Daikin RXR28EV1B8 User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
2.8/4.2/5.0 kW Class
Si001275

Service Manual
Removal Procedure
Outdoor Unit
zHeat Pump
RXR28EV1B8
RXR42EV1B8
RXR50EV1B8

Si001275
Removal Procedure 1
Table of Contents
1. Humidifier Unit.........................................................................................2
2. Heater Assembly / Humidifying Rotor / Humidifying Rotor Motor ...........3
3. Humidifying Fan Assembly / Damper Assembly .....................................5
4. Hygroscopic Fan Motor...........................................................................7
5. Outdoor Fan / Fan Motor.........................................................................8
6. Humidifying Duct ...................................................................................12
7. Electrical Box ........................................................................................13
8. PCB.......................................................................................................15
9. Sound Blankets .....................................................................................17
10.Thermistor Assembly ............................................................................19
11.Reactor / Partition Plate ........................................................................21
12.Four Way Valve.....................................................................................22
13.Electronic Expansion Valve...................................................................24
14.Compressor...........................................................................................26
Note: The illustrations may be slightly different depending on the model.

Humidifier Unit Si001275
2Removal Procedure
1. Humidifier Unit
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1Remove the 4 screws
and remove the top
panel.
2Disconnect the 5 relay
connectors.
3Disconnect the
connector for the
humidifier fan motor.
Pull out the connector while
pushing up the hook on the
bottom side.
When installing the
humidifier unit, do not forget
to connect the relay
connectors.
4Remove the 4 screws
and remove the
humidifier unit.
(R13982)
Top panel
(R5792)
(R13983)
Humidifier fan motor
<From the back side>
(R5796)
(R13984)
Humidifier unit

Si001275 Heater Assembly / Humidifying Rotor / Humidifying Rotor Motor
Removal Procedure 3
2. Heater Assembly / Humidifying Rotor /
Humidifying Rotor 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 heater
assembly.
1Remove the 4 screws
and remove the duct on
adsorption side.
2Release the lead wire
for the humidifying
rotor motor from the
hooks.
3Remove the 2 screws
and remove the heater
assembly.
The heater assembly should
be replaced as an assembly
set. (Disassembling of the
assembly may cause
malfunction.)
2. Remove the humidifying
rotor.
1Release the fan motor
lead wire from the
hooks.
(R18766)
Duct on adsorption side
Heater assembly
(R18767)
Humidifying rotor motor
(R5800)
(R18768)
Fan motor lead wire
Hook
Hook

Heater Assembly / Humidifying Rotor / Humidifying Rotor Motor Si001275
4Removal Procedure
2Remove the bell mouth
on adsorption side.
3Remove the
humidifying rotor.
A heat catalyst (black) is
applied on the upper side.
3. Remove the humidifying
rotor motor.
1Remove the 2 screws
and remove the
humidifying rotor
motor.
Step Procedure Points
Bell mouth
(R13988)
Humidifying rotor
(Moisture adsorption
element)
(R13989)
(R18769)
Humidifying rotor
motor
Rotor driving part
(R5809)

Si001275 Humidifying Fan Assembly / Damper Assembly
Removal Procedure 5
3. Humidifying Fan Assembly / Damper Assembly
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 humidifying
fan assembly.
1Peel off the 2 tapes.
2
3
Remove the 5 screws
of the humidifying fan
assembly.
Unfasten the 2 hooks
while bending the right
side panel.
4Remove the
humidifying fan
assembly.
The humidifying fan
assembly should be
replaced as an assembly
set. (Disassembling of the
assembly can cause a
noise.)
5Peel the seal material
and pull out the
humidifying thermistor.
Inside of the upper part of
the humidifying fan
assembly
(R13990)
Humidifying thermistor
Humidifying fan assembly
(R18365)
Hook
Hook
(R5813)
(R5814)
(R5815)

Humidifying Fan Assembly / Damper Assembly Si001275
6Removal Procedure
2. Remove the damper
assembly.
1Remove the 3 screws.
2Remove the damper
assembly.
3
4
Remove the screw and
remove the damper
motor.
Disconnect the limit
switch.
Step Procedure Points
(R18770)
Damper assembly
Damper motor
(R13992)
Limit switch
(R5819)

Si001275 Hygroscopic Fan Motor
Removal Procedure 7
4. Hygroscopic Fan Motor
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1Remove the nut and
remove the
hygroscopic fan.
Nut size: M6
When reassembling, align
the mark of the fan with
the D-cut section of the
motor shaft.
2Remove the 3 screws
of the motor cover.
3Remove the motor
cover and the
hygroscopic fan motor.
Nut
Hygroscopic
fan
(R13993)
10 mm
(R17216)
(R5822)
Hygroscopic
fan motor
Motor cover
(R13994)

Outdoor Fan / Fan Motor Si001275
8Removal Procedure
5. Outdoor Fan / 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 shield plate. Be careful not to forget to
install, not to lose, and not
to break the shield plate and
the electrical box cover.
1Remove the screw.
2Release the
harnesses.
3Remove the shield
plate.
2. Remove the electrical box
cover.
1
2
Remove the screw.
Remove the electrical
box cover.
Shield plate
(R13995)
(R5826)
(R13996)
(R18366)

