Daikin RKC18QV2S User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
4.0/5.0/6.0/7.1 kW Class
18000/24000/28000 Btu/h Class
Outdoor Unit
Inverter
Pair Type
Si001658EA

Service Manual
Removal Procedure
Outdoor Unit
zCooling Only
RKC18QV2S
RKC24QV2S
RKC28QV2S
RKC50QVM
RKC60QVM
RKC71QVM
RKC50QVM4
RKC60QVM4
RKC71QVM4
RKC50QVMV
RKC60QVMV
RKC71QVMV
zHeat Pump
RHM50HVMV
RHM60HVMV
RHM71HVMV
RHP40HVLT
RHP50HVLT
RXF50QVMA
RXF60QVMA

Si001658EA
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Outdoor Fan / Fan Motor.........................................................................4
3. Electrical Box ..........................................................................................6
4. PCBs .....................................................................................................10
5. Thermistor ASSY ..................................................................................12
6. Partition Plate / Sound Blankets............................................................14
7. Electronic Expansion Valve...................................................................16
8. Four Way Valve.....................................................................................18
9. Compressor...........................................................................................20
Note: The illustrations may be slightly different depending on the model.

Outer Panels Si001658EA
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 4 screws,
and then the top panel.
2 Remove the 7 screws
of the front panel.
3 Unfasten the 2 hooks
on the right side first,
then unfasten the 3
hooks on the left side
and remove the front
panel.
When reassembling, make
sure that the 5 hooks are
securely fastened.
(R23694)
Top panel
(R23695)
Front panel
(R23696)

Si001658EA Outer Panels
Removal Procedure 3
4 Remove the 4 screws
of the discharge grille.
5 Unfasten the 6 hooks
and remove the
discharge grille.
When reassembling, make
sure that the 6 hooks are
securely fastened.
Step Procedure Points
(R23697)
Discharge grille
(R23698)

Outdoor Fan / Fan Motor Si001658EA
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 Cut the clamp and pull
out the sealing material.
2 Disconnect the
connector [S79].
[S79]: fan motor
3 Release the fan motor
lead wire from the 2
slits and from the 4
hooks on the electrical
box.
When reassembling, put the
fan motor lead wire through
the back of the fan motor to
avoid any entanglement with
the outdoor fan.
(R23699)
Sealing material Clamp
(R23700)
[S79]
(R23701)
Slit
Hook
Fan motor lead wire
(R3249)
Lead wire Outdoor fan

Si001658EA Outdoor Fan / Fan Motor
Removal Procedure 5
4 Remove the nut, and
then the outdoor fan.
Nut size: M6
When reassembling, align
the mark of the fan rotor
with the D-cut section of the
motor shaft.
5
6
Remove the screw of
the fan motor fixing
frame.
Unfasten the 2 hooks at
the bottom and remove
the fan motor fixing
frame.
When reassembling, fit the 2
lower hooks into the bottom
frame.
7 Open the 2 hooks and
release the fan motor
lead wire.
8 Remove the 4 screws,
and then the fan motor.
Step Procedure Points
Outdoor fanNut
D-cut
(R23702)
10 mm
(0.39 inch)
(R18954)
Fan motor fixing frame
(R23703)
(R22574)
Hook
Fan motor lead wire
Back view
(R23704)
Fan motor
Front view
(R24357)

Electrical Box Si001658EA
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 Disconnect the
connector [S80] and
release the harness
from the clamp.
The electrical box can be
removed without removing
the fan motor.
[S80]: four way valve
Cooling only models do not
have the connector [S80].
2 Disconnect the
connector [S20] and
release the harness
from the clamp.
[S20]: electronic expansion
valve coil
3 Disconnect the
connector [S40].
[S40]: overload protector
[S80] Clamp
(R23706)
[S20] Clamp
(R23707)
[S40]
(R23708)

Si001658EA Electrical Box
Removal Procedure 7
4 Disconnect the
connector [S90] and cut
the clamp.
[S90]: thermistors
5 Disconnect the relay
connector for the
compressor.
6
7
Remove the screw of
the stop valve cover.
Slide the stop valve
cover downward and
remove it.
When reassembling, make
sure that the 4 hooks are
securely fastened.
Step Procedure Points
[S90]
Clamp
(R23709)
Relay connector for compressor (R23710)
Stop valve cover (R23711)
Hook
Hook
(R23712)

Electrical Box Si001658EA
8Removal Procedure
8 Remove the 3 screws,
and then the wire
fixture.
9 Remove the 7 screws
on the terminal strip
and disconnect the
connecting wire and the
power supply wire.
10 Remove the 2 screws
on the right side panel.
Step Procedure Points
(R23713)
Wire fixture
Connecting wire Power supply wire
Terminal strip
(R24514)
Right side panel
(R23715)

