Daikin RXR28KVMA User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
2.8/4.2/5.0 kW Class
Outdoor Unit
Inverter
Pair Type
Si001080

Service Manual
Removal Procedure
Outdoor Unit
zHeat Pump
RXR28KVMA
RXR42KVMA
RXR50KVMA

Si001080
Removal Procedure 1
Table of Contents
1. Removal of Humidifier Unit .....................................................................2
2. Removal of Heater Assembly /
Humidifying Rotor / Humidifying Rotor Motor..........................................5
3. Removal of Humidifying Fan Assembly ..................................................8
4. Removal of Hygroscopic Fan Motor......................................................11
5. Removal of Outdoor Fan / Fan Motor ...................................................12
6. Removal of Humidifying Duct................................................................16
7. Removal of Electrical Box .....................................................................17
8. Removal of PCB....................................................................................21
9. Removal of Sound Blankets..................................................................24
10.Removal of Thermistor Assembly .........................................................26
11.Removal of Reactor / Partition Plate .....................................................28
12.Removal of Four Way Valve .................................................................29
13.Removal of Electronic Expansion Valve ...............................................31
14.Removal of Compressor .......................................................................32
Note: The illustrations may be slightly different depending on the model.

Removal of Humidifier Unit Si001080
2Removal Procedure
1. Removal of Humidifier Unit
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
1. External appearance
2. Remove the top panel.
1Remove the 4 screws
and remove the top
panel.
Humidifier unit air inlet (1)
Humidifier
unit
Humidifier
unit air
outlet
(R13980)
(R13981)
Humidifier unit air inlet (2)
Outdoor
temperature
thermistor
(R13982)
Top panel

Si001080 Removal of Humidifier Unit
Removal Procedure 3
3. Remove the humidifier
unit.
Be sure to wait for 10
minutes or more after
turning off the power supply
before disconnecting the
connectors.
1The figure shows the
arrangement of the
relay harnesses.
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.
Step Procedure Points
(R5791)
(R5792)
(R13983)
Humidifier fan motor
<From the back side>
(R5796)

Removal of Humidifier Unit Si001080
4Removal Procedure
4Remove the 4 screws
of the humidifier unit
and lift it up to remove.
5The figure shows the
positions of the
humidifying duct and
the relay connectors.
When installing the
humidifier unit, do not forget
to connect the relay
connectors.
Step Procedure Points
(R13984)
Humidifier unit
Relay
connector
Humidifying
duct
(R13985)

Si001080 Removal of Heater Assembly / Humidifying Rotor / Humidifying Rotor Motor
Removal Procedure 5
2. Removal of Heater Assembly / Humidifying Rotor /
Humidifying Rotor 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. Inside structure of the
humidifier unit
Preparation
Remove the top panel
according to "Removal of
Humidifier Unit".
2. Remove the heater
assembly.
1Remove the 4 screws
of the duct on
adsorption side.
2Release the lead wire
for the humidifying
rotor motor from the
hooks.
Duct
(adsorption side)
Heater
assembly
Humidifier
fan motor
Damper
motor
Humidifying
rotor motor
(R13986)
(R13987)
(R5799)

Removal of Heater Assembly / Humidifying Rotor / Humidifying Rotor Motor Si001080
6Removal Procedure
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.)
3. Remove the humidifying
rotor.
1Release the fan motor
lead wire from the
hooks.
2Remove the bell mouth
on adsorption side.
Step Procedure Points
(R5800)
Fan motor lead wire
(R5805)
Bell mouth
(R13988)

Si001080 Removal of Heater Assembly / Humidifying Rotor / Humidifying Rotor Motor
Removal Procedure 7
3Lift the humidifying
rotor up to remove.
A heat catalyst (black) is
applied on the upper side.
4. Remove the humidifying
rotor motor.
1The figure shows the
connector for the
humidifying rotor
motor.
2Remove the 2 screws
and remove the
humidifying rotor
motor.
Step Procedure Points
Humidifying rotor
(Moisture adsorption
element)
(R13989)
(R5808)
Humidifying rotor
motor
Rotor driving part
(R5809)

