Daikin RXZ09NV1S User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
2.5/3.5/5.0 kW Class
9000/12000/18000 Btu/h Class
Si001412E

Service Manual
Removal Procedure
Outdoor Unit
zHeat Pump
RXZ09NV1S
RXZ12NV1S
RXZ18NV1S
RXZ25NVM
RXZ35NVM
RXZ50NVM
RXZ25NVM4
RXZ35NVM4
RXZ50NVM4
RXZ25NVMG
RXZ35NVMG
RXZ50NVMG
RXZ25NVMV
RXZ35NVMV
RXZ50NVMV

Si001412E
Removal Procedure 1
Table of Contents
1. Outer Panels / Outdoor Fan / Fan Motor.................................................2
2. Electrical Box ..........................................................................................7
3. PCB.......................................................................................................10
4. Reactor / Thermistor ASSY / Partition Plate .........................................12
5. Sound Blankets .....................................................................................15
6. Four Way Valve / Electronic Expansion Valve ......................................16
7. Compressor...........................................................................................19
Note: The illustrations may be slightly different depending on the model.

Outer Panels / Outdoor Fan / Fan Motor Si001412E
2Removal Procedure
1. Outer Panels / 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 2 screws
and remove the top
panel.
2 Remove the 6 screws.
3 Unfasten the 5 hooks
and remove the front
panel.
(R21563)
Top panel
Front panel (R21564)
(R21565)

Si001412E Outer Panels / Outdoor Fan / Fan Motor
Removal Procedure 3
4 Remove the 4 screws.
5 Unfasten the 6 hooks
and remove the
discharge grille.
6 Disconnect the
connector [S70].
[S70]: fan motor
7 Release the fan motor
lead wire from the 5
hooks.
Step Procedure Points
(R21566)
Discharge grille
(R21567)
[S70]
(R21568)
Hook
Hook
(R21569)

Outer Panels / Outdoor Fan / Fan Motor Si001412E
4Removal Procedure
8 Remove the nut and
remove the outdoor fan.
Nut size: M6
When reassembling, align
the mark of the outdoor
fan with the D-cut section of
the motor shaft.
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 Unfasten the 2 hooks
and release the fan
motor lead wire.
10 Remove the 4 screws
and remove the fan
motor.
Be sure to remove the lower
screws first. If the upper
screws are removed first,
the fan motor may tilt or fall
because the center of its
gravity is toward the front. It
may cause injuries.
Step Procedure Points
Nut Outdoor fan (R21570)
10 mm
(0.39 inch)
(R18954)
(R3249)
Lead wire Outdoor fan
Hook
(R21571)
Fan motor
(R21572)

Si001412E Outer Panels / Outdoor Fan / Fan Motor
Removal Procedure 5
11
12
Remove the screw of
the stop valve cover.
Slide the stop valve
cover down and remove
it.
When reassembling, make
sure to fit the 4 hooks.
13
14
Remove the 7 screws
and disconnect the
connecting wire and
power supply wire.
Remove the 3 screws
and remove the wire
fixture.
Step Procedure Points
Stop valve cover
(R21573)
Hook
(R21574)
Wire fixture
Connecting wire Power supply wire (R21575)

Outer Panels / Outdoor Fan / Fan Motor Si001412E
6Removal Procedure
15
16
Remove the 3 screws.
Slide the suction grille
to the right.
17 Unfasten the 5 hooks
and remove the suction
grille.
18
19
20
Detach the outdoor
temperature thermistor.
Remove the 3 screws
on the right side panel.
Remove the earth /
ground screw.
21
22
Unfasten the 4 hooks
and remove the right
side panel.
Remove the liquid
piping and the gas
piping.
When reassembling, make
sure to fit the 4 hooks.
Step Procedure Points
Suction
grille
(R21576)
(R21577)
Outdoor temperature thermistor
(R19605)
Earth / ground screw
(R20299)
Hook
Connecting wire
Liquid piping
Gas piping
(R19606)
Hook
Right side
panel Hook
(R20300)

Si001412E Electrical Box
Removal Procedure 7
2. 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
2
Remove the screw on
the electrical box cover.
Unfasten the 2 hooks of
the electrical box cover.
3 Lift up the electrical box
cover and remove it.
You can check the LED A
(green) through slit.
4
5
Disconnect the
connector [S70].
Release the fan motor
harness from the 5
hooks.
[S70]: fan motor
Electrical
box cover
(R21580)
Slit
(R21581)
Hook
Hook
[S70]
(R21582)

Electrical Box Si001412E
8Removal Procedure
6 Disconnect the
connectors [S20],
[S80], [S91].
[S20]: electronic expansion
valve coil
[S80]: four way valve coil
[S91]: liquid pipe thermistor
7
8
Disconnect the relay
connector for the
compressor.
Disconnect the relay
connector for the
overload protector.
9 Disconnect the
connector [S90].
[S90]: thermistor ASSY
10 Detach the clamp at the
bottom of the terminal
board.
Step Procedure Points
[S91] [S80] [S20]
(R21583)
Relay
connector
for overload
protector
Relay connector for compressor
(R21584)
[S90]
(R21585)
Clamp
(R21586)

