Daikin RKS22MVLT User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
2.2/2.8/3.6 kW Class
Si001354EA

Service Manual
Removal Procedure
Outdoor Unit
zCooling Only zHeat Pump
RKS22MVLT RXM22NVLT
RKS28MVLT RXM28NVLT
RKS36MVLT RXM36NVLT
RXS22MVLT
RXS28MVLT
RXS36MVLT

Si001354EA
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Outdoor Fan / Fan Motor.........................................................................5
3. Electrical Box ..........................................................................................7
4. PCBs .......................................................................................................9
5. Reactor / Partition Plate ........................................................................13
6. Sound Blankets .....................................................................................14
7. Thermistor ASSY ..................................................................................15
8. Four Way Valve.....................................................................................16
9. Compressor...........................................................................................19
Note: The illustrations may be slightly different depending on the model.
The illustrations are for heat pump models as representative.

Outer Panels Si001354EA
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 remove the top
panel.
Remove the 4 screws
and remove the
discharge grille.
Slide the discharge grille
upward and remove it.
The discharge grille has 6
hooks.
3 Remove the 7 screws
of the front panel.
4
5
Unfasten the 2 right
side hooks.
Unfasten the 3 left side
hooks and remove the
front panel.
When reassembling, fit the
left side of the front panel
first.
Discharge grille
(R18934)
Top panel
(R14278)
(R14283)
Front panel
(R18935)

Si001354EA Outer Panels
Removal Procedure 3
6
7
Remove the screw of
the stop valve cover.
Pull down the stop
valve cover to unfasten
the hooks and remove
it.
The stop valve cover has 3
hooks.
8 Remove the 3 screws
and remove the wire
fixture.
9 Remove the 7 screws
and remove the
connecting wire and the
power supply wire.
Step Procedure Points
Stop valve cover (R18936)
(R18937)
Wire fixture
(R18938)
(R18939)
Connecting
wire
Power supply
wire

Outer Panels Si001354EA
4Removal Procedure
10 Pull out the outdoor
temperature thermistor.
11 Remove the 7 screws
of the right side panel.
12
13
Unfasten the 2 lower
hooks and the upper
hook.
Remove the right side
panel.
When reassembling, insert
the 2 lower hooks and the
upper hook of the back.
Step Procedure Points
(R14300)
Outdoor temperature
thermistor
Right side panel
(R18940)
Hook
(R14303)
(R18941)
Hook

Si001354EA Outdoor Fan / Fan Motor
Removal Procedure 5
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 shield
plate.
2 Disconnect the
connector [S70].
[S70]: fan motor
3 Release the fan motor
lead wire from the hook.
4 Remove the nut of the
outdoor fan.
Nut size: M6
When reassembling, align
the mark of the outdoor
fan with the D-cut section of
the motor shaft.
(R18942)
Shield plate
[S70] (R15680)
(R18943)
Fan motor
lead wire
Hook
Nut
(R18944)
Outdoor fan
10 mm
(0.39 inch)
(R18954)

Outdoor Fan / Fan Motor Si001354EA
6Removal Procedure
5 Remove the screw of
the fan motor fixing
frame.
6
7
Unfasten the 2 hooks at
the bottom.
Remove the fan motor
fixing frame.
When reassembling, fit the 2
lower hooks into the bottom
frame.
8 Open the 2 hooks and
release the fan motor
lead wire.
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.
9 Remove the 4 screws
and remove the fan
motor.
Step Procedure Points
(R18945)
Fan motor fixing frame
Hook (R18946)
(R11835)
(R3249)
Lead wire Outdoor fan
(R19106)
Fan motor

Si001354EA 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 Disconnect the
connector [S80].
The cooling only models
have no harness for [S80].
[S80]: four way valve coil
2 Disconnect the
connector [S20].
[S20]: electronic expansion
valve coil
3 Disconnect the 2
connectors for the
reactor.
When reassembling, you
can connect the 2 harnesses
in either way regardless of
the color.
[S80]
(R17144)
(R12590)
[S20]
(R12586)

Electrical Box Si001354EA
8Removal Procedure
4 Disconnect the relay
connector for the
compressor.
5 Disconnect the
connector [S40].
[S40]: overload protector
6 Disconnect the
connector [S90].
[S90]: thermistors
When reassembling,
connect the connectors in
the following order.
(1) [S90]
(2) [S40]
(3) compressor relay
(4) reactor
(5) [S20]
(6) [S70]
(7) [S80]
7 Lift and remove the
electrical box.
Step Procedure Points
(R19075)
(R19076)
[S40]
[S90]
(R19077)
(R13179)
Electrical box

