Daikin RXL12QMVJU User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
12000 Btu/h Class
Si001655E

Service Manual
Removal Procedure
Outdoor Unit
zHeat Pump
RXL12QMVJU

Si001655E
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Outdoor Fan / Fan Motor.........................................................................4
3. Drain Pan Heater (Option) ......................................................................6
4. Electrical Box / PCB ................................................................................8
5. Thermistor ASSY ..................................................................................12
6. Sound Blankets / Partition Plate............................................................16
7. Electronic Expansion Valve Coil / Four Way Valve...............................18
8. Compressor...........................................................................................21

Outer Panels Si001655E
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
2
Remove the 3 screws
and remove the top
panel.
Remove the 4 screws
of the front panel.
3
4
Unfasten the 3 left side
hooks, and then the 2
right side hooks.
Remove the front panel.
When reassembling, make
sure that the 5 hooks are
securely fastened.
5 Remove the 4 screws.
Top panel
Front panel
(R22821)
Hook
Hook
(R20379)
(R20380)

Si001655E Outer Panels
Removal Procedure 3
6 Unfasten the 2 hooks
on the top and remove
the discharge grille.
Step Procedure Points
Hook
Discharge
grille
(R20381)

Outdoor Fan / Fan Motor Si001655E
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 Disconnect the
connector [S70] and
remove the filament
tape.
[S70]: fan motor
2 Release the fan motor
lead wire from the
groove.
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.
3
4
Remove the nut of the
outdoor fan.
Remove the outdoor
fan.
Nut size: M6
Align the mark of the
outdoor fan with the D-cut
section of the motor shaft
when reassembling.
Filament tape [S70]
(R20382)
Groove Fan motor lead wire (R20383)
Lead wire Outdoor fan
(R3249)
D-cut
Outdoor fan
Nut
(R20384)
10 mm
(0.39 inch)
(R18954)

Si001655E Outdoor Fan / Fan Motor
Removal Procedure 5
5 Remove the 2 screws
and remove the fan
motor fixing frame.
When reassembling, fit the 2
lower hooks into the bottom
frame.
6 Open the 3 hooks and
release the fan motor
lead wire.
7 Remove the 3 screws
from the fan motor.
8 Remove the fan motor.
Step Procedure Points
Fan motor fixing frame
(R20385)
Hook (R21610)
Hook
Fan motor lead wire
(R21612)
Fan motor
(R21613)
(R20826)

Drain Pan Heater (Option) Si001655E
6Removal Procedure
3. Drain Pan Heater (Option)
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1 Disconnect the 2
connectors from the
terminal board.
1: black, back
2: white, back
2 Remove the screw from
the partition plate.
3 Remove the 3 screws.
White
Black
(R20386)
Partition plate
(R20387)
(R20388)

Si001655E Drain Pan Heater (Option)
Removal Procedure 7
4 Lift the outdoor heat
exchanger slightly
upward and pull the
drain pan heater
forward to remove it.
Be careful not to get cut by
heat exchanger fins.
Step Procedure Points
Outdoor heat exchanger
(R20389)
Drain pan heater
(R20390)

Electrical Box / PCB Si001655E
8Removal Procedure
4. Electrical Box / PCB
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 electrical
box.
1: black, front
2: white, front
3: red, front
When reassembling, wind
the earth / ground wire
around other wires and fix
them with a clamp.
Make sure the wires do not
touch the four way valve.
1 Cut the clamp and
disconnect the 3
connectors from the
terminal board.
2 Remove the screw and
detach the earth /
ground wire.
3 Disconnect the
connector [S80].
[S80]: four way valve coil
Connector
Clamp
(R20391)
Four way valve
Earth / ground wire (R20393)
Earth / ground wire
(R20392)
[S80]
(R20394)

Si001655E Electrical Box / PCB
Removal Procedure 9
4 Disconnect the
connector [S20].
[S20]: electronic expansion
valve coil
5 Disconnect the
connector [S40].
[S40]: overload protector
6 Disconnect the relay
connector for
compressor.
Step Procedure Points
[S20] (R20395)
[S40]
(R20396)
Relay connector
(R20397)

