Daikin RK20GV1B User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
2.0/2.5/3.0/3.5 kW Class
Si00-874

Service Manual
Removal Procedure
Outdoor Unit
zCooling Only zHeat Pump
RK20GV1B ARX20GV1B
RK25GV1B ARX25GV1B
RK35GV1B ARX35GV1B
RK20GVLT RX20GV1B
RK25GVLT RX25GV1B
RK30GVLT RX35GV1B
RX20GVLT
RX25GVLT
RX30GVLT

Si00-874
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 / PCBs ...........................................................6
4. Removal of Sound Blankets..................................................................14
5. Removal of Electronic Expansion Valve ASSY.....................................16
6. Removal of Four Way Valve .................................................................17
7. Removal of Compressor .......................................................................19
Note: The illustrations may be slightly different depending on the model.
The illustrations are for heat pump models as representative.

Removal of Outer Panels Si00-874
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.
The stop valve cover is
united with the shield plate.
When reassembling, make
sure to fit the 3 hooks.
1Remove the screw of
the stop valve cover.
Pull down the stop
valve cover and remove
it.
(R10742)
(R14768)
(R16329)
Stop valve
cover
(R16330)
Shield plate
Hook

Si00-874 Removal of Outer Panels
Removal Procedure 3
2Remove the 3 screws
(right: 1 screw, left: 2
screws) and remove the
top panel.
3Remove the 6 screws
of the front panel.
4Lift up the left side and
unfasten the hooks.
5Unfasten the right side
hooks and remove the
front panel.
6The discharge grille has
2 projections to prevent
its rotation. Press the
projection from the rear
side and rotate the
discharge grille to
remove it.
Step Procedure Points
Top panel
Front panel (R16331)
(R17304)
(R17306)
(R17307)
Projection (rear side)
Discharge grille

Removal of Outdoor Fan / Fan Motor Si00-874
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: M6
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].
2Release the fan motor
lead wire from the
hooks.
3Remove the screw and
remove the fan motor
fixing frame.
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.
(R17341)
Shaft
D-cut
Nut
Outdoor
fan
10 mm
(R12236)
(R17338)
Hook
Fan motor lead wire
[S70]
(R17284)
Fan motor fixing frame
(R3249)
Lead wire Outdoor fan

Si00-874 Removal of Outdoor Fan / Fan Motor
Removal Procedure 5
4Release the fan motor
lead wire from the
hooks.
5Remove the 3 screws
to remove the fan
motor.
Step Procedure Points
(R14778)
(R14779)
Fan motor

Removal of Electrical Box / PCBs Si00-874
6Removal Procedure
3. Removal of Electrical Box / PCBs
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”.
1Release the outdoor
temperature thermistor.
2Lift up the guard net to
remove.
3Remove the screws
and release the
connecting wire and the
power supply wire.
4Remove the 3 screws
and remove the wire
clamp.
(R7383)
(R7384)
(R17285)
Connecting wire Power supply
wire
(R14783)
Wire
clamp

Si00-874 Removal of Electrical Box / PCBs
Removal Procedure 7
5Remove the screw on
the rear side of the right
side panel.
6Remove the 4 screws
on the right side panel.
7Unfasten the hook on
the rear side.
When reassembling, make
sure to fit the hook.
8Unfasten the 2 hooks,
and remove the right
side panel.
Step Procedure Points
(R17308)
Right
side
panel
(R11762)
Hook
(R11763)
(R18221)
Right
side
panel
Hook
Hook

Removal of Electrical Box / PCBs Si00-874
8Removal Procedure
2. Remove the electrical box. [S80]: four way valve coil
1Disconnect the
connector [S80].
2Disconnect the
connector [S40].
[S40]: overload protector
3Disconnect the
connector [S20].
[S20]: electronic expansion
valve coil
4Disconnect the relay
connector for the
compressor.
Step Procedure Points
(R7388)
[S80]
[S40]
(R7389)
[S20] (R7390)
(R7392)

Si00-874 Removal of Electrical Box / PCBs
Removal Procedure 9
5Release the discharge
pipe thermistor.
Pay attention so as not to
lose the fixture for the
thermistor.
When reassembling, do not
insert the thermistor up to
the dent of fixture.
6Pull out the outdoor
heat exchanger
thermistor.
Pay attention so as not to
lose the clip for the
thermistor.
7Cut the clamp.
8Unfasten the hook from
the partition plate with a
flat screwdriver.
The electrical box can be
removed by lifting itself
without a screwdriver.
Step Procedure Points
Discharge pipe thermistor
(R18744)
Dent
Fixture
(R18746)
(R18745)
Outdoor heat
exchanger
thermistor
Clip
(R18747)
(R7395)
Clamp
(R7318)