Si001354EA 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 main PCB. You can remove the main
PCB after you disconnect
the lead wires on the
terminal board without
removing the electrical box.
Be careful of a sharp
protrusion at the back of the
forced operation button
PCB.
[S110]: main PCB
1
2
Pull out the forced
operation button PCB.
Disconnect the
connector [S110] and
remove the forced
operation button PCB.
3 Cut the 3 clamps.
4 Release the harnesses
from the 2 hooks.
5 Disconnect the
connector [S10].
[S10]: filter PCB
Forced operation button PCB
(R13742)
[S110]
(R12594)
(R19074)
Hook
(R12596)
[S10]

PCBs Si001354EA
10 Removal Procedure
6 Disconnect the
connector [HL3].
[HL3]: filter PCB (orange)
7 Disconnect the
connector [HN3].
[HN3]: filter PCB (blue)
8 Remove the 6 screws.
9
10
Unfasten the 2 hooks
on the lower side.
Lift and remove the
main PCB.
The electrical box has also 2
hooks on the upper side.
When reassembling, be sure
to fit all the 4 hooks.
Step Procedure Points
(R12598)
[HL3]
(R12599)
[HN3]
(R12600)
(R22507)
Hook

Si001354EA PCBs
Removal Procedure 11
2. Remove the filter PCB.
1 Remove the 2 screws
and release the earth /
ground wires.
2 Disconnect the
connectors from the
terminal board.
1 : black, back
2:white,back
3 : red, front
: yellow / green, back
3 Release the harnesses
from the groove.
Step Procedure Points
(R22508)
Earth /
ground
wire
(R22509)
Terminal board
(R12606)

PCBs Si001354EA
12 Removal Procedure
4 Release the harnesses
from the hook.
5
6
Remove the screw.
Unfasten the 2 hooks
and remove the filter
PCB.
Step Procedure Points
(R12607)
(R18658)
Filter PCB
Hook

Si001354EA Reactor / Partition Plate
Removal Procedure 13
5. 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. Remove the reactor. When reassembling, make
sure to catch the hook.
1
2
Remove the screw and
slide the reactor to the
left to unfasten the
hook.
Remove the reactor.
2. Remove the partition
plate.
1 Remove the 3 screws.
2 The partition plate has
a hook on the lower
side. Lift and pull the
partition plate and
remove it.
When reassembling, fit the
lower hook into the bottom
frame.
Reactor
Hook
(R22510)
(R18984)
Partition plate
Hook (R22511)

Sound Blankets Si001354EA
14 Removal Procedure
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
2
Untie the string and
open the sound blanket
(outer).
Pull out the sound
blanket (outer).
Since the piping ports are
torn easily, remove the
sound blanket carefully.
3 Remove the sound
blanket (top).
4 Pull out the sound
blanket (inner).
5Pull out the sound
blanket (bottom).
(R15888)
Sound blanket (outer)
(R12617)
Sound blanket
(top)
(R12618)
Sound blanket (inner)
Sound blanket
(bottom) (R11888)

Si001354EA Thermistor ASSY
Removal Procedure 15
7. 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 Release the discharge
pipe thermistor.
Be careful not to lose the
fixture for the thermistor.
2 Cut the clamp. The position of the clamp
and outdoor heat exchanger
thermistor varies by model.
3 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
(R12619)
(R18949)
Fixture
(R22512)
Clamp
Outdoor heat exchanger thermistor (R22513)
Thermistor
ASSY
Clip
(R3264)

Four Way Valve Si001354EA
16 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
1Pull out the electronic
expansion valve coil.
The cooling only models
have no four way valve.
(R7233)
Electronic
expansion
valve coil

Si001354EA Four Way Valve
Removal Procedure 17
2 Remove the terminal
cover.
3
4
5
Disconnect the lead
wires of the
compressor.
Remove the overload
protector.
Remove the protection
bushing.
6 Remove the screw and
remove the four way
valve coil.
Step Procedure Points
(R7234)
Terminal cover
V
W
U
(R18951)
Red (U)
Yellow (V) Blue (W)
Overload
protector Protection
bushing
(R22514)
Four way valve coil

Four Way Valve Si001354EA
18 Removal Procedure
7 Remove the sheets of
putty.
The position of the sheets of
putty varies by model.
8 Heat up the 4 brazed
parts and withdraw the
piping with pliers.
Step Procedure Points
(R7248)
(R7249)
Four way valve
(R7250)