Electrical Box / PCB Si001655E
10 Removal Procedure
7 Disconnect the
connector [S90].
[S90]: thermistors
8 Pull out the clamp from
the bottom.
9 Remove the screw and
lift up the electrical box
to remove it.
When reassembling, make
sure to catch the hook at the
top back of the electrical
box.
Step Procedure Points
[S90] (R20398)
Clamp (R20399)
Electrical box
(R20400)
Hook
(R20401)

Si001655E Electrical Box / PCB
Removal Procedure 11
2. Remove the PCB.
1 Remove the earth /
ground screw.
2
3
Remove the 5 screws
of the PCB.
Unfasten the 2 spacers
and the 3 hooks from
the PCB.
4 Remove the PCB.
Step Procedure Points
Earth / ground screw (R20402)
Hook
Hook
Spacer
(R20403)
PCB
(R20404)

Thermistor ASSY Si001655E
12 Removal Procedure
5. 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 screw of
the stop valve cover.
2 Slide the stop valve
cover downward and
remove it.
When reassembling, make
sure that the 4 hooks are
securely fastened.
3 Remove the 2 screws
and lift up the protection
plate to remove it.
When reassembling, make
sure to fit the 2 hooks at the
back of the protection plate.
Stop valve cover
(R20405)
Hook
(R20406)
Protection plate
(R20407)
Hook
(R20408)

Si001655E Thermistor ASSY
Removal Procedure 13
4 Remove the 2 screws
and open the conduit
mounting plate cover to
the left, then remove it.
The conduit mounting plate
cover has a hook on the left
and a projection on top. Be
sure to catch them all when
reassembling.
5 Remove the 7 screws
on the terminal board
and disconnect the
connecting wire and the
power supply wire.
6 Pull out the outdoor
temperature thermistor
holder.
Step Procedure Points
Projection
Conduit
mounting
plate cover
Hook
(R21632)
Projection
Hook
(R20409)
Connecting wire
Power supply
wire
Terminal
board
(R21633)
Outdoor temperature thermistor holder
(R20410)

Thermistor ASSY Si001655E
14 Removal Procedure
7 Remove the 3 screws
of the right side panel.
8
9
Slide 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.
10
11
Cut the clamp.
Pull out the outdoor
heat exchanger
thermistor.
Be careful not to lose the clip
for the thermistor.
Step Procedure Points
Right side
panel
(R21634)
Hook
(R20411)
Clamp
Outdoor heat exchanger
thermistor
(R20412)
Clip
(R20852)

Si001655E Thermistor ASSY
Removal Procedure 15
12 Open the sound blanket
(top) and pull out the
discharge pipe
temperature thermistor.
Be careful not to lose the
fixture for the thermistor.
13 Remove the thermistor
ASSY.
Step Procedure Points
Discharge pipe
temperature thermistor
Sound blanket (top)
(R20413)
Fixture
(R22352)
Thermistor ASSY
(R20414)

Sound Blankets / Partition Plate Si001655E
16 Removal Procedure
6. Sound Blankets / Partition Plate
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 sound
blankets.
Since the piping ports on the
sound blanket are torn
easily, remove the blanket
carefully.
1 Remove the sound
blanket (top).
2 Detach the fastener and
pull out the sound
blanket (outer).
3 Pull out the sound
blanket (inner).
Sound blanket (top)
(R20415)
Sound blanket (outer)
(R20416)
Sound blanket (inner)
(R20417)

Si001655E Sound Blankets / Partition Plate
Removal Procedure 17
2. Remove the partition
plate.
1 Remove the 2 screws.
2 Lift up the partition plate
and remove it.
When reassembling, fit the
hook on the bottom frame.
Step Procedure Points
(R20418)
Partition plate
(R20419)
Hook
(R20864)

Electronic Expansion Valve Coil / Four Way Valve Si001655E
18 Removal Procedure
7. Electronic Expansion Valve Coil / 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.)
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. It is required to prevent the carbonization of the oil inside the four way valve and the
deterioration of the gaskets affected by heat. (Keep below 120°C (248°F).) For the sake of
this, wrap the four way valve with wet cloth and provide water so that the cloth does not
dry.
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 Pull out the electronic
expansion valve coil.
Electronic
expansion
valve coil
(R20420)