Daikin RKN25KEVM User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
2.5/3.5 kW Class
Si001170

Service Manual
Removal Procedure
Outdoor Unit
Applicable Models
zCooling Only
RKN25KEVM
RKN35KEVM

Si001170
Removal Procedure 1
Table of Contents
1. Removal of Outer Panels ........................................................................2
2. Removal of Outdoor Fan / Fan Motor .....................................................4
3. Removal of Electrical Box / PCB.............................................................7
4. Removal of Sound Blankets..................................................................16
5. Removal of Electronic Expansion Valve ...............................................18
6. Removal of Compressor .......................................................................19
Note: The illustrations may be slightly different depending on the model.

Removal of Outer Panels Si001170
2Removal Procedure
1. Removal of Outer Panels
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
1. Appearance features
Take care not to cut your
finger by the fins of the
outdoor heat exchanger.
2. Remove the panels.
1Remove the 3 screws
(right: 1 screw, left: 2
screws) and remove the
top panel.
2Remove the 6 screws
of the front panel.
3Unfasten the right side
hooks and remove the
front panel.
(R14852)
(R14853)
(R14854)
Top panel
Front panel
(R14855)

Si001170 Removal of Outer Panels
Removal Procedure 3
4Unfasten the 10 hooks
and remove the
discharge grille.
Step Procedure Points
(R14856)
Discharge grille

Removal of Outdoor Fan / Fan Motor Si001170
4Removal Procedure
2. Removal of Outdoor Fan / Fan Motor
Procedure 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 fan. Preparation
Remove the panels
according to the “Removal
of Outer Panels”.
Nut size: M8
1
2
Remove the nut of the
outdoor fan.
Remove the outdoor
fan.
When reassembling, align
the mark of the outdoor
fan with the D-cut section of
the motor shaft.
2. Remove the fan motor.
1Disconnect the
connector for the fan
motor [S70]. Release
the fan motor lead wire
from the hook.
2Release the fan motor
lead wire from the
hooks.
When reassembling, pass
the fan motor lead wire
along the groove and hooks.
(R14857)
Shaft
D-cut
Nut
Outdoor
fan
13 mm
(R15266)
(R14858)
[S70] Hook
(R14859)

Si001170 Removal of Outdoor Fan / Fan Motor
Removal Procedure 5
3Peel the sealing
material and remove
the 2 upper screws.
4Remove the 2 lower
screws.
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.
5Remove the fan motor
fixing frame.
Step Procedure Points
(R14860)
Sealing
material
Fan motor fixing frame
(R14861)
(R3249)
Lead wire Outdoor fan
(R14862)

Removal of Outdoor Fan / Fan Motor Si001170
6Removal Procedure
6Turn over the fan motor
fixing frame and cut the
2 clamps.
Do not cut the clamp A.
When reassembling, place
the clamp Aunder the
clamp B.
7Release the fan motor
lead wire.
8Remove the 4 screws
and remove the fan
motor.
Step Procedure Points
(R14863)
(R14865)
Clamp B
Clamp A
(R14864)
(R14866)
Fan motor

Si001170 Removal of Electrical Box / PCB
Removal Procedure 7
3. Removal of Electrical Box / PCB
Procedure 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.
Preparation
Remove the panels
according to the “Removal
of Outer Panels”.
1Unhook the outdoor
temperature thermistor.
2Remove the 2 screws
and remove the
terminal cover.
3Remove the screw and
remove the stop valve
cover.
4Remove the screws
and disconnect the
connecting wires.
5Remove the 3 screws
and remove the wire
clamp.
(R14867)
Outdoor temperature thermistor
Stop valve
cover
Terminal cover
(R14868)
(R14869)
(R14870)
Wire clamp

Removal of Electrical Box / PCB Si001170
8Removal Procedure
6Remove the 2 screws
on the rear side of the
right side panel.
7Remove the 5 screws
on the right side panel.
8Lift the electrical box.
Step Procedure Points
(R14871)
Right side panel
(R14872)
(R14873)
Electrical
box

