Dakin RXM85PVMA User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
8.5/9.5 kW Class
Si001423E

Service Manual
Removal Procedure
Outdoor Unit
zHeat Pump
RXM85PVMA
RXM95PVMA

Si001423E
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Fan Motor................................................................................................7
3. Electrical Box ..........................................................................................8
4. PCBs .....................................................................................................10
5. Coils / Thermistor ASSY .......................................................................14
6. Sound Blankets .....................................................................................17
7. Compressor...........................................................................................18
Note: The illustrations may be slightly different depending on the model.

Outer Panels Si001423E
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. Remove the suction grille.
1
2
Pull out the bottom of
the suction grille.
Unfasten the 3 hooks
on the top of the suction
grille and remove it.
Suction grille has other 6
hooks. When reassembling,
insert the 6 hooks into the
clearances of the outdoor
heat exchanger fins.
2. Remove the outer panels.
1Remove the 9 screws
and remove the top
panel.
Hook
Suction grille
(R21742)
Hook
Hook
(R21743)
Top panel
(R21744)

Si001423E Outer Panels
Removal Procedure 3
2
3
Remove the 5 screws.
Slide the right side
panel downward to
unfasten the 2 hooks on
the back.
4Remove the right side
panel.
5Remove the screw.
6Slide the front panel (2)
downward.
7Remove the front panel
(2).
The front panel has 3 hooks
on the back. When
reassembling, be sure to fit
all 3 hooks.
Step Procedure Points
Right side
panel
(R21745)
(R21746)
(R21747)
Front panel (2)
(R21748)

Outer Panels Si001423E
4Removal Procedure
8
9
Remove the 4 screws.
Pull out the bottom of
the discharge grille and
remove it.
The discharge grille has 4
hooks on the back. When
reassembling, make sure to
fit the 4 hooks.
10 Remove the nut and
remove the outdoor fan.
Nut size: M8
The 85 class model does not
have the  marked screw.
11 Remove the 8 screws
of the front panel (1).
Step Procedure Points
Discharge
grille
(R21749)
(R21750)
(R21751)
Nut
Outdoor fan
13 mm
(0.51 inch)
(R18965)
Front panel (1)
(R21752)
+
(R21753)
(Rear view)

Si001423E Outer Panels
Removal Procedure 5
12
13
Lift up the front panel
(1) to unfasten the
hook.
Remove the front panel
(1).
14 Remove the 2 screws
on the partition plate
(2).
Partition plate (2) has a hook
on the right.
15 Lift up the partition plate
(2) and remove it.
16 Remove the 3 screws
and remove the wire
fixture.
17 Remove the screws of
the terminal boards and
detach the demand
communication wire,
connecting wire and the
power supply wire.
Step Procedure Points
(R21754)
(R21755)
Partition
plate (2)
(R21756)
Hook
(R21757)
Wire fixture
Demand
communication
wire Connecting wire Power
supply wire
(R21758)

Outer Panels Si001423E
6Removal Procedure
18
19
Remove the 4 screws
of the rear panel.
Lift the rear panel
upward to unfasten the
2 hooks.
The 85 class model has 2
more screws on the back.
20 Remove the rear panel.
21 Push the hooks of the
outdoor temperature
thermistor holder from
the inner side of the
rear panel. Detach the
outdoor temperature
thermistor holder.
Step Procedure Points
Rear panel
(R21759)
(R21760)
Hook
(R21761)
Outdoor temperature
thermistor holder

Si001423E Fan Motor
Removal Procedure 7
2. Fan Motor
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1Disconnect the
connector [S70] and
pull out the clamp.
[S70]: fan motor
When reassembling, insert
the clamp into the hole.
2Release the fan motor
lead wire from the
groove and the 4
hooks.
3Cut the 2 clamps.
4Remove the 2 lower
screws.
Be sure to remove the lower
screws (1) first. If the top
screws (2) are removed first,
the fan motor may tilt down
or fall and cause injury
because its center of gravity
is shifted to the front.
5Remove the 2 upper
screws.
6Remove the fan motor. When reassembling, make
sure that the wire harness is
at the bottom.
[S70]
Clamp
(R21762)
(R21815)
Hook
Groove
Clamp
(R21763)
Fan motor
lead wire
(2)
(1)
(R6442)
Fan motor
(R6443)
Harness
(R6444)

