Daikin RX18N5VL User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
18000 Btu/h Class
Outdoor Unit
Inverter
Pair Type
Si001419E

Service Manual
Removal Procedure
Outdoor Unit
zHeat Pump
RX18N5VL

Si001419E
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 Coil / Four Way Valve...............................18
8. Compressor...........................................................................................21

Outer Panels Si001419E
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
1Remove the 6 screws
and remove the top
panel.
2Remove the 8 screws
of the front panel.
3Slide the fan motor
fixing plate to the left
and unfasten the 2
hooks.
Top panel
(R20902)
Front panel
(R20903)
Hook
Fan motor fixing plate
(R20904)

Si001419E Outer Panels
Removal Procedure 3
4
5
Unfasten the 2 hooks
on the right side.
Remove the front panel.
6Remove the 4 screws
of the discharge grille.
7Unfasten the 6 hooks
and remove the
discharge grille.
Step Procedure Points
Hook
Front panel
(R20905)
Discharge grille
(R20906)
Discharge grille
(R20907)

Outdoor Fan / Fan Motor Si001419E
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
1Remove the drip proof
cover.
2Remove 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
(R20908)
Terminal
cover
(R20909)
Hook
Terminal cover
(R20910)

Si001419E Outdoor Fan / Fan Motor
Removal Procedure 5
5Disconnect the
connector [S70].
[S70]: fan motor
6Unfasten the clamp of
the fan motor lead wire
(on the outer side of the
electrical box).
7Release the fan motor
lead wire from the
groove and unfasten
the 2 hooks.
Step Procedure Points
[S70]
(R20911)
Fan motor
lead wire
Clamp
(R20912)
Top view
Fan motor lead wireGrooveHook
(R20913)

Outdoor Fan / Fan Motor Si001419E
6Removal Procedure
8Remove the nut and
remove the outdoor fan.
Nut size : M8
9Remove the 2 screws
and remove the fan
motor fixing frame.
When reassembling, fit the
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
Nut Outdoor fan (R20914)
13 mm
(0.51 inch)
(R18965)
Fan motor fixing frame
(R20915)
Hook (R20916)
Hook
Fan motor lead wire
(R20917)
Fan motor (R20918)

Si001419E 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
1Remove the 3 screws
and remove the wire
fixture.
2Remove the 7 screws
on the terminal board
and disconnect the
connecting wire and
power supply wire.
3Remove the 2 screws.
Wire fixture
(R20919)
Connecting wire Power supply wire
Terminal board
(R20920)
(R20921)

Electrical Box Si001419E
8Removal Procedure
4Disconnect the
connector [S80] and
pull out the clamp (Hole
No.5).
[S80]: four way valve coil
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.10
(4) [S80]: Hole No.5
5Disconnect the
connector [S20] and
pull out the clamp (Hole
No.10).
Step Procedure Points
[S80]
Clamp
(R20922)
14
1516
13
Hole No. for wiring clamps
135 7 911
2 4 6 8 10 12
(R20993)
[S20]
Clamp
(R20923)
[S20]: electronic expansion
valve coil

Si001419E Electrical Box
Removal Procedure 9
6Disconnect the
connector [S40] and
pull out the 2 clamps
(Hole No.16 and 2).
7Disconnect the
connector [S90] and
pull out the 4 clamps
(Hole No.15, 13, 7, and
3).
8Pull out the clamp from
the Hole No.14 and
release the outdoor
temperature thermistor
harness from the
groove.
Step Procedure Points
Clamp
[S40]
Clamp
(R20924)
Clamp
Clamp
[S90]
[S90]
Clamp
(R20925)
Groove
Clamp
Outdoor
temperature
thermistor
harness
(R20926)
[S40]: overload protector
[S90]: thermistors

Electrical Box Si001419E
10 Removal Procedure
9Remove the outdoor
temperature thermistor.
10 Disconnect the relay
connector for
compressor.
11 Remove the screw and
remove the electrical
box.
Step Procedure Points
Outdoor temperature
thermistor
(R20927)
Relay connector (R20928)
Electrical box
(R20929)

Si001419E 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
1Pull out the 3 terminals
from the terminal board.
Before pulling out the
terminals, confirm the
terminal locations.
(1): black (front)
(2): white (front)
(3): red (front)
2Pull out the clamp (1)
and cut the clamp (2).
3Remove the earth /
ground screw.
(3)
(2)
(1)
(R20930)
Clamp (2) Clamp (1)
(R20931)
Earth / ground screw
(R20932)

PCB Si001419E
12 Removal Procedure
4Cut the clamp and
release the relay
harness from the
groove.
5Remove the 3 screws
of the mounting plate
for terminal board.
6Remove the 7 screws
of the PCB.
Step Procedure Points
Clamp
Groove
Relay
harness
(R20933)
Mounting plate for terminal board
(R20934)
PCB (R20935)

Si001419E PCB
Removal Procedure 13
7Unfasten the 6 hooks.
8Remove the PCB.
Step Procedure Points
Hook
Hook
(R20936)
PCB
(R20937)

Thermistor ASSY / Partition Plate Si001419E
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.
1Remove the screw of
the stop valve cover.
2Slide the stop valve
cover downward and
remove it.
When reassembling, make
sure to fit the 3 hooks.
3Remove the 4 screws
of the right side panel.
Stop valve cover
(R20938)
Stop valve cover
(R20939)
Hook
Hook
(R20940)
Right side panel
(R20941)

Si001419E Thermistor ASSY / Partition Plate
Removal Procedure 15
4Unfasten the 3 hooks
and remove the right
side panel.
2. Remove the thermistor
ASSY.
Be careful not to lose the clip
for the thermistor.
1Cut the clamp and pull
out the outdoor heat
exchanger thermistor.
2Open 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
Hook
(R20942)
Clamp
Outdoor heat
exchanger
thermistor
(R20943)
Clip
(R3264)
Discharge pipe
thermistor
Sound blanket
(top)
(R20944)
Fixture
(R20999)

Thermistor ASSY / Partition Plate Si001419E
16 Removal Procedure
3Remove the thermistor
ASSY.
3. Remove the partition
plate.
When reassembling, fit the
lower hook into the bottom
frame.
1Remove the 2 screws
and remove the
partition plate.
Step Procedure Points
Thermistor ASSY
(R20945)
Partition plate
(R20946)
Hook Bottom frame (R20947)

Si001419E 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
1Remove the sound
blanket (top).
2Open and pull up the
sound blanket (outer).
3Remove the sound
blanket (inner).
Sound blanket
(top)
(R20948)
Sound blanket
(outer)
(R20949)
Sound blanket (inner)
(R20950)

Electronic Expansion Valve Coil / Four Way Valve Si001419E
18 Removal Procedure
7. Electronic Expansion Valve Coil / 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.
Electronic
expansion
valve coil
(R20951)