Si001170 Removal of Electrical Box / PCB
Removal Procedure 9
9Unfasten the 3 hooks,
and remove the right
side panel.
When reassembling, make
sure to fit the hook.
2. Remove the electrical box. 1 : black, upper
2 : white, lower
3 : red, upper
: green, lower
1Pull out the terminals
from the terminal board.
2Remove the screw and
release the earth wire.
Step Procedure Points
(R14874)
Right side
panel
Red
Earth
Black
White (R14875)
(R14876)
Earth

Removal of Electrical Box / PCB Si001170
10 Removal Procedure
3Disconnect the
connector for the fan
motor [S70]. Release
the fan motor lead wire
from the hook.
4Release the fan motor
lead wire from the
hooks.
5Disconnect the
connector for the
overload protector
[S40].
6Disconnect the
connectors [S20] [S90].
[S20]: electronic expansion
valve
[S90]: thermistors
Step Procedure Points
(R14877)
[S70] Hook
(R14878)
[S40]
(R14879)
[S90] [S20]
(R14880)

Si001170 Removal of Electrical Box / PCB
Removal Procedure 11
7Release the harnesses
of [S20] and [S90] from
the groove.
8Disconnect the relay
connector.
9Disconnect the 2
terminals of the reactor.
10 Release the harnesses
of the reactor and the
relay connector from
the groove.
Step Procedure Points
(R14881)
(R14882)
(14883)
Orange
Reactor
Brown
(R14884)

Removal of Electrical Box / PCB Si001170
12 Removal Procedure
11 Release the harnesses
of the terminals and the
earth wire from the
groove.
12 Remove the electrical
box cover and the
insulation sheet.
13 Remove the 5 screws.
14 Unfasten the hook.
Step Procedure Points
(R14885)
(R14886)
Electrical box cover
Insulation
sheet
(R14887)
(R14888)

Si001170 Removal of Electrical Box / PCB
Removal Procedure 13
15 Remove the PCB.
[S20]: electronic expansion
valve
[S40]: overload protector
[S70]: fan motor
[S90]: thermistors
16 Remove the 2 screws.
17 Remove the electrical
box.
Step Procedure Points
(R14889)
PCB
(R14890)
[S90] [S40] [S20] [S70]
(R14891)
(R14892)
Electrical
box

Removal of Electrical Box / PCB Si001170
14 Removal Procedure
3. Remove the reactor.
1Remove the 3 screws
of the reactor.
2Remove the reactor.
4. Remove the thermistor
ASSY.
Be careful not to lose the
clip for the thermistor.
1Remove the discharge
pipe thermistor.
Step Procedure Points
(R14893)
Reactor
(R14894)
(R14895)
Discharge pipe thermistor
(R12279)
Clip

Si001170 Removal of Electrical Box / PCB
Removal Procedure 15
2Cut the clamp. When reassembling, fix the
outdoor heat exchanger
lead wire and the harness of
the electronic expansion
valve with a clamp.
3Pull out the outdoor
heat exchanger
thermistor.
4Remove the thermistor
ASSY.
Step Procedure Points
(R14896)
Outdoor heat exchanger thermistor (R14897)
(R14898)

Removal of Sound Blankets Si001170
16 Removal Procedure
4. Removal of Sound Blankets
Procedure 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.
1Remove the 2 screws.
2Remove the partition
plate.
(R14899)
(R14900)
Partition plate

Si001170 Removal of Sound Blankets
Removal Procedure 17
2. Remove the sound
blankets.
Since the piping ports on the
sound blanket are torn
easily, remove the blanket
carefully.
1Lift and remove the
sound blanket (top).
2Pull the sound blankets
(outer) out.
3Pull the sound blanket
(inner) out.
Step Procedure Points
(R14901)
Sound blanket (top)
(R14902)
Sound blanket
(outer)
(R14903)
Sound blanket
(inner)

Removal of Electronic Expansion Valve Si001170
18 Removal Procedure
5. Removal of Electronic Expansion Valve
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
1Pull out the electronic
expansion valve coil.
2Remove the putty.
Warning
Be careful not to get yourself
burnt with the pipes and other
parts that are heated by the
gas brazing machine.
Warning
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. Avoid excessive heating.
(Keep below 120°C)
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.
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.
3Heat up the 2 brazed
parts. Remove the
electronic expansion
valve.
Electronic
expansion valve
(R15009)
(R15010)
Brazed part
Electronic
expansion valve
(R15011)