Electrical Box Si001423E
8Removal Procedure
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 2 screws
and release the earth /
ground wires.
2Pull out the 2 clamps
and disconnect the
connector [S20].
[S20]: electronic expansion
valve coil
3Pull out the clamp and
disconnect the
connector [S80].
[S80]: four way valve coil
[S90]: thermistors
When reassembling, insert
each clamp into the small
holes.
4Pull out the clamp and
disconnect the
connector [S90].
5Release the thermistor
harness from the hook
on the bottom of the
electrical box.
6Pull out the clamp and
release the harness of
the thermistors.
(R21764)
Earth / ground wire
[S20]
Clamp
(R21765)
Clamp
[S90] [S80]
(R21766)
(R21816)
For the electronic
expansion valve
coil harness
For the four
way valve
coil harness
For the thermistor
harness
Clamp
Hook
(R21817)
(R21767)
Hook Clamp
Thermistor harness

Si001423E Electrical Box
Removal Procedure 9
7Pull out the clamp and
disconnect the relay
connector for
compressor.
8Disconnect the relay
connector for overload
protector.
9Remove the 2 screws.
10 Slide the electrical box
to the left to unfasten
the hook.
11 Lift up and remove the
electrical box.
Step Procedure Points
Clamp
Relay
connector for
compressor Relay connector for
overload protector
(R21768)
(R21769)
Electrical
box
Hook
(R21770)

PCBs Si001423E
10 Removal Procedure
4. PCBs
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 main PCB.
1Unfasten the 4 hooks
and remove the
electrical box cover.
2Disconnect the
connectors [S2], [S52],
[S102].
[S2]: demand control PCB
[S52] [S102]: main PCB
3Unfasten the 2 hooks
and remove the service
monitor PCB.
Hook
Electrical
box cover
Hook
(R21771)
[S102] [S2]
[S52]
(R21772)
Hook
Hook
Service monitor PCB
(R21773)

Si001423E PCBs
Removal Procedure 11
4Remove the screw of
the terminal board
cover.
5Remove the earth /
ground screw.
6Remove the screw and
remove the terminal
board for the smart
meter.
7Unfasten the hook on
the right and open the
terminal board cover.
When reassembling, make
sure to fit the 2 projections to
the holes at the bottom of the
terminal board cover.
8Disconnect all the
connectors.
When reassembling,
connect the connectors as
below.
Step Procedure Points
Terminal board cover
Earth /
ground wire
Terminal board
for smart meter (R21774)
Projection
Hook
(R21775)
(R21776)
2 (white)
1 (black)
L2
(brown)
N2
(blue)
LA
(black) L1 (black)
LA
(white) N1 (white)
3 (red)
(R21818)
(R21777)

PCBs Si001423E
12 Removal Procedure
9Disconnect the
connectors [HR1],
[HR2].
[HR1]: reactor (white)
[HR2]: reactor (blue)
The harness for [HR2] has a
ferrite core.
10 Remove the 3 screws
and unfasten the 4
hooks.
11 Lift up and remove the
main PCB.
2. Remove the reactor.
1Remove the 3 screws
of the reactor and 1
screw of the ferrite core
fixing band.
2Lift up and remove the
reactor.
Step Procedure Points
[HR1]
[HR2]
Ferrite core
(R21778)
Hook
Hook
Main PCB (R21779)
(R21780)
Reactor
Ferrite core
(R21781)

Si001423E PCBs
Removal Procedure 13
3. Remove the demand
control PCB.
1Remove the 2 screws.
2Lift up and remove the
demand control unit.
3Unfasten the 2 hooks
and open the cover.
4Disconnect the
connector [S206].
[S206]: terminal board for smart
meter
5Remove the screw and
remove the demand
control PCB.
Step Procedure Points
(R21782)
Demand
control unit
(R21783)
Cover
[S206] (R21784)
Demand control PCB
(R21785)

Coils / Thermistor ASSY