Daikin 18000 Btu User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
18000/24000 Btu/h Class
Outdoor Unit
Inverter
Pair Type
Si002155E

Service Manual
Removal Procedure
Outdoor Unit
Heat Pump
RXM18VVJU
RXM24VVJU

Si002155E
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Outdoor Fan / Fan Motor.........................................................................5
3. Right Side Panel / Electrical Box.............................................................7
4. PCBs / Thermistor ASSY ......................................................................13
5. Partition Plate / Sound Insulations ........................................................19
6. Electronic Expansion Valve / Four Way Valve......................................21
7. Compressor...........................................................................................24
Note: The illustrations may be slightly different depending on the model.

Outer Panels Si002155E
2Removal Procedure
1. Outer 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 6 screws,
and then the top panel.
2 Loosen the 2 screws of
the protection net.
3 Remove the 8 screws
of the front panel.
The front panel can be
removed without removing
the protection net. Loosen
the 2 screws that fix the
protection net to the front
panel.
Top panel
(R24835)
Protection net
(R24836)
Front panel
(R21948)

Si002155E Outer Panels
Removal Procedure 3
4 Slide the fan motor
fixing frame to the left
and unfasten the 2
hooks.
5
6
Unfasten the 2 hooks
on the right side.
Remove the front panel.
7 Remove the 4 screws
of the discharge grille.
Step Procedure Points
Hook
Fan motor fixing frame
(R21949)
Hook
Front panel
(R24837)
Discharge grille (R21951)

Outer Panels Si002155E
4Removal Procedure
8 Unfasten the 2 hooks
and remove the
discharge grille.
Step Procedure Points
(R21952)

Si002155E Outdoor Fan / Fan Motor
Removal Procedure 5
2. 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 drip proof
cover.
2
3
Disconnect the
connector [S70].
Release the fan motor
lead wire from the 2
hooks.
[S70]: fan motor
4 Remove the nut, and
then the outdoor fan.
Nut size: M8
When reassembling, align
the mark of the fan rotor
with the D-cut section of the
motor shaft.
Drip proof cover
(R24838)
Fan motor lead wire
Hook [S70]
(R26183)
Nut
Outdoor fan
D-cut
(R24841)
13 mm
(0.51 inch)
(R18965)

Outdoor Fan / Fan Motor Si002155E
6Removal Procedure
5 Remove the 2 screws,
and then the fan motor
fixing frame.
When reassembling, fit the 2
lower hooks into the bottom
frame.
When reassembling, fit the
fan motor lead wire into the
slit at the back of the fan
motor fixing frame.
6
7
Cut the clamp.
Unfasten the 3 hooks
on the fan motor fixing
frame and release the
fan motor lead wire.
When reassembling, put the
fan motor lead wire through
the back of the fan motor to
avoid entanglement with the
outdoor fan.
8 Remove the 4 screws,
and then the fan motor.
Step Procedure Points
Fan motor fixing frame
(R24842)
Hook
(R20916)
Fan motor fixing frame Slit
(R21959)
Hook
Fan motor lead wireClamp
(R24843)
Lead wire Outdoor fan
(R3249)
Fan motor
(R21963)

Si002155E Right Side Panel / Electrical Box
Removal Procedure 7
3. Right Side Panel / 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. Remove the right side
panel.
1 Remove the 2 screws
of the terminal cover.
2
3
Open the terminal cover
and pull down to
unfasten the 2 hooks.
Remove the terminal
cover.
4
5
Loosen the 7 screws on
the terminal strip and
disconnect the
connecting wire and
power supply wire.
Loosen the 2 nuts of the
conduits and remove
the connecting wire and
power supply wire.
Terminal cover
(R24844)
(R26184)
Hook
Terminal strip
Nut
Conduit
Connecting wire Power supply wire (R24846)

Right Side Panel / Electrical Box Si002155E
8Removal Procedure
6 Remove the 2 screws
at the right side panel.
The right side panel can be
removed without removing
the conduit mounting plate.
7
8
Remove the screw of
the stop valve cover.
Slide the stop valve
cover downward and
remove it.
When reassembling, make
sure that the 3 hooks are
securely fastened.
9
10
Pull out the outdoor
temperature thermistor
holder.
Remove the outdoor
temperature thermistor
harness from the slit.
Step Procedure Points
Conduit
mounting
plate
(R24847)
Stop valve cover
(R24848)
Hook
Hook
(R26185)
Slit Thermistor harness
Outdoor temperature thermistor holder (R24849)

Si002155E Right Side Panel / Electrical Box
Removal Procedure 9
11 Remove the 5 screws
of the right side panel.
12 Unfasten the 4 hooks
and remove the right
side panel.
When reassembling, make
sure to fit the rear hook.
2. Remove the electrical
box.
[S70]: fan motor
1
2
Disconnect the
connector [S70].
Release the fan motor
lead wire from the 2
hooks.
Step Procedure Points
Right side
panel
(R26186)
Hook
Hook
Hook
(R24851)
Hook
(R21317)
Hook [S70]
Fan motor lead wire (R26187)

