Daikin RXM09VVJU User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
9000/12000 Btu/h Class
Si002154E

Service Manual
Removal Procedure
Outdoor Unit
Heat Pump
RXM09VVJU
RXM12VVJU

Si002154E
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Outdoor Fan / Fan Motor.........................................................................4
3. Electrical Box ..........................................................................................6
4. PCBs .....................................................................................................12
5. Thermistors ...........................................................................................14
6. Partition Plate / Sound Insulations ........................................................16
7. Electronic Expansion Valve / Four Way Valve......................................18
8. Compressor...........................................................................................21
Note: The illustrations may be slightly different depending on the model.

Outer Panels Si002154E
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 4 screws,
and then the top panel.
2 Remove the 7 screws
of the front panel.
3 Unfasten the 2 hooks
on the right side first,
then unfasten the 3
hooks on the left side
and remove the front
panel.
When reassembling, make
sure that the 5 hooks are
securely fastened.
(R26001)
Top panel
(R26002)
Front panel
(R26003)

Si002154E Outer Panels
Removal Procedure 3
4 Remove the 4 screws
of the discharge grille.
5 Unfasten the 2 hooks
and remove the
discharge grille.
When reassembling, make
sure that the 2 hooks are
securely fastened.
Step Procedure Points
(R26004)
Discharge grille
(R26005)

Outdoor Fan / Fan Motor Si002154E
4Removal Procedure
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 screw,
then slide the shield
plate to the right to
detach the 2 hooks and
remove it.
When reassembling, slide
the shield plate to the left to
make sure the 2 hooks are
securely fastened.
2 Disconnect the
connector [S70].
[S70]: fan motor
3 Release the fan motor
lead wire from the 7
hooks and from the slit
on the electrical box
(R26006)
Shield plate
(R26007)
Hook
(R26008)
[S70]
(R26009)
Hook
Slit Fan motor lead wire

Si002154E Outdoor Fan / Fan Motor
Removal Procedure 5
4 Remove the nut, and
then the outdoor fan.
Nut size: M6
When reassembling, align
the mark of the fan rotor
with the D-cut section of the
motor shaft.
5 Open the 2 hooks and
release the fan motor
lead wire.
When reassembling, make
sure that the 2 hooks are
securely fastened.
6 Remove the 4 screws,
and then the fan motor.
When reassembling, put the
fan motor lead wire through
the back of the fan motor to
avoid any entanglement with
the outdoor fan.
Step Procedure Points
(R26010)
Outdoor fanNut
D-cut
10 mm
(0.39 inch)
(R18954)
Hook
Hook
(R26011)
Fan motor
(R26012)
(R3249)
Lead wire Outdoor fan

Electrical Box Si002154E
6Removal Procedure
3. 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 screw,
then slide the shield
plate to the right to
detach the 2 hooks and
remove it.
When reassembling, slide
the shield plate to the left to
make sure the 2 hooks are
securely fastened.
2 Disconnect the
connector [S70].
[S70]: fan motor
3 Release the fan motor
lead wire from the 7
hooks and from the slit
on the electrical box
(R26006)
Shield plate
(R26007)
Hook
(R26008)
[S70]
(R26009)
Hook
Slit Fan motor lead wire

Si002154E Electrical Box
Removal Procedure 7
4 Disconnect the
connectors [S20] and
[S80].
When reassembling, make
sure to pass the four way
valve harness inside the
overload protector and high
pressure switch connector.
[S20]: electronic expansion
valve coil
[S80]: four way valve
5 Disconnect the
connector [S40] and
detach the snap band.
[S40]: overload protector and
high pressure switch
6 Disconnect the
connectors [S90] and
[S97].
[S90]: thermistors
[S97]: liquid pipe thermistor
Step Procedure Points
[S80][S20]
(R26013)
(R26014)
Overload protector and high
pressure switch connector
Four way valve harness
[S40]
Snap band (R26015)
[S90] [S97]
(R26016)

Electrical Box Si002154E
8Removal Procedure
7 Disconnect the relay
connector for the
compressor.
8
9
Remove the screw of
the stop valve cover.
Slide the stop valve
cover downward and
remove it.
When reassembling, make
sure that the 4 hooks are
securely fastened.
10 Remove the 3 screws.
Step Procedure Points
Relay connector for compressor
(R26017)
Stop valve cover (R26018)
Hook
Hook
(R26019)
(R26020)

Si002154E Electrical Box
Removal Procedure 9
11 Slide the protection
plate up to unfasten the
2 hooks and tilt forward
to remove it.
When reassembling, make
sure that the 2 hooks are
securely fastened.
12
13
Remove the 3 screws.
Slide the conduit
mounting cover up to
unfasten the 2 hooks.
14
15
Loosen the 2 lock nuts
inside conduit mounting
cover and remove 2
conduits.
Pull out the wires to
remove the conduit
mounting cover.
When reassembling, make
sure that the 2 hooks are
securely fastened.
Step Procedure Points
(R26021)
Protection
plate
(R26022)
(R26023)
Conduit
mounting
cover
(R26024)
Conduit
Lock nut
(R26025)

Electrical Box Si002154E
10 Removal Procedure
16 Loosen the 7 screws
and disconnect the
connecting wire and the
power supply wire.
Electrical box can be
removed without removing
the conduit mounting cover.
17 Detach the snap band.
18 Remove the 2 screws
on the right side panel.
Step Procedure Points
(R26026)
Power supply wire
Connecting wire
Terminal strip
(R26027)
Snap band
(R26028)
Right side panel

