Daikin RK18NMVJU User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
15000/18000/24000 Btu/h Class
Si001555EC

Service Manual
Removal Procedure
Outdoor Unit
Cooling Only Heat Pump
RK18NMVJU RX18NMVJU
RK24NMVJU RX24NMVJU
RKN24NMVJU RX15QMVJU
RX18QMVJU
RX15RMVJU
RX18RMVJU
RX18RMVJU9
RX24RMVJU
RXN18NMVJU
RXN24NMVJU
RXL15QMVJU

Si001555EC
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Outdoor Fan / Fan Motor.........................................................................4
3. Electrical Box ..........................................................................................7
4. PCB.......................................................................................................11
5. Thermistor ASSY / Partition Plate .........................................................14
6. Sound Blankets .....................................................................................17
7. Electronic Expansion Valve / Four Way Valve......................................19
8. Compressor...........................................................................................22
Note: The illustrations may be slightly different depending on the model.
The illustrations are for heat pump models as representative.

Outer Panels Si001555EC
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 8 screws
of the front panel.
3 Slide the fan motor
fixing frame to the left
and unfasten the 2
hooks.
Top panel
(R21947)
Front panel
(R21948)
Hook
Fan motor fixing frame
(R21949)

Si001555EC Outer Panels
Removal Procedure 3
4
5
Unfasten the 2 hooks
on the right side.
Remove the front panel.
6 Remove the 4 screws
of the discharge grille.
7 Unfasten the 2 hooks
and remove the
discharge grille.
Step Procedure Points
Hook
Front panel
(R21950)
Discharge grille (R21951)
(R21952)

Outdoor Fan / Fan Motor Si001555EC
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 drip proof
cover.
2 Remove the 2 screws
of the terminal cover.
3
4
Open the terminal cover
and pull down to
unfasten the 2 hooks.
Remove the terminal
cover.
Drip proof cover
(R21953)
Terminal cover
(R21954)
Hook
(R21955)

Si001555EC Outdoor Fan / Fan Motor
Removal Procedure 5
5 Disconnect the
connector [S70].
[S70]: fan motor
6 Pull out the clamp of the
fan motor lead wire (on
the outer side of the
electrical box).
7 Release the fan motor
lead wire from the
groove and unfasten
the 2 hooks.
When reassembling, fit the
fan motor lead wire into the
slit at the back of the fan
motor fixing frame.
Step Procedure Points
[S70]
(R21956)
Top view
Clamp
Fan motor
lead wire
Clamp
(R21957)
Hook Fan motor lead wireGroove
(R21958)
Fan motor fixing frame Slit
(R21959)

Outdoor Fan / Fan Motor Si001555EC
6Removal Procedure
8 Remove the nut and
remove the outdoor fan.
Nut size : M8
9 Remove the 2 screws
and remove the fan
motor fixing frame.
When reassembling, fit the 2
lower hooks into the bottom
frame.
10 Unfasten the 3 hooks
on the fan motor fixing
frame and release the
fan motor lead wire.
11 Remove the 4 screws
and remove the fan
motor.
Step Procedure Points
Outdoor fan
Nut (R21960)
13 mm
(0.51 inch)
(R18965)
Fan motor fixing frame
(R21961)
Hook
(R20916)
Hook
Fan motor lead wire
(R21962)
Fan motor
(R21963)

Si001555EC Electrical Box
Removal Procedure 7
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
2
Remove the 7 screws
on the terminal board
and disconnect the
connecting wire and
power supply wire.
Loosen the 2 nuts of the
conduits and remove
the connecting wire and
power supply wire.
3 Remove the 2 screws
and remove the conduit
mounting plate.
When reassembling, fit the 2
hooks of the conduit
mounting plate to the right
side panel.
4 Remove the 2 screws.
Power
supply
wire
Connecting wire
Nut
Conduit
Terminal board
(R21964)
Conduit
mounting
plate
(R21965)
Hook
Right side
panel
(R21966)
(R20921)

Electrical Box Si001555EC
8Removal Procedure
5 Disconnect the
connector [S80] and
pull out the clamp (Hole
No.1).
[S80]: four way valve coil
The cooling only models
have no harness for [S80].
When reassembling,
connect the connectors in
the following order. Be sure
to insert the wiring clamps of
lead wires into the
appropriate holes.
(1) [S90]: Hole No.15, 14,
13, 7, 3
(2) [S40]: Hole No.16, 2
(3) [S20]: Hole No.11
(4) [S80]: Hole No.1
6 Disconnect the
connector [S20] and
pull out the clamp (Hole
No.11).
[S20]: electronic expansion
valve coil
7
8
Pull out the clamp (Hole
No.16) and disconnect
the connector [S40].
Pull out the clamp (Hole
No.2).
Step Procedure Points
[S80]
Clamp (R21967)
14
151617
13
Hole No. for wiring clamps
1 3 5 7 9 11
2 4 6 8 10 12
(R21996)
[S20]
Clamp
(R21968)
Clamp
Clamp
[S40]
(R21998)
[S40]: overload protector

