Daikin RKM18PVMK User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
18000/24000/28000 Btu/h Class
Outdoor Unit
Inverter
Pair Type
Si001559E

Service Manual
Removal Procedure
Outdoor Unit
zCooling Only zHeat Pump
RKM18PVMK RXM18PVMK
RKM24PVMK RXM24PVMK
RKM28PVMK RXM28PVMK

Si001559E
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Outdoor Fan / Fan Motor.........................................................................6
3. Electrical Box ..........................................................................................8
4. PCBs .....................................................................................................11
5. Fan Motor for Cooling Electrical Box / Thermistor ASSY......................14
6. Partition Plate / Sound Blankets............................................................15
7. Electronic Expansion Valve Coil / High Pressure Switch /
Four Way Valve.....................................................................................17
8. Compressor...........................................................................................20
Note: The illustrations may be slightly different depending on the model.
The illustrations are for heat pump models as representative.

Outer Panels Si001559E
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 remove the top
panel.
2 Remove the 3 screws
of the terminal cover.
3 Unfasten the 2 hooks
and remove the
terminal cover.
When reassembling, make
sure that the 2 hooks are
securely fastened.
Top panel
(R22195)
Terminal
cover
(R22196)
Hook
(R22197)
(R22198)

Si001559E Outer Panels
Removal Procedure 3
4
5
Remove the 2 screws.
Pull the partition plate
(2) forward then slide to
the right and remove it.
When reassembling, slide
the partition plate (2) to the
left to securely fasten the 2
hooks.
6 Release the outdoor
temperature thermistor
from the holder and the
slit.
7 Remove the 8 screws
of the right side panel.
Step Procedure Points
Partition
plate (2)
(R22199)
Hook
(R22200)
Slit
Holder
Outdoor temperature thermistor
(R22201)
Right side panel (R22202)

Outer Panels Si001559E
4Removal Procedure
8 Unfasten the hook and
remove the right side
panel.
9 Remove the 6 screws
of the front panel.
10
11
Unfasten the 3 hooks
on the left side.
Remove the front panel.
When reassembling, make
sure that the 3 hooks are
securely fastened.
Step Procedure Points
Hook
Right side panel
(R22203)
Front panel
(R22204)
Hook
Hook
(R22205)

Si001559E Outer Panels
Removal Procedure 5
12 Remove the 4 screws
of the discharge grille.
13 Unfasten the 5 hooks
and remove the
discharge grille.
Step Procedure Points
Discharge grille
(R22206)
Hook
Discharge grille
Hook
(R22207)

Outdoor Fan / Fan Motor Si001559E
6Removal 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 electrical
box cover.
2 Disconnect the
connector [S70] and
release the fan motor
lead wire from the slit.
[S70]: fan motor
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 Remove the nut and
remove the outdoor fan.
Nut size : M8
When reassembling, align
the mark of the fan rotor
with the D-cut section of the
motor shaft.
Electrical box cover
(R22208)
Fan motor lead wire [S70]
Slit
(R22209)
Lead wire Outdoor fan
(R3249)
Outdoor fan
Nut
D-cut
(R22210)
13 mm
(0.51 inch)
(R18965)

Si001559E Outdoor Fan / Fan Motor
Removal Procedure 7
4 Remove the 2 screws
and remove the fan
motor fixing frame.
When reassembling, fit the 2
lower hooks into the bottom
frame.
5 Unfasten the 3 hooks
on the fan motor fixing
frame and release the
fan motor lead wire.
6 Remove the 4 screws
and remove the fan
motor.
Step Procedure Points
Fan motor fixing frame
(R22211)
Hook (R22212)
Hook
Fan motor lead wire
(R20917)
Fan motor (R20918)

Electrical Box Si001559E
8Removal 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 3 screws
and remove the wire
fixture.
2 Remove the 7 screws
on the terminal board
and disconnect the
connecting wire and
power supply wire.
3 Disconnect the
connector [S20] and
pull out the clamp.
[S20]: electronic expansion
valve coil
Wire fixture
(R22213)
Connecting wire
Terminal board
Power supply wire
(R22214)
[S20]
Clamp
(R22215)