Right Side Panel / Electrical Box Si002155E
10 Removal Procedure
3 Disconnect the
connector [S80] and
pull out snap band.
[S80]: four way valve coil
4 Disconnect the
connector [S20] and
pull out the snap band.
[S20]: electronic expansion
valve coil
5 Detach the snap band
and disconnect the
connector [S40].
[S40]: overload protector/high
pressure switch
Step Procedure Points
Snap band
[S80]
(R26188)
(R26189)
[S20]
Snap band
(R26190)
[S40]
Snap band

Si002155E Right Side Panel / Electrical Box
Removal Procedure 11
6 Disconnect the relay
connector for
compressor.
7 Open the sound
insulation (top) and
detach the discharge
pipe thermistor.
Be careful not to lose the
fixture for the thermistor.
8 Cut the clamp, pull
out the outdoor heat
exchanger thermistor
and liquid pipe
thermistor.
Be careful not to lose the clip
for the thermistor
Step Procedure Points
(R26191)
Relay connector
(R26192)
Sound insulation (top)Discharge pipe thermistor
Fixture
(R21395)
Clamp
Outdoor heat
exchanger thermistor
Liquid pipe thermistor
(R26193)
(R20852)
Clip

Right Side Panel / Electrical Box Si002155E
12 Removal Procedure
9
10
Remove the screw on
the partition plate.
Lift up and remove the
electrical box.
Step Procedure Points
Electrical box
Partition plate (R26194)

Si002155E PCBs / Thermistor ASSY
Removal Procedure 13
4. PCBs / Thermistor ASSY
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 service
monitor PCB.
The service monitor PCB
can be removed without
removing the electrical box.
When reassembling, make
sure that the 2 hooks are
securely fastened.
1
2
Remove the screw.
Unfasten the 2 hooks
and remove the switch
cover.
3 Unfasten the 4 hooks
and remove the service
monitor PCB cover.
When reassembling, make
sure that the 4 hooks are
securely fastened.
4 Disconnect the 2
connectors [S501] and
[S502] from the service
monitor PCB.
[S501], [S502]: main PCB
Switch cover
Right view
(R26195)
Hook
(R24861)
Hook
Hook
Service monitor PCB cover
(R26196)
[S501] [S502]
(R26197)

PCBs / Thermistor ASSY Si002155E
14 Removal Procedure
5 Unfasten the 4
projections and remove
the service monitor
PCB.
2. Remove the main PCB.
1 Remove the earth/
ground screw.
2
3
Pull out the snap band.
Remove the 2 screws
of the terminal
mounting plate.
When finished the withstand
voltage test, make sure that
the harness is inside the
right side panel.
Step Procedure Points
Projection Service monitor PCB Projection
(R26198)
(R26199)
Earth/ground screw
Front view
Right view
Snap band
Withstand voltage harness (R26200)

Si002155E PCBs / Thermistor ASSY
Removal Procedure 15
4 Unfasten the hook and
open upward the
terminal mounting
plate.
When reassembling, make
sure that the hook is
securely fastened.
5 Pull out harnesses from
the hole.
6 Disconnect the 3
terminals for connection
and the 4 terminals for
power supply.
Before pulling out the
terminals, confirm the
terminal locations.
Step Procedure Points
(R26201)
HookTerminal mounting plate
(R26202)
Hole
Harness
Terminal for connection
Terminal for power supply
(R26203)
Black
Terminal for connection
White Red
(R24870)
Black
BlueBrown
White
Terminal for power supply
(R24871)

PCBs / Thermistor ASSY Si002155E
16 Removal Procedure
7 Detach the 2 snap
bands and release the
harness of power
supply.
8
9
Detach the 3 snap
bands to release the
harness for relay
connector.
Detach the snap band
to release the relay
harness for
compressor.
10 Disconnect the
connectors [S90] and
[S].
[S90]: thermistors
[S]: power supply
Step Procedure Points
(R26204)
Snap band
(R26205)
Snap
band
Snap band
(R26206)
[S] [S90]

Si002155E PCBs / Thermistor ASSY
Removal Procedure 17
11 Remove the 8 screws
of the main PCB.
12 Lift up the top of the
PCB to unfasten the 4
hooks.
13 Remove the main PCB.
Step Procedure Points
(R26207)
Hook (R26208)
Main PCB (R26209)

PCBs / Thermistor ASSY Si002155E
18 Removal Procedure
3. Remove the thermistor
ASSY.
1
2
Pull out the 2 snap
bands and cut the
clamp.
Remove the thermistor
ASSY.
Step Procedure Points
(R26210)
Clamp
Snap band
Thermistor ASSY
Snap band