters / Panels
Removal Procedure 3
2. Remove the deodorizing
filter for streamer.
1Pull the center knob to
unfasten the hook.
2Pull out the deodorizing
filter for streamer.
3Slide the filter and
remove it.
When cleaning, keep the
filter with the frame to
prevent breakage.
3. Remove the electrode unit.
1Pull down the electrode
unit with holding the
knob.
Step Procedure Points
(R5629)
(R13946)
Deodorizing filter
for streamer
Hook
(R14114)
Electrode unit
(R13947)

Air Filters / Panels Si041260
4Removal Procedure
4. Remove the Titanium
apatite photocatalytic air-
purifying filter.
Insert the filter along the
guide for easy installation.
1Release the projection
of the frame of
Titanium apatite
photocatalytic air-
purifying filter and
remove it.
2Remove the Titanium
apatite photocatalytic
air purifying filter.
5. Remove the air supply
filter.
Insert the filter along the
guide for easy installation.
Install the air supply filter
correctly so that the front
mark comes front.
Humidifying operation
without installing the air
supply filter may form
condensation inside the
front panel and it causes
water leakage.
There are 4 hooks for the air
supply filter.
1Lift the air supply filter
up and take it out.
2Unfasten the 2 hooks
to open the frame and
remove the air supply
filter.
Step Procedure Points
(R18486)
Titanium apatite photocatalytic
air-purifying filter
Guide
Hook
Hook
(R14115)
(R13949)
Air supply filter
(R18549)
Hook
Hook

Si041260 Air Filters / Panels
Removal Procedure 5
6. Remove the front panel.
1Open the front panel
over the stopping
position.
2
3
Push the panel
stoppers outward on
both sides to detach
the rotary shafts from
the holes.
Slide the rotary shaft
on the left to the right
and pull it out.
4Slide the rotary shaft
on the right to the left
and pull it out.
5Remove the front
panel.
Step Procedure Points
(R5640)
Rotary shaft
Panel
stopper
(R18699)
Rotary shaft
(R18700)
(R5644)

Air Filters / Panels Si041260
6Removal Procedure
7. Remove the service cover.
1
2
Remove the screw
(black) of the service
cover.
Slide the service cover
downward to unfasten
the hook on the back
side.
3Remove the service
cover.
When reassembling, catch
the 2 hooks on the far side
first, and close the cover.
8. Remove the upper panel.
1Pinch and unfasten the
hook A and hook B.
2
3
Lift the right and left
sides to bend the upper
panel and slightly pull it
to unfasten the hook C.
Pull the upper panel
and remove it.
When reassembling, make
sure to catch the 3 hooks on
the far side.
Step Procedure Points
(R18487)
Service cover
Hook
Back side hook (R13950)
(R18488)
Upper panel
Hook A
Hook B
Hook C
Hook
Hook
Hook in front
(R18489)

Si041260 Front Grille
Removal Procedure 7
2. 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 front grille. If the hooks are hard to be
unfasten, use a flat
screwdriver.
The convex marks (...) on
the front panel indicate the
position of the hooks.
1Remove the 3 screws.
2Unfasten the upper 3
hooks.
3Open the horizontal
blade (large) fully for
preventing it from
getting caught in
pulling the front grille
out.
4Remove the front grille.
2. Points on installing the
front grille
When reassembling, make
sure that the horizontal
blade (large) does not come
inside.
When reassembling, follow
the same steps for removal
in reverse.
1When reassembling
the front grille, fit the 4
lower hooks and push
in until they click.
(R13952)
Front grille
Hook
(R5654)
Horizontal blade (large) (R14117)
(R5657)
(R5658)
Front grille (R5659)

Front Grille Si041260
8Removal Procedure
2There is a gear for front
panel driving.
3The front panel
mechanism assembly
is fixed to the front
grille.
Check that the arm is in
the stored position.
4Installation structure
5Movement of the arm
Step Procedure Points
Gear
(R13953)
Arm
Front panel mechanism assembly
(R13954)
(R5662)
(R5663)

Si041260 Front Panel Mechanism Assembly
Removal Procedure 9
3. Front Panel Mechanism Assembly
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1
2
Remove the 2 screws.
Unfasten the hook
while straightening the
front panel mechanism
assembly (right) and
remove it.
When reassembling, catch
the hook first.
3Pull out the front panel
mechanism assembly
(right) from the shaft.
Replace the front panel
mechanism as an assembly
kit.
4Pull out the shaft from
the front panel
mechanism assembly
(left).
5
6
Remove the 2 screws.
Remove the front panel
mechanism assembly
(left).
Replace the front panel
mechanism as an assembly
kit.
Front panel mechanism assembly (right) (R18490)
Hook
(R13956)
Shaft
Front panel
mechanism
assembly
(left)
(R13957)
(R5668)

Reduction Motor Si041260
10 Removal Procedure
4. Reduction Motor
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1Disconnect the relay
connector for the
reduction motor.
The figure above shows the
hook on the connector for
the reduction motor
assembly.
When touching the electrical
parts like the limit switch, be
sure to conduct the work
after discharging static
electricity of the human
body. It may cause trouble
of the PCB.
2Remove the screw and
remove the reduction
motor assembly.
3
4
Remove the screw.
Cut the clamp.
5Slide the cover to the
right to unfasten the
hook.
(R13958)
Reduction motor assembly
(R5671)
Limit switch
(R5672)
Clamp
(R18491)
Hook
(R5675)