Si001412E Electrical Box
Removal Procedure 9
11 Disconnect the 4
terminals from the
reactor.
When reassembling, match
the color of the sleeve with
the label on the reactor.
right: yellow
left: red
You can connect 2
harnesses of the same color
into either upper or lower.
12 Remove the screw in
front of the electrical
box.
13 Lift up the electrical box
and remove it.
Step Procedure Points
Reactor
(R21587)
Label
(R20301)
Electrical box
(R21589)
(R21590)

PCB Si001412E
10 Removal Procedure
3. PCB
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1
2
3
Remove the screw and
remove the terminal
board.
Remove the screw and
detach the earth /
ground wire.
Release the harnesses
from the hook.
4
5
Detach the 2 clamps.
Cut the clamp.
6 Remove the 9 screws.
Terminal board
Earth /
ground
wire
Hook
(R21591)
Clamp
Clamp for
compressor harness
Clamp for reactor harness
(R21592)
(R21593)

Si001412E PCB
Removal Procedure 11
7 Lift up the PCB and
remove it.
In working, be careful not to
break the PCB with the
excessive force because
the PCB and the radiation
fin are adhered to one
another.
8 Names of the parts on
the PCB
[S20]: electronic expansion
valve coil
[S40]: overload protector
[S70]: fan motor
[S80]: four way valve coil
[S90]: thermistor ASSY
[S91]: liquid pipe thermistor
Step Procedure Points
PCB
(R21594)
[S20] [S80]
[S40] [S70]
[S91]
[S90]
(R21595)

Reactor / Thermistor ASSY / Partition Plate Si001412E
12 Removal Procedure
4. Reactor / 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 reactor.
1 Remove the screw and
remove the reactor.
2. Release the outdoor heat
exchanger thermistor.
1 Remove the tape from
the outdoor heat
exchanger thermistor
harness.
2 Release the outdoor
heat exchanger
thermistor.
Be careful not to lose the
clip for the thermistor.
Reactor
(R21596)
Outdoor heat
exchanger
thermistor
harness
Tape
(R21597)
(R19625)
Outdoor heat
exchanger
thermistor
(R3264)
Clip

Si001412E Reactor / Thermistor ASSY / Partition Plate
Removal Procedure 13
3. Release the discharge
pipe thermistor.
Since the piping ports on
the sound blanket are torn
easily, remove the sound
blanket carefully.
1
2
Open the sound blanket
(top).
Open the front of the
sound blanket (outer).
3 Detach the discharge
pipe thermistor.
Be careful not to lose the
fixture for the discharge pipe
thermistor.
When reassembling, meet
the edge of the thermistor
and the fixture.
4. Release the liquid pipe
thermistor.
Be careful not to lose the
clip for the thermistor.
1
2
Open the right side of
the sound blanket
(outer).
Detach the liquid pipe
thermistor.
Step Procedure Points
(R19626)
Sound blanket (top)
Sound blanket
(outer)
Discharge
pipe
thermistor
(R21598)
Fixture
(R21588)
(R19628)
Liquid pipe thermistor
(R3264)
Clip

Reactor / Thermistor ASSY / Partition Plate Si001412E
14 Removal Procedure
5. Remove the partition plate.
1 Remove the 2 screws
and remove the
partition plate.
2 The partition plate is
fixed by a hook on the
bottom frame.
Step Procedure Points
Partition plate
(R21599)
Hook
(R21600)

Si001412E Sound Blankets
Removal Procedure 15
5. 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 sound
blanket (top).
Since the piping ports on
the sound blanket are torn
easily, remove the blanket
carefully.
2 Remove the sound
blanket (outer).
3
4
Open the sound blanket
(inner) and pull it out.
Pull out the sound
blanket (bottom).
(R19631)
Sound blanket (top)
(R19633)
Sound blanket (outer)
(R19634)
Sound blanket
(inner)
Sound blanket
(bottom)

Four Way Valve / Electronic Expansion Valve Si001412E
16 Removal Procedure
6. Four Way Valve / 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.)
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
2
Remove the screw and
remove the four way
valve coil.
Pull out the electronic
expansion valve coil.
(R19635)
Four way
valve coil
Electronic expansion
valve coil

Si001412E Four Way Valve / Electronic Expansion Valve
Removal Procedure 17
3 Remove the sheets of
putty and shield plate.
Be careful so as not to burn
the compressor terminals or
the name plate.
4
5
Remove the terminal
cover and the
protection bushing.
Disconnect the
compressor lead wires
and detach the
overload protector.
6
7
Heat up the 4 brazed
parts of the four way
valve in the order of (a)
(b) (c) (d).
Remove the four way
valve.
Step Procedure Points
Shield plate
(R19636)
Terminal cover
Protection
bushing
V (yellow)
W (blue)
U (red)
Overload protector (R21601)
(R19638)
(a)
(b)
(c)
(d)
Four way valve

Four Way Valve / Electronic Expansion Valve Si001412E
18 Removal Procedure
8 Heat up the 2 brazed
parts of the electronic
expansion valve in the
order of (e) (f).
9 Remove the electronic
expansion valve.
Step Procedure Points
(R19639)
Electronic expansion valve
(e) (f)
(R19640)