Removal of Humidifying Fan Assembly Si001080
8Removal Procedure
3. Removal of Humidifying Fan Assembly
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 humidifying
fan assembly.
Preparation
Remove the humidifier unit
according to "Removal of
Humidifier Unit".
1Peel off the 2 tapes.
2Remove the 5 screws
of the humidifying fan
assembly.
3Unfasten the 2 hooks
while bending the right
side panel.
(R13990)
Humidifying thermistor
Humidifying fan assembly
(R5811)
(R5812)

Si001080 Removal of Humidifying Fan Assembly
Removal Procedure 9
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
2. Remove the damper
assembly.
1Remove the 3 screws.
Step Procedure Points
(R5813)
(R5814)
(R5815)
(R5816)

Removal of Humidifying Fan Assembly Si001080
10 Removal Procedure
2Remove the damper
assembly.
3Remove the screw and
remove the damper
motor.
Step Procedure Points
Damper assembly
(R13991)
Damper motor
(R13992)
Limit switch
(R5819)

Si001080 Removal of Hygroscopic Fan Motor
Removal Procedure 11
4. Removal of Hygroscopic 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
1Remove the nut and
remove the
hygroscopic fan.
Preparation
Remove the humidifying
rotor according to "Removal
of Heater Assembly /
Humidifying Rotor /
Humidifying Rotor Motor".
Nut size: M6
When reassembling, align
the mark of the outdoor
fan with the D-cut section of
the motor shaft.
2Remove the 3 screws
of the motor cover.
3Remove the motor
cover.
4Remove the
hygroscopic fan motor.
Hygroscopic
fan
Nut
(R13993)
10 mm
(R12236)
(R5822)
(R5824)
Hygroscopic
fan motor
Motor cover
(R13994)

Removal of Outdoor Fan / Fan Motor Si001080
12 Removal Procedure
5. Removal of Outdoor Fan / 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 shield plate. Preparation
Remove the humidifier unit
according to "Removal of
Humidifier Unit".
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.
2Open the fixing plate
and release the
harnesses.
3Remove the shield
plate.
2. Remove the electrical box
cover.
1Remove the screw.
Shield plate
(R13995)
(R5826)
(R13996)
(R5828)

Si001080 Removal of Outdoor Fan / Fan Motor
Removal Procedure 13
2Remove the electrical
box cover.
3Remove the insulation
sheet.
3. Remove the front panel.
1Remove the 7 screws.
Unfasten the 5 hooks in
total and remove the
front panel.
2Remove the 4 screws
and remove the front
grille.
Step Procedure Points
(R5829)
(R13997)
Insulation sheet
(R13998)
Hook
Hook
Hook
Front panel
(R14000)
Front grille

Removal of Outdoor Fan / Fan Motor Si001080
14 Removal Procedure
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.
5. Remove the fan motor.
1Disconnect the
connector for the fan
motor [S70].
2Release the fan motor
lead wire from the
hooks.
Step Procedure Points
D cut
(R18411)
10 mm
(R12236)
mark
(R5834)
(R5836)
[S70]
Fan motor lead wire
(R13999)

Si001080 Removal of Outdoor Fan / Fan Motor
Removal Procedure 15
3Remove the screw of
the fan motor fixing
plate.
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
(R14001)
Fan motor fixing plate
(R5839)
(R5840)
(6)
(8)
(7)
(R14002)
(R3249)
Lead wire Outdoor fan

Removal of Humidifying Duct Si001080
16 Removal Procedure
6. Removal of Humidifying Duct
Procedure 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.
(R14003)
Stop valve
cover
(R14004)
Humidifying duct

Si001080 Removal of Electrical Box
Removal Procedure 17
7. 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
1Release the harnesses
for the humidifier unit
from the hook.
Preparation
Remove the front panel
according to "Removal of
Outdoor Fan / Fan Motor".
2Disconnect the
connector for the fan
motor [S70].
3Disconnect the
connector for the
humidifier fan motor
[S72].
4Disconnect the
connector for the four
way valve coil [S80].
(R14005)
(R14006)
[S70]
[S72]
(R14008)
[S80]
(R14007)

Removal of Electrical Box Si001080
18 Removal Procedure
5Disconnect the
connector for the
electronic expansion
valve coil [S20].
6Disconnect the
connector for the
thermistor assembly
[S90].
7Disconnect the
connector for the
humidifying thermistor
[S91].
8Disconnect the 2
terminals from the
reactor.
Step Procedure Points
(R14050)
[S20]
[S90]
(R14009)
(R14051)
(R14053)
Orange
Purple