Si001559E Electrical Box
Removal Procedure 9
4 Disconnect the
connector [S80] and
pull out the clamp.
[S80]: four way valve coil
The cooling only models
have no harness for [S80].
5 Disconnect the relay
connector for
compressor and pull out
the clamp.
6 Disconnect the
connector [S40] and
pull out the clamp.
[S40]: overload protector
Step Procedure Points
[S80]
Clamp
(R22216)
Clamp Relay connector
(R22217)
[S40]
Clamp (R22218)

Electrical Box Si001559E
10 Removal Procedure
7 Open the sound blanket
(top) and detach the
discharge pipe
thermistor.
Be careful not to lose the
fixture for the thermistor.
8 Cut the clamp and pull
out the outdoor heat
exchanger thermistor.
Be careful not to lose the clip
for the thermistor.
9 Remove the 3 screws
and remove the
electrical box.
Step Procedure Points
Sound blanket (top) Discharge pipe thermistor
(R22219)
Fixture
(R22220)
Clamp
Outdoor heat
exchanger
thermistor
(R22221)
Clip
(R3264)
Electrical box
(R22222)

Si001559E PCBs
Removal Procedure 11
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 terminal
board mounting plate
ASSY.
1 Push the 2 projections
of the clamps from the
back of the electrical
box and pull them out.
2 Remove the earth /
ground screw.
3 Disconnect the 3
terminals for power
supply.
[HL1], [HN1], [S]: to terminal
board
Projection of
clamp
(R22223)
Earth / ground
screw
(R22224)
[S]
[HN1]
[HL1]
(R22225)

PCBs Si001559E
12 Removal Procedure
4 Disconnect the
connector [S90].
[S90]: thermistors
5 Disconnect the
connector [S100].
[S100]: fan motor for cooling
electrical box
6 Remove the 4 screws
of the terminal board
mounting plate ASSY.
Step Procedure Points
[S90]
(R22226)
[S100]
(R22227)
Terminal board
mounting plate
ASSY
(R22228)

Si001559E PCBs
Removal Procedure 13
7 Slide the terminal board
mounting plate ASSY
up to unfasten the hook
and remove it.
When reassembling, make
sure to fasten the hook with
the notch.
2. Remove the PCB.
1
2
Remove the 9 screws
of the PCB.
Unfasten the 3 hooks
and remove the PCB.
Step Procedure Points
Hook
(R22229)
Hook (R22230)
PCB
(R22231)

Fan Motor for Cooling Electrical Box / Thermistor ASSY Si001559E
14 Removal Procedure
5. Fan Motor for Cooling Electrical Box / 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 fan motor for
cooling electrical box.
1 Pull out the clamp and
remove the 3 screws.
2 Remove the fan motor
for cooling electrical
box.
2. Remove the thermistor
ASSY.
1Pull out the 5 clamps
and remove the
thermistor ASSY.
Clamp
(R22232)
Fan motor for cooling
electrical box
(R22233)
Clamp
Clamp Thermistor ASSY
Back
(R22234)

Si001559E Partition Plate / Sound Blankets
Removal Procedure 15
6. Partition Plate / 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 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
blankets.
1 Remove the sound
blanket (top).
2 Open and pull out the
sound blanket (outer).
Since piping ports are torn
easily, remove the sound
blanket carefully.
Partition plate (R22235)
Hook
(R22236)
Sound blanket (top)
(R22237)
Sound blanket (outer) (R22238)

Partition Plate / Sound Blankets Si001559E
16 Removal Procedure
3 Remove the sound
blanket (inner).
Step Procedure Points
Sound blanket (inner) (R22239)

Si001559E Electronic Expansion Valve Coil / High Pressure Switch / Four Way Valve
Removal Procedure 17
7. Electronic Expansion Valve Coil / High Pressure
Switch / 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
remove the four way
valve coil.
The cooling only models
have no four way valve.
Four way
valve coil
(R22240)

Electronic Expansion Valve Coil / High Pressure Switch / Four Way Valve Si001559E
18 Removal Procedure
2 Pull out the electronic
expansion valve coil.
3 Pull out the high
pressure switch.
4 Remove the terminal
cover.
Step Procedure Points
Electronic
expansion
valve coil
(R22241)
High pressure
switch
(R22242)
Terminal cover
(R22243)