Daikin RKM20QVMA User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
2.0/2.2/2.5/2.8/3.5 kW Class
Si001653EA

Service Manual
Removal Procedure
Outdoor Unit
zCooling Only zHeat Pump
RKM20QVMA RXF25QVMA
RKM25QVMA RXF35QVMA
RKM35QVMA
RXM20QVMA
RXM25QVMA
RXM35QVMA
RXV25QVMV
RXV35QVMV
RXV22RVLT
RXV28RVLT

Si001653EA
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Outdoor Fan / Fan Motor.........................................................................3
3. Electrical Box / PCB ................................................................................5
4. Suction Grille / Protection Net / Thermistor ASSY ................................10
5. Sound Blankets .....................................................................................13
6. Partition Plate / Electronic Expansion Valve Coil ..................................14
7. Four Way Valve.....................................................................................15
8. Compressor...........................................................................................18
Note: The illustrations may be slightly different depending on the model.
The illustrations are for heat pump models as representative.

Outer Panels Si001653EA
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 4 screws,
and then the top panel.
Remove the 5 screws
of the front panel.
3
4
Lift up the left side of
the front panel and
unfasten the 3 hooks.
Unfasten the 2 right
side hooks and remove
the front panel.
5
6
Turn the discharge
grille to the left to
unfasten the 6 hooks.
Remove the discharge
grille.
Front panel
Top panel
(R22824)
(R22825)
Hook
Discharge grille
Hook
(R22826)

Si001653EA Outdoor Fan / Fan Motor
Removal Procedure 3
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
2
Disconnect the
connector [S70].
Release the fan motor
lead wire from the
groove.
[S70]: 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.
3 Remove the nut, and
then the outdoor fan.
Nut size: M6
When reassembling, align
the mark of the outdoor
fan with the D-cut section of
the motor shaft.
4 Remove the 2 screws,
and then the fan motor
fixing frame.
When reassembling, fit the 2
lower hooks into the bottom
frame.
Groove
Fan motor lead wire
[S70]
(R22827)
Lead wire Outdoor fan
(R3249)
Outdoor fan
Nut
(R22828)
10 mm
(0.39 inch)
(R18954)
Fan motor fixing frame
(R22829)
Hook (R21610)

Outdoor Fan / Fan Motor Si001653EA
4Removal Procedure
5 Unfasten the 3 hooks
on the fan motor fixing
frame and release the
fan motor lead wire.
6 Remove the 4 screws
from the fan motor.
7 Remove the fan motor.
Step Procedure Points
Hook
Fan motor lead wire
(R21612)
Fan motor
(R24108)
(R22830)

Si001653EA Electrical Box / PCB
Removal Procedure 5
3. 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 shield plate. When reassembling, make
sure to fit the 4 hooks.
1
2
Remove the screw of
the stop valve cover.
Slide the stop valve
cover downward and
remove it.
3 Remove the screw of
the shield plate.
4 Lift up the shield plate
and unfasten the 2
hooks to remove it.
Stop valve
cover
(R22831)
Hook
(R22832)
Shield plate
(R22833)
Hook
(R22834)

Electrical Box / PCB Si001653EA
6Removal Procedure
2. Remove the electrical
box.
1: black, back
2: white, back
3: red, front
1 Disconnect the 3
connectors from the
terminal board.
2 Disconnect the
connector [S80].
[S80]: four way valve coil
Cooling only models have no
harness for [S80].
3 Disconnect the
connector [S40].
[S40]: overload protector
Step Procedure Points
Connector
(R22835)
[S80]
(R22836)
[S40]
(R22837)

Si001653EA Electrical Box / PCB
Removal Procedure 7
4 Disconnect the
connector [S20].
[S20]: electronic expansion
valve coil
5 Disconnect the
connector [S90] and
pull out the clamp.
[S90]: thermistors
6 Disconnect the relay
connector for
compressor and
remove the harness
from the wire clip.
When reassembling, make
sure the compressor
harness passes through the
wire clip.
Step Procedure Points
[S20] (R22838)
[S90] Clamp (R22839)
Wire clipRelay connector for compressor
(R24109)

Electrical Box / PCB Si001653EA
8Removal Procedure
7 Remove the 2 screws
of the electrical box.
8 Lift up the electrical box
and remove it.
When reassembling, make
sure to fit the rear hook.
3. Remove the PCB.
1 Remove the earth/
ground screw.
Step Procedure Points
(R22841)
(R22842)
Hook
(R24110)
Back view
Earth/ground screw
(R24111)