Si001275 Outdoor Fan / Fan Motor
Removal Procedure 9
3Remove the insulation
sheet.
3. Remove the front panel.
1
2
Remove the 7 screws.
Unfasten the 5 hooks
and remove the front
panel.
3Remove the 4 screws
and remove the front
grille.
4. Remove the outdoor fan. Nut size: M6
When reassembling, align
the mark of the outdoor
fan with the D-cut section of
the motor shaft.
1Remove the nut and
remove the outdoor
fan.
Step Procedure Points
(R13997)
Insulation sheet
(R13998)
Hook
Hook
Hook
Front panel
(R14000)
Front grille
D cut
(R18367)
10 mm
(R17216)
mark
(R5834)

Outdoor Fan / Fan Motor Si001275
10 Removal Procedure
5. Remove the fan motor.
1Disconnect the
connector for the fan
motor [S70].
2Release the fan motor
lead wire from the
hooks.
3Remove the screw of
the fan motor fixing
plate.
Step Procedure Points
[S70]
(R5836)
Fan motor lead wire
(R13999)
(R14001)
Fan motor fixing plate

Si001275 Outdoor Fan / Fan Motor
Removal Procedure 11
4Detach the upper part
of the fan motor fixing
plate.
5Fan motor fixing plate
has 2 hooks on lower
part.
6Unfasten the hook and
release the fan motor
lead wire.
When reassembling, put the
fan motor lead wire through
the back of the fan motor
(so as not to be entangled
with the outdoor fan).
7Remove the 4 screws
of the fan motor.
8Pull out the rubber
vibration isolators
sideward.
Step Procedure Points
(R5839)
(R5840)
(6)
(8)
(7)
(R14002)
(R3249)
Lead wire Outdoor fan

Humidifying Duct Si001275
12 Removal Procedure
6. Humidifying Duct
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 stop valve
cover.
2Remove the screw and
remove the humidifying
duct.
When reassembling, make
sure to catch the hook.
(R18771)
Stop valve
cover
(R14004)
Humidifying duct

Si001275 Electrical Box
Removal Procedure 13
7. Electrical Box
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1Release the harnesses
for the humidifier unit
from the hook.
2Disconnect the
connectors
[S20][S70][S72][S80]
[S90][S91].
[S20]: electronic expansion
valve coil
[S70]: fan motor
[S72]: humidifier fan motor
[S80]: four way valve coil
[S90]: thermistor assembly
[S91]: humidifying thermistor
3Disconnect the 2
terminals from the
reactor.
When reassembling, you
can connect the 2
harnesses in either way
regardless of the color.
4Disconnect the relay
harness for the
compressor.
(R14005)
[S70] [S72] [S80] [S20][S91] [S90]
(R18477)
(R18772)
(R14010)

Electrical Box Si001275
14 Removal Procedure
5
6
Remove the screw of
the terminal board.
Remove the screws
and disconnect the
connecting wires and
the power supply
cables.
Thermal fuse should be
replaced with the terminal
board.
You can work without
removing the terminal
board.
7 Disconnect the 4
connectors.
8 Remove the screw and
detach the earth wire.
9 Detach the clamp for
the thermistor
assembly from the
electrical box.
10
11
Remove the 2 screws
of the electrical box.
Lift the electrical box
and remove it.
Step Procedure Points
(R18478)
Black
White Red Green/Yellow
Earth
(R14011)
Clamp (R14012)
(R18479)

Si001275 PCB
Removal Procedure 15
8. PCB
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1Remove the 7 screws.
2Detach the radiation
fin.
In working, be careful not to
break the PCB with the
excessive force because
the PCB and the radiation
fin are adhered to one
another.
When reassembling, make
sure to apply the silicon
grease evenly.
3Remove the 2 screws
and detach the clip to
remove the radiation
shield plate.
4Cut the 3 clamps.
(R14015)
(R18480)
Radiation fin
Clip
Radiation shield
plate
(R14016)
(R5864)

PCB Si001275
16 Removal Procedure
5
6
Remove the 2 screws.
Unfasten the 3 hooks
of the electrical box.
7
8
Remove the PCB from
the electrical box.
Disconnect the
connectors.
Step Procedure Points
(R18481)
Hook
(R5867)

Si001275 Sound Blankets
Removal Procedure 17
9. Sound Blankets
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
panel.
1
2
3
Remove the 3 screws
on the back side of the
right side panel.
Remove the 2 screws
on the right side.
Lift the right side panel
to unfasten the 2 hooks
and remove it.
2. Remove the sound
blankets.
Since the piping ports on
the sound blanket are torn
easily, remove the blanket
carefully.
1Remove the sound
blanket (top).
2
3
Untie the strings and
open the sound blanket
(outer).
Pull the sound blanket
(outer) out.
(R18482)
Hook
Hook
(R14055)
Sound blanket (top)
(R14023)
Sound blanket
(outer)

Sound Blankets Si001275
18 Removal Procedure
4Open the sound
blanket (inner) and pull
it out.
5Pull the sound blanket
(bottom) out.
Step Procedure Points
(R18483)
Sound blanket
(inner)
(R14022)
Sound blanket
(bottom)