Si041260 Reduction Motor
Removal Procedure 11
6Lift the cover of the
reduction motor up
slightly to unfasten the
upper hook, and
remove it.
7Pull the gear out to
remove. Remove the
screw of the reduction
motor.
8Turn the reduction
motor assembly over
and peel off the tape.
9Remove the reduction
motor.
The connector of the
reduction motor can be
disconnected.
10 Unfasten the 2 hooks
and remove the limit
switch.
Step Procedure Points
Hook
(R5676)
(R5677)
(R5678)
Hook
(R13959)

Electrical Box Si041260
12 Removal 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
1. Disconnect the
connectors.
1Open the electrical box
cover.
2Remove the screw and
remove the wire fixture.
3Remove the screws
and disconnect the
connecting wires.
4Disconnect the
connector [S43].
[S43]: dehumidifying solenoid
valve coils
5Disconnect the
connector [S52].
[S52]: streamer unit PCB
Electrical box cover
(R13960)
(R18492)
Wire fixture
Connecting
wires
(R14155)
Dehumidifying solenoid valve coil
[S43]
[S52]
(R5685)

Si041260 Electrical Box
Removal Procedure 13
6Disconnect the
connector [S41].
[S41]: swing motors
The connector [S41] is for
both horizontal blades and
vertical blades.
7Disconnect the
connector [S1] and
release the lead wire
from the hook.
[S1]: fan motor
8Remove the screw and
remove the drip proof
cover.
9Remove the 2 screws
of the earth wires.
Step Procedure Points
[S41]
(R5686)
[S1]
(R18493)
Hook
Drip proof cover (R5689)
(R5690)

Electrical Box Si041260
14 Removal Procedure
10 Pull out the indoor heat
exchanger thermistor.
Be careful not to lose the
clip for the thermistor.
2. Remove the electrical box.
1Remove the screw of
the electrical box.
2Close the electrical box
cover and slide the
electrical box to
unfasten the hook in
the key hole.
3
4
Push up the bottom
side of the electrical
box or push the bottom
frame to the back.
Unfasten the upper
hook and remove the
electrical box.
When reassembling, insert
the upper hook and push
slightly, and then make sure
to catch the lower hook.
Step Procedure Points
Indoor heat exchanger
thermistor
Clip
(R14158)
Electrical
box
(R5692)
(R5693)
(R18494)
Hook

Si041260 PCBs
Removal Procedure 15
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 shield plate
1
2
While opening the
shield plate, unfasten
the lower hook.
Lift the shield plate up
to unfasten the upper
hook and remove it.
2. Remove the terminal
board.
1Remove the screw and
pull out the terminal
board.
2Disconnect the
terminals with pliers.
Black...... (1) power supply
White ..... (2) power supply
Red ........ (3) signal
Green..... earth
3. Remove the control PCB. When reassembling, fix the
harnesses with clamps.
1Cut the 3 clamps.
Lower hook
(R18708)
Upper hook
(R18495)
(R14161)
Terminal board
(R14162)
Clamp Control PCB (R14163)

PCBs Si041260
16 Removal Procedure
2Release the earth wire
from the hook.
3Disconnect the
connectors [S46] [S48].
[S46]: display PCB
[S48]: humidity sensor PCB
4Pull out the relay
connector for the
reduction motor from
the back side of the
electrical box cover.
5Remove the 2 screws
and remove the control
PCB.
Step Procedure Points
(R5704)
[S48]
[S46]
(R5705)
Relay connector for
reduction motor
(R14164)
(R5708)

Si041260 PCBs
Removal Procedure 17
4. Remove the humidity
sensor PCB.
1
2
Unfasten the hook and
pull out the humidity
sensor PCB.
Disconnect the
connector [CN1] and
remove the humidity
sensor PCB.
5. Remove the display PCB
and the signal receiver /
transmitter PCB.
[S56]: control PCB
1
2
Peel off the tape.
Disconnect the
connector [S56].
3Unfasten the upper
hook with a flat
screwdriver.
4Unfasten the lower
hook and remove the
lamp cover assembly.
5Unfasten the 3 hooks
and remove the display
PCB and the signal
receiver / transmitter
PCB.
The display PCB and the
signal receiver / transmitter
PCB are united.
Step Procedure Points
(R18701)
[CN1]
Humidity sensor
PCB
[S56]
(R18496)
Display PCB
Signal receiver / transmitter PCB
Lamp
cover
assembly
Tape
Upper
hook
Lower hook
(R5713)
Hook
(R18497)
Display PCB
Signal
receiver /
transmitter
PCB

Dehumidifying Solenoid Valve Coils Si041260
18 Removal Procedure
7. Dehumidifying Solenoid Valve Coils
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1Disconnect the
connector [S43].
[S43]: dehumidifying solenoid
valve coils
2Pull out and remove
the dehumidifying
solenoid valve coils.
The dehumidifying solenoid
valve coils do not need
screws.
Dehumidifying solenoid valve coil
(R5717)
(R14155)
Dehumidifying solenoid valve coil
[S43]
(R5719)