Removal of Electrical Box / PCBs Si00-874
10 Removal Procedure
9Lift and remove the
electrical box.
3. Remove the main PCB. 1: black, upper
2: white, lower
3: red, upper
( ) : green / yellow, lower
1Remove the screw on
the terminal board.
2Cut the clamp.
3Remove the 2 screws
of the earth / ground
wires.
4Disconnect the 2
terminals of the reactor.
Step Procedure Points
(R11236)
Electrical box
(R18222)
Terminal board
Clamp
Main PCB
(R15867)
(R18751)
Reactor
BrownWhite

Si00-874 Removal of Electrical Box / PCBs
Removal Procedure 11
5Remove the 3 screws
to remove the reactor.
6Disconnect the
connector [S90].
[S90]: thermistors
7Remove the 6 screws.
8Disconnect the 3
connectors [S10] [HL3]
[HN3].
[S10] [HL3] [HN3]: filter PCB
Step Procedure Points
Reactor
(R15862)
[S90]
(R15863)
Main PCB (R15864)
[S10]
(R17309)
[HN3]:
blue [HL3]:
orange

Removal of Electrical Box / PCBs Si00-874
12 Removal Procedure
9Unfasten the 2 hooks.
10 Lift and remove the
main PCB.
4. Remove the filter PCB.
1Cut the clamp.
2Release the harnesses
from the hooks.
Step Procedure Points
(R15869)
(R14813)
(R14814)
(R18752)

Si00-874 Removal of Electrical Box / PCBs
Removal Procedure 13
3Remove the screw.
4Unfasten the 2 hooks.
5Release the harnesses.
6Remove the filter PCB.
Step Procedure Points
(R14816)
(R14817)
(R14818)
(R14819)
Filter PCB

Removal of Sound Blankets Si00-874
14 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.
Some models have 3
screws.
1Remove the 2 screws.
2The 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.
(R17286)
(R14821)
Partition
plate
Hook

Si00-874 Removal of Sound Blankets
Removal Procedure 15
2. Remove the sound
blankets.
Since the piping ports on the
sound blanket are torn
easily, remove the blanket
carefully.
The design of the sound
blankets varies depending
on the model.
1Lift and remove the
sound blanket (top).
2Pull the sound blankets
(outer and inner 2) out.
Some models have no
sound blanket (inner 2).
3Pull the sound blanket
(inner 1) out.
Step Procedure Points
Sound blanket (top)
(R17287)
Sound blanket
(outer)
Sound blanket
(inner 2)
(R14823)
Sound blanket (inner 1)
(R14824)

Removal of Electronic Expansion Valve ASSY Si00-874
16 Removal Procedure
5. Removal of Electronic Expansion Valve ASSY
Procedure 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 electronic
expansion valve coil.
2 Remove the 2 screws.
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
Never remove the electronic
expansion valve because it
contains plastic parts.
They may melt with heat and
cause operation failure.
Replace the whole assembly.
Caution
Do not directly heat the
electronic expansion valve.
Wrap the electronic
expansion valve with wet
cloth and provide water so
that the cloth does not dry.
(Keep below 120°C.)
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.
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.
3
4
Remove the putty and
heat up the brazed part.
Remove the electronic
expansion valve ASSY.
(R14830)
Electronic
expansion
valve coil
(R14831)
Screw
(R17339)
Electronic expansion
valve ASSY

Si00-874 Removal of Four Way Valve
Removal Procedure 17
6. Removal of Four Way Valve
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 peripheries.
1Remove the terminal
cover.
2Remove the screw and
remove the four way
valve coil.
3Disconnect the
terminals of the
compressor.
4Remove the overload
protector.
(R15005)
Terminal cover
(R12653)
The cooling only models do
not have a four way valve.
There are 2 hooks at the inner
side of the terminal cover.
(R11799)
Four way valve coil
(R14529)
U (red)
V (yellow) W (blue)
Overload
protector

Removal of Four Way Valve Si00-874
18 Removal Procedure
5Pull out the electronic
expansion valve coil.
6Remove 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. 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.) For the
sake of this, wrap the four
way valve with wet cloth and
provide water so that the
cloth does not dry.
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.
2. Remove the four way
valve.
1Heat up the brazed
point (a) and withdraw
the piping with pliers.
2Heat up the 3 brazed
points of the four way
valve. Disconnect the
point (b) first.
3Disconnect the points
(c) and (d).
Note:
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.
Step Procedure Points
(R11798)
Electronic
expansion
valve coil
(R11800)
(R11802)
(a)
(R11804)
(d)
(c)(b)