Daikin RKM20PVMA User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
2.0/2.5/3.5 kW Class
Outdoor Unit
Inverter
Pair Type
Si001420E

Service Manual
Removal Procedure
Outdoor Unit
zCooling Only zHeat Pump
RKM20PVMA RXJ25PVMA
RKM25PVMA RXJ35PVMA
RKM35PVMA
RXM20PVMA
RXM25PVMA
RXM35PVMA

Si001420E
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Outdoor Fan / Fan Motor.........................................................................4
3. Electrical Box ..........................................................................................6
4. PCBs .......................................................................................................9
5. Thermistor ASSY ..................................................................................15
6. Reactor / Partition Plate ........................................................................16
7. Sound Blankets .....................................................................................17
8. Four Way Valve.....................................................................................18
9. Compressor...........................................................................................20
Note: The illustrations may be slightly different depending on the model.
The illustrations are for heat pump models as representative.

Outer Panels Si001420E
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 3 screws
and remove the top
panel.
2 Remove the drip proof
cover.
3 Remove the 4 screws
of the discharge grille.
Top panel
(R21214)
Drip proof cover
(R21215)
(R21216)
Discharge grille

Si001420E Outer Panels
Removal Procedure 3
4 Unfasten the 4 hooks
and remove the
discharge grille.
5 Remove the 8 screws
of the front panel.
6 Unfasten the 4 hooks
and remove the front
panel.
When reassembling, make
sure to fit the 4 hooks.
Step Procedure Points
Discharge grille (R21217)
(R21218)
Front panel (R21219)

Outdoor Fan / Fan Motor Si001420E
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].
[S70]: fan motor
2 Release the outdoor
temperature thermistor
from the protection net
and pull out from the
top U-bend pipe of
outdoor heat
exchanger.
When reassembling, make
sure to pass the outdoor
temperature thermistor
through the top U-bend pipe
and the slit, then fix it at the
holder.
3 Release the fan motor
lead wire from the
groove and the hook.
[S70]
(R21220)
Outdoor temperature thermistor
Protection net
(R21221)
Slit
Top U-bend pipe (R21222)
Hook Fan motor
lead wire
Groove
(R21223)

Si001420E Outdoor Fan / Fan Motor
Removal Procedure 5
4
5
Remove the nut of the
outdoor fan.
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.
6 Remove the screw and
remove the fan motor
fixing frame.
When reassembling, fit the
lower 2 hooks into the
bottom frame.
7 Release the fan motor
lead wire from the 2
hooks.
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.
8 Remove the 4 screws
and remove the fan
motor.
Step Procedure Points
Outdoor fan
Nut
(R21224)
10 mm
(0.39 inch)
(R18954)
Fan motor fixing frame
(R21225)
(R21226)
Hook
(R21227)
(R3249)
Lead wire Outdoor fan
Fan motor
(R21228)

Electrical Box Si001420E
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 right side
panel.
When reassembling, make
sure to fit the 5 hooks.
1
2
Remove the screw.
Slide the stop valve
cover downward and
remove it.
3
4
5
Remove the 3 screws
and remove the wire
fixture.
Remove the 7 screws
on the terminal board
and detach the
connecting wire and the
power supply wire.
Remove the 4 screws
and detach the demand
communication wire.
When reassembling, fasten
the demand communication
wire with the clamp to the
wire fixture.
6 Remove the 7 screws
and remove the right
side panel.
Stop valve cover (R21229)
(R21230)
Power supply
wire
Connecting wire
Demand
communication
wire Wire fixture
Terminal
board
(R21231)
123
(R21256)
Clamp
Right side panel
(R21232)

Si001420E Electrical Box
Removal Procedure 7
2. Remove the electrical
box.
The cooling only models
have no harness for four way
valve coil.
1 Disconnect the relay
connector for four way
valve coil.
2 Disconnect the relay
connector for electronic
expansion valve coil.
The cooling only models
have no relay connector for
electronic expansion valve
coil, disconnect the
connector [S20] instead.
3 Disconnect the
connectors for the
reactor.
4 Disconnect the relay
connector for
compressor.
Step Procedure Points
(R21233)
(R21234)
Connector for the reactor
(R21235)
(R21236)

Electrical Box Si001420E
8Removal Procedure
5 Disconnect the
connector [S90].
[S90]: thermistors
6 Disconnect the
connector [S40].
[S40]: overload protector
7 Lift up the electrical box
and remove it.
When reassembling,
connect the connectors in
the reverse order.
Step Procedure Points
[S90]
(R21237)
[S40]
(R21238)
Electrical box
(R21239)

