Daikin ARXS42G3V1B User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
4.2 kW Class
Si001277

Service Manual
Removal Procedure
Outdoor Unit
zHeat Pump
ARXS42G3V1B
RXS42K2V1B

Si001277
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Electrical Box ..........................................................................................3
3. PCB.........................................................................................................6
4. Partition Plate / Sound Blankets..............................................................8
5. Outdoor Fan / Fan Motor.......................................................................10
6. Thermistors ...........................................................................................12
7. Four Way Valve / Electronic Expansion Valve......................................13
8. Compressor...........................................................................................16
Note: The illustrations may be slightly different depending on the model.

Outer Panels Si001277
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 2 screws
and remove the top
panel.
Remove the 8 screws
and remove the front
panel.
The front panel has 4 hooks.
3Remove the 4 screws
and remove the
discharge grille.
When reassembling, make
sure to fit the 4 hooks.
4Remove the screw and
remove the stop valve
cover.
The stop valve cover is
united with the shield plate.
When reassembling, make
sure to fit the 5 hooks.
(R18665)
Hook
Hook
(R9364)
(R8139)
Stop
valve
cover
(R12213)
Shield plate
Top panel
Discharge grille Front panel

Si001277 Electrical Box
Removal Procedure 3
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 3 screws
and remove the wire
fixture.
Remove all the screws
to disconnect the power
supply cables and the
connecting wires.
When reassembling, fasten
the wires with screws on the
terminal board.
3Release the outdoor
temperature thermistor.
4Lift up the protection
net and remove it.
5Remove the 7 screws
and remove the right
side panel.
(R18666)
Wire fixture
Power
supply
cable
Connecting
wire
Terminal
board
(R12193)
Outdoor temperature thermistor
(R18894)
Protection
net
(R12217)
Right side panel

Electrical Box Si001277
4Removal Procedure
6Disconnect the
connector [S70].
[S70]: fan motor
7Disconnect the
connector [S20] [S40]
[S80] [S90].
[S20]: electronic expansion
valve coil
[S40]: overload protector
[S80]: four way valve coil
[S90]: thermistors
8Disconnect the relay
connector for the
compressor.
9Disconnect the 2
connectors for the
reactor.
When reassembling, you
can connect the 2 harnesses
in either way regardless of
the color.
Step Procedure Points
(R0254)
[S70]
(R18668)
[S40] [S90] [S20] [S80]
(R0259)
(R0260)

Si001277 Electrical Box
Removal Procedure 5
10 Release the discharge
pipe thermistor.
Be careful not to lose the
fixture for the thermistor.
11 Detach the clamp for
the thermistors from the
electrical box.
12 Remove the screw in
front of the electrical
box.
13 Lift and remove the
electrical box.
Step Procedure Points
(R12197)
Discharge
pipe thermistor
(R18789)
Fixture
(R0262)
(R12196)
(R0263)
(R0264)

PCB Si001277
6Removal 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
Remove the screw and
remove the electrical
box cover.
Detach the insulation
sheet.
The trimmed part goes front.
3
4
5
Remove the 2 screws
of the earth terminals.
Release the earth wire
from the hook.
Remove the screw of
the terminal board.
6Remove the 2 screws
and detach the clip to
remove the radiation
shield plate.
Electrical box cover
Insulation
sheet
(R18895)
Terminal
board
Earth
terminal
(R18670)
Hook
(R12198)
Radiation shield plate
Clip

Si001277 PCB
Removal Procedure 7
7Cut the 5 clamps and
disconnect the wire
harnesses.
8
9
Remove the 8 screws
of the PCB.
Lift up the back side
slightly and unfasten
the 3 hooks of the front.
When reassembling, make
sure to fit the 3 hooks of the
electrical box.
10 Lift up and remove the
PCB.
11 Remove the screw and
remove the radiation
fin.
Step Procedure Points
(R8162)
(R18671)
PCB
Hook
(R8168)
(R12214)
Radiation fin

