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)