Si001420E PCBs
Removal Procedure 9
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. Remove the demand
control PCB.
The demand controller is an
optional accessory for
cooling only models.
1 Unfasten the 2 hooks of
the cover for the
demand controller and
remove it.
2 Disconnect the
connectors [S201],
[S203], [S206].
The demand controller as an
optional accessory has
[S204] and [S205] instead of
[S206].
[S201]: terminal board
[S203]: main PCB
[S206] or [S204][S205]: smart
meter
3 Remove the screw and
remove the demand
control PCB.
When reassembling, make
sure to fit the hook on the
bottom of the demand
control PCB.
Hook
Hook
Cover for
demand
controller
(R21240)
[S201]
[S206]
[S203]
(R21241)
Demand
control
PCB
Hook
(R21242)

PCBs Si001420E
10 Removal Procedure
2. Remove the main PCB.
1 Cut the 3 clamps.
2 Release the wires from
the 3 hooks.
3 Disconnect the
connectors [S100],
[S10], [HL3], [HN3].
[S100]: forced operation button
PCB
[S10][HL3][HN3]: filter PCB
Step Procedure Points
Clamp
Clamp
(R21243)
Hook
Hook (R21244)
[S10]
[S100]
[HL3] [HN3]
(R21245)

Si001420E PCBs
Removal Procedure 11
4 Release the wires from
the hook.
5
6
Remove the 6 screws.
Unfasten the 4 hooks
and remove the main
PCB.
Step Procedure Points
Hook
(R21246)
Hook
Hook (R21247)
Main PCB
(R21248)

PCBs Si001420E
12 Removal Procedure
3. Remove the filter PCB.
1 Remove the 2 screws
and detach the earth /
ground wires.
2 Remove the screw and
remove the terminal
board.
3 Release the wires from
the 2 hooks.
Inside view
Hook A:
• Harnesses connecting the
main PCB and the filter PCB
(blue, orange, white, black)
• Reactor harness (brown)
Hook B:
• Harnesses for terminal board
(black, white, red)
• Earth / ground harness (green)
Step Procedure Points
Earth /
ground
screw
(R21249)
(R21250)
Hook
(R21251)
Hook B Hook A
(R21261)

Si001420E PCBs
Removal Procedure 13
4 Release the wires from
the hook.
When reassembling, make
sure to insert the earth /
ground wire first.
5
6
Remove the screw.
Unfasten the 2 hooks
and remove the filter
PCB.
Step Procedure Points
Hook
(R21252)
Earth /
ground wire
(R21262)
Hook
(R21253)
(R21254)

PCBs Si001420E
14 Removal Procedure
4. Remove the forced
operation button PCB.
1 Unfasten the hook on
the back and remove
the forced operation
button PCB.
Step Procedure Points
Forced
operation
button PCB
Hook
(R21255)
(R21257)

Si001420E Thermistor ASSY
Removal Procedure 15
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
2
Slightly open the sound
blanket (top).
Release the discharge
pipe thermistor.
Be careful not to lose the
fixture for the thermistor.
3
4
Cut the clamp.
Pull out the outdoor
heat exchanger
thermistor and remove
the thermistor ASSY.
Be careful not to lose the clip
for the thermistor.
Discharge pipe
thermistor
Sound blanket
(top)
(R21258)
Fixture
(R21275)
Clamp
Outdoor heat
exchanger
thermistor
(R21259)
Thermistor ASSY
(R21260)
Clip
(R3264)

Reactor / Partition Plate Si001420E
16 Removal Procedure
6. Reactor / 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
2
Remove the screw.
Slide the reactor to the
left and remove it.
3 Remove the 2 screws
and remove the
partition plate.
Heat exchanger side view When reassembling, fit the
lower hook into the bottom
frame.
Reactor
(R21263)
Partition plate
(R21264)
Hook
(R21265)

Si001420E Sound Blankets
Removal Procedure 17
7. Sound Blankets
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
blanket (top).
Since the piping ports are
torn easily, remove the
sound blankets carefully.
2 Untie the string and pull
out the sound blanket
(outer).
3 Pull out the sound
blanket (inner).
4 Remove the sound
blanket (bottom).
Sound blanket (top)
(R21266)
Sound blanket (outer) (R21267)
Sound blanket (inner)
(R21268)
Sound blanket (bottom) (R21269)

Four Way Valve Si001420E
18 Removal Procedure
8. 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
(R21270)