Partition Plate / Sound Blankets Si001277
8Removal Procedure
4. Partition Plate / 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 partition
plate.
When reassembling, fit the
lower hooks into the bottom
frame.
1Remove the 2 screws.
2
3
The partition plate has
hooks on the lower
side. Lift and remove
the partition plate.
Remove the screw to
remove the reactor.
2. Remove of the sound
blanket.
Since the piping ports are
torn easily, remove the
blanket carefully.
1Remove the sound
blanket (outer).
(R12282)
Partition plate
(R14110)
(R14111)
Reactor
(R12199)
Sound blanket (outer) (R8180)

Si001277 Partition Plate / Sound Blankets
Removal Procedure 9
2Remove the sound
blanket (top upper).
3Remove the sound
blanket (top lower).
4Remove the sound
blanket (inner).
Step Procedure Points
(R12200)
Sound blanket (top upper)
(R8178)
Sound blanket (top lower)
(R12201)
Sound blanket (inner)

Outdoor Fan / Fan Motor Si001277
10 Removal Procedure
5. 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 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.
2Disconnect the
connector [S70].
[S70]: fan motor
3Release the fan motor
lead wire from the
hooks.
(R18672)
D-cut
Nut Outdoor fan
10 mm
(0.39 inch)
(R18954)
(R8184)
[S70]
(R8185)

Si001277 Outdoor Fan / Fan Motor
Removal Procedure 11
4Remove the screw and
remove the fan motor
fixing frame.
When reassembling, fit the
lower hooks into the bottom
frame.
5Open 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.
6Remove the 4 screws
and 4 rubber vibration
isolators to remove the
fan motor.
Step Procedure Points
(R12202)
Fan motor
fixing frame
(R8187)
(R11835)
(R3249)
Lead wire Outdoor fan
(R8190)
(R18896)
Rubber
vibration
isolator

Thermistors Si001277
12 Removal Procedure
6. Thermistors
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1Release the discharge
pipe thermistor.
Be careful not to lose the
fixture for the thermistor.
2Cut the clamp and pull
out the outdoor heat
exchanger thermistor.
The thermistors for outdoor
temperature / discharge pipe /
outdoor heat exchanger are
united as one assembly.
(R8192)
Discharge pipe thermistor
(R18789)
Fixture
(R8193)
Outdoor heat
exchanger thermistor
(R8194)

Si001277 Four Way Valve / Electronic Expansion Valve
Removal Procedure 13
7. 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. Remove the peripheries.
Detach the four way valve
coil and the 2 clamps, and
then detach the wire
harnesses.
1Remove the screw and
remove the four way
valve coil.
(R7703)
(R18933)

Four Way Valve / Electronic Expansion Valve Si001277
14 Removal Procedure
2Pull out the electronic
expansion valve coil.
3Remove the putty.
4Remove the terminal
cover.
5
6
Disconnect the lead
wires of the
compressor.
Unfasten the hooks with
a flat screwdriver to
remove the overload
protector.
Step Procedure Points
(R8204)
(R8205)
(R8195)
Terminal cover
(R18897)
Overload
protector
Red (U)
Yellow (V)
Blue
(W)
U
WV

Si001277 Four Way Valve / Electronic Expansion Valve
Removal Procedure 15
2. Remove the four way
valve and electronic
expansion valve.
1Heat up the 2 brazed
parts of the electronic
expansion valve and
remove it.
2
3
Heat up the brazed
parts of the four way
valve.
Pull the pipe with pliers
and disconnect.
Step Procedure Points
(R8206)
(R8207)

Compressor Si001277
16 Removal Procedure
8. Compressor
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.)
Since it may happen that the refrigerant oil in the compressor catches fire, prepare wet
cloth so as to extinguish fire immediately.
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
1Remove the terminal
cover.
(R8195)
Terminal cover

Si001277 Compressor
Removal Procedure 17
2
3
Disconnect the lead
wires of the
compressor.
Unfasten the hooks with
a flat screwdriver to
remove the overload
protector.
4
5
Remove the protection
bushing.
Remove the 2 nuts of
the compressor.
6Heat up the brazed part
of the discharge side
and disconnect.
7Heat up the brazed part
of the suction side and
disconnect.
8Lift up the compressor
and remove it.
Step Procedure Points
(R18897)
Overload
protector
Red (U)
Yellow (V)
Blue
(W)
U
WV
(R18673)
Protection bushing
Nut
(R18898)
Discharge
side Suction side
(R8202)

Revision History
Month / Year Version Revised contents
04 / 2013 Si001277 First edition