Si001658EA Electrical Box
Removal Procedure 9
11
12
Remove the screw on
the partition plate.
Lift up and remove the
electrical box.
Step Procedure Points
Electrical box
Partition plate
(R23716)

PCBs Si001658EA
10 Removal Procedure
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
2
Remove the screw.
Unfasten the 2 hooks
and remove the
electrical box cover.
The locations of the hooks
are indicated with mark
on the electrical box cover.
When reassembling, make
sure that the 2 hooks are
securely fastened.
3
4
Disconnect the 3
connectors from the
terminal strip.
Remove the earth/
ground screw (upper).
When reassembling, put all
the wires through the hole of
the electrical box.
[HL1] [HN1] [S]: terminal strip
5 Cut the 2 clamps.
Top view Electrical box cover Hook
Hook (R23717)
HN1HL1
Earth/ground screw (upper)
Hole
Terminal strip S
(R24358)
HN1 (white)
HL1 (black) S (red)
(R23719)
Clamp
Bottom view
(R23720)

Si001658EA PCBs
Removal Procedure 11
6 Disconnect the relay
connector for the fan
motor.
7 Remove the 7 screws,
and then the main PCB.
8
9
Turn over the electrical
box.
Pinch the 4 clamps and
remove the clamp PCB.
Step Procedure Points
Relay connector for fan motor
(R23721)
Top view
(R23722)
Main PCB
(R23723)
(R24359)
Clamp PCB
Clamp
Clamp
Bottom view

Thermistor ASSY Si001658EA
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 Pull out the outdoor
temperature thermistor
holder and release the
thermistor wire from the
slit.
When reassembling, pass
the outdoor temperature
thermistor through the top U-
bend of the outdoor heat
exchanger.
2
3
4
Remove the 5 screws.
Lift 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.
Some models do not have
the clamp.
The location of the outdoor
heat exchanger thermistor
varies depending on the
model.
Be careful not to lose the clip
for the thermistor.
5
6
Cut the clamp.
Pull out the outdoor
heat exchanger
thermistor.
Back view Slit Thermistor wire
Outdoor temperature
thermistor holder (R23724)
(R20243)
Right side panel
Hook
(R23725)
(R3264)
Clip
Outdoor heat
exchanger
thermistor
Clamp
(R23726)

Si001658EA Thermistor ASSY
Removal Procedure 13
7 Open the sound blanket
(top) and detach the
discharge pipe
temperature thermistor.
Be careful not to lose the
fixture for the thermistor.
8 Remove the thermistor
ASSY.
Step Procedure Points
Sound blanket
(top)
Discharge pipe
temperature
thermistor
(R23727)
(R20430)
Fixture
(R23728)
Thermistor ASSY

Partition Plate / Sound Blankets Si001658EA
14 Removal Procedure
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.
Since the piping ports are
torn easily, remove the
sound blanket carefully.
Some models do not have
the sound blanket (partition
plate).
1 Remove the sound
blanket (partition plate).
2 Remove the sound
blanket (top).
(R23729)
Partition plate
Hook
(R23730)
(R23731)
Sound blanket (partition plate)
Sound blanket (top)
(R23732)

Si001658EA Partition Plate / Sound Blankets
Removal Procedure 15
3 Cut the strings and
open the sound blanket
(outer).
4 Remove the sound
blanket (outer).
5 Remove the sound
blanket (inner).
Step Procedure Points
Sound blanket (outer)
(R24360)
(R24361)
Sound blanket (inner)
(R23735)

Electronic Expansion Valve Si001658EA
16 Removal Procedure
7. Electronic Expansion 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.)
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 Pull out the electronic
expansion valve coil.
Electronic expansion
valve coil
(R23736)

Si001658EA Electronic Expansion Valve
Removal Procedure 17
2 Remove the terminal
cover.
3
4
Remove the protection
bushing.
Disconnect the
compressor lead wires
(U, V, W) and the
overload protector.
5
6
7
Cut the clamp.
Remove the putties.
Heat up the 2 brazed
parts and remove the
electronic expansion
valve.
Step Procedure Points
Terminal cover
(R23737)
Protection bushing
U (red)
Overload
protector
V (yellow) W (blue) (R23738)
Clamp
Electronic expansion
valve
Putty
Brazed part (R23739)

Four Way Valve Si001658EA
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 Remove the screw, and
then the four way valve
coil.
Cooling only models do not
have four way valve.
Four way valve coil
(R23740)