Si001555EC Electrical Box
Removal Procedure 9
9 Pull out the clamp (Hole
No.15) and disconnect
the connector [S90].
[S90]: thermistors
10 Pull out the 3 clamps
(Hole No.3, 7, and 13).
11 Pull out the clamp from
the Hole No.14 and
release the outdoor
temperature thermistor
harness from the slit.
12 Remove the outdoor
temperature thermistor.
The design of the outdoor
temperature thermistor
varies depending on the
model.
Step Procedure Points
[S90]
Clamp
(R21999)
Clamp
(R21969)
Outdoor temperature
thermistor harness
Slit Clamp
(R21970)
Outdoor temperature
thermistor
(R20927)

Electrical Box Si001555EC
10 Removal Procedure
13 Disconnect the relay
connector for
compressor.
14 Remove the screw and
remove the electrical
box.
Step Procedure Points
Relay connector (R21971)
Electrical box
(R21972)

Si001555EC PCB
Removal Procedure 11
4. 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 screw of
the terminal board.
2 Remove the earth /
ground screw.
3 Pull out the clamp (1)
and cut the clamp (2).
Terminal board
(R21973)
Earth / ground screw (R21974)
Clamp (2) Clamp (1)
(R21975)

PCB Si001555EC
12 Removal Procedure
4 Remove the earth /
ground screw.
5 Cut the clamp (1) (Hole
No.5), pull out the
clamp (2) (Hole No.12),
and release the relay
harness from the hook.
6 Remove the 3 screws
of the mounting plate
for terminal board.
Step Procedure Points
Earth / ground screw
(R21976)
Relay harness
Hook
Clamp (1)
Clamp (2)
(R21977)
Mounting plate for
terminal board (R21978)

Si001555EC PCB
Removal Procedure 13
7 Remove the 7 screws
of the PCB.
8 Unfasten the key hook,
and then the other 5
hooks.
9 Remove the PCB.
Step Procedure Points
PCB (R20935)
Hook
Key hook
(R21997)
PCB
(R20937)

Thermistor ASSY / Partition Plate Si001555EC
14 Removal Procedure
5. Thermistor ASSY / 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 right side
panel.
1 Remove the screw of
the stop valve cover.
2 Slide the stop valve
cover downward and
remove it.
When reassembling, make
sure to fit the 3 hooks.
3 Remove the 4 screws
of the right side panel.
Stop valve cover
(R21979)
(R21980)
Hook
Hook
(R20940)
Right side panel
(R20941)

Si001555EC Thermistor ASSY / Partition Plate
Removal Procedure 15
4 Unfasten the 4 hooks
and remove the right
side panel.
When reassembling, make
sure to fit the rear hook.
2. Remove the thermistor
ASSY.
Be careful not to lose the clip
for the thermistor.
1 Cut the clamp and pull
out the outdoor heat
exchanger thermistor.
2 Open the sound blanket
(top) and detach the
discharge pipe
thermistor.
Be careful not to lose the
fixture for the thermistor.
Step Procedure Points
Right side
panel
Hook
HookHook (R21981)
Hook
(R21317)
Clamp
Outdoor heat
exchanger
thermistor
(R21982)
(R20852)
Clip
Sound blanket
(top)
Discharge
pipe thermistor
(R21983)
Fixture
(R21395)

Thermistor ASSY / Partition Plate Si001555EC
16 Removal Procedure
3 Remove the thermistor
ASSY.
3. Remove the partition
plate.
1 Pull out the clamp.
2 Remove the 2 screws
and remove the
partition plate.
When reassembling, fit the
lower hook into the bottom
frame.
Step Procedure Points
Thermistor ASSY
(R20945)
Clamp
(R21984)
Partition plate
(R21985)
Hook Bottom frame (R20947)

Si001555EC Sound Blankets
Removal Procedure 17
6. 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 (back).
Since the piping ports are
torn easily, remove the
sound blanket carefully.
2 Remove the sound
blanket (top).
3 Open and pull up the
sound blanket (outer).
Sound blanket
(back)
(R21986)
Sound blanket (top)
(R21987)
Sound blanket (outer)
(R21988)

Sound Blankets Si001555EC
18 Removal Procedure
4 Remove the sound
blanket (inner).
When reassembling, fit the
sound blankets in the
following order.
(1) inner
(2) outer
(3) back
(4) top
Step Procedure Points
Sound blanket (inner)
(R21989)