Si002154E Electrical Box
Removal Procedure 11
19
20
Remove the screw on
the partition plate.
Lift up and remove the
electrical box.
Step Procedure Points
(R26029)
Electrical box
Partition plate

PCBs Si002154E
12 Removal Procedure
4. PCBs
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1 Unfasten the 3 hooks
and remove the
electrical box cover.
The hooks location are
indicated with mark on the
electrical box cover.
When reassembling, make
sure that the 3 hooks are
securely fastened.
2
3
Disconnect the 3
connectors from the
terminal strip.
Remove the earth/
ground screw (green/
yellow).
4 Detach the snap band
for thermistor
assembly.
Top view
Hook
Hook
Electrical box cover
Hook
(R26030)
[HL1] [HN1] [S]
Earth/ground screw (upper) (R26031)
HN1 (white)
Earth/ground
(green/yellow)
HL1 (black) S (red) (R26032)
Bottom view
Snap band
(R26033)

Si002154E PCBs
Removal Procedure 13
5 Remove the 7 screws,
6
7
Lift up the PCB.
Release the
compressor relay
harness from the large
hook inside the
electrical box.
8 Remove the PCB.
Step Procedure Points
(R26034)
(R26035)
Hook
PCB (R26036)

Thermistors Si002154E
14 Removal Procedure
5. Thermistors
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1 Release the outdoor
temperature thermistor
the slit.
When reassembling, pass
the outdoor temperature
thermistor through the top U-
bend of the outdoor heat
exchanger.
2
3
4
Remove the 5 screws.
Lift up the right side
panel to unfasten the 2
hooks.
Remove the right side
panel.
When reassembling, make
sure that the 2 hooks are
securely fastened.
5
6
Cut the clamp.
Pull out the outdoor
heat exchanger
thermistor and liquid
pipe thermistor.
Be careful not to lose the clip
for the thermistor.
Slit Thermistor harness
Outdoor temperature
thermistor holder
Back view
(R26037)
(R26038)
Hook
Hook
Right side panel
(R26039)
(R26040)
Hook
Clamp
Outdoor heat
exchanger
thermistor
Liquid pipe thermistor (R26041)
(R3264)
Clip

Si002154E Thermistors
Removal Procedure 15
7 Open the sound
insulation (top) and
detach the discharge
pipe thermistor.
Be careful not to lose the
fixture for the thermistor.
Step Procedure Points
Sound insulation
(top)
Discharge pipe
thermistor
(R26042)
(R20430)
Fixture

Partition Plate / Sound Insulations Si002154E
16 Removal Procedure
6. Partition Plate / Sound Insulations
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 partition
plate.
When reassembling, fit the
lower hook into the bottom
frame.
1
2
Remove the 2 screws.
Lift up the partition plate
and remove it.
2. Remove the sound
insulation.
Since the piping ports are
torn easily, remove the
sound insulation carefully.
1 Remove the sound
insulation (top).
2 Detach the 2 velcro
tapes, open the sound
insulation (outer sleeve)
and remove it.
(R26043)
Partition plate
Hook
(R26044)
(R26045)
Sound insulation (top)
(R26046)
Velcro tape
Sound insulation (outer sleeve)

Si002154E Partition Plate / Sound Insulations
Removal Procedure 17
3
4
Release the overload
protector harness from
the sound insulation
(inner sleeve) slit.
Remove the sound
insulation (inner
sleeve).
When reassembling, pass
the overload protector
harness through the 2 slits
5 Remove the sound
insulation (bottom).
When reassembling, make
sure that the felt side is
faced upward.
Step Procedure Points
(R26047)
Sound insulation
(inner sleeve)
Slit
Overload
protector harness
(R26048)
Slit
(R26049)
Sound insulation
(bottom)

Electronic Expansion Valve / Four Way Valve Si002154E
18 Removal Procedure
7. Electronic Expansion Valve / Four Way Valve
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Be careful not to get yourself burnt with the pipes and other parts that are heated by
the gas brazing machine.
If the refrigerant gas leaks during work, ventilate the room. (If the refrigerant gas is
exposed to flames, toxic gas may be generated.)
Since it may happen that the refrigerant oil in the compressor catches fire, prepare wet
cloth so as to extinguish fire immediately.
Caution From the viewpoint of global environment protection, do not discharge the refrigerant
gas in the atmosphere. Make sure to collect all the refrigerant gas.
Cautions for restoration
1. Restore the piping by non-oxidation brazing.
2. In order to prevent malfunction or deterioration inside the four way valve or electronic
expansion valve due to overheating, wrap the valve body with a wet cloth and periodically
add water to prevent the cloth from drying. (Ensure that the temperature is below 120°C
(248°F).)
Note Before working, make sure that the refrigerant gas is empty in the circuit.
Be sure to apply nitrogen replacement when heating up the brazed part.
Do not use a metal saw for cutting pipes by all means because the sawdust comes into
the circuit.
When withdrawing the pipes, be careful not to pinch them firmly with pliers. The pipes
may get deformed.
Provide a protective sheet or a steel plate so that the brazing flame cannot influence
peripheries.
Be careful so as not to burn the compressor terminals, the name plate, the outdoor
heat exchanger fin.
In case of difficulty with gas brazing machine
1. Disconnect the brazed part where is easy to disconnect and restore.
2. Cut pipes on the main unit with a tube cutter in order to make it easy to disconnect.
Step Procedure Points
1. Remove the peripheries
beforehand.
1 Remove the following
parts as necessary.
Terminal cover
Protection bushing
Compressor lead
wires
High pressure switch
connectors
Protection bushing
High pressure switch connectors Terminal cover
U (red)
W (blue)
V (yellow)
(R26132)