Si001653EA Electrical Box / PCB
Removal Procedure 9
2
3
Remove the 5 screws
of the PCB.
Unfasten the 2 hooks
and release the 2
spacers.
4 Remove the PCB.
Step Procedure Points
Hook
Spacer
(R22845)
PCB
(R22846)

Suction Grille / Protection Net / Thermistor ASSY Si001653EA
10 Removal Procedure
4. Suction Grille / Protection Net / 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 outdoor
temperature thermistor
from the suction grille
(or from the protection
net).
When reassembling, make
sure to pass the outdoor
temperature thermistor
through the top part of the
heat exchanger first.
2 Remove the 3 screws,
and then the suction
grille.
For models with protection
net
Lift up the protection net and
remove it.
3
4
Slide the left side of the
suction grille to the right
and unfasten the 2 left
hooks.
Unfasten the 3 right
side hooks and remove
the suction grille.
Outdoor temperature thermistor
Suction grille (R22847)
Top part of the heat exchanger
(R22848)
Suction grille
(R22849)
Protection net
(R22850)
Hook
Hook
(R22851)

Si001653EA Suction Grille / Protection Net / Thermistor ASSY
Removal Procedure 11
5
6
Remove the 7 screws
on the terminal board
and disconnect the
connecting wire and the
power supply wire.
Remove the 3 screws,
and then the wire
fixture.
7
8
Remove the earth/
ground screw.
Remove the 5 screws.
For models with protection
net
Remove the 6 screws.
9
10
Lift up the right side
panel to unfasten the 2
hooks.
Remove the right side
panel.
When reassembling, make
sure to fit the rear hook.
Step Procedure Points
Power supply wire
Terminal board
Connecting
wire
Wire fixture
(R22852)
Earth/
ground
screw
(R24112)
(R22854)
Hook
Right side
panel
(R22855)
Hook
(R21317)

Suction Grille / Protection Net / Thermistor ASSY Si001653EA
12 Removal Procedure
11 Open the sound blanket
(top) and pull out the
discharge pipe
temperature thermistor.
Be careful not to lose the
fixture for the thermistor.
12
13
Cut the clamp.
Pull out the outdoor
heat exchanger
thermistor and remove
the thermistor ASSY.
The location of the
thermistor is different
depending on the model.
Be careful not to lose the clip
for the thermistor.
Step Procedure Points
Discharge pipe
temperature
thermistor
(R22856)
(R20854)
Fixture
Clamp
Outdoor heat
exchanger
thermistor
(R22857)
Thermistor ASSY
(R22858)
(R20852)
Clip

Si001653EA Sound Blankets
Removal Procedure 13
5. 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).
The design of the sound
blankets varies depending
on the model.
Since the piping ports on the
sound blanket are torn
easily, remove the blanket
carefully.
2 Detach the fastener and
pull out the sound
blanket (outer).
3 Pull out the sound
blanket (inner).
Sound blanket
(top)
(R22859)
Sound blanket
(outer)
(R22860)
Sound blanket
(inner)
(R22861)

Partition Plate / Electronic Expansion Valve Coil Si001653EA
14 Removal Procedure
6. Partition Plate / Electronic Expansion Valve Coil
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 2 screws
of the partition plate.
2 Lift up the partition plate
and remove it.
When reassembling, fit the
hook on the bottom frame.
3 Remove the electronic
expansion valve coil.
(R22862)
Partition plate
(R22863)
Hook
(R22864)
Electronic expansion
valve coil
(R22865)

Si001653EA Four Way Valve
Removal Procedure 15
7. 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 Remove the screw, and
then the four way valve
coil.
Cooling only models have no
four way valve coil.
Four way valve coil
(R22866)

Four Way Valve Si001653EA
16 Removal Procedure
2 Remove the terminal
cover.
3
4
Remove the protection
bushing.
Disconnect the
compressor lead wires
(U, V, W) and the
overload protector.
5 Remove the 2 putties.
Step Procedure Points
Terminal cover
(R22867)
U (red)
V (yellow)
W (blue)
Overload protector
Protection
bushing
(R22868)
Putty
(R22869)

Si001653EA Four Way Valve
Removal Procedure 17
6 Heat up the 4 brazed
parts and remove the
four way valve.
Step Procedure Points
Four way valve
Brazed part
(R22870)

Compressor Si001653EA
18 Removal Procedure
8. Compressor
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.
Restore the piping by non-oxidation brazing.
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 terminal
cover.
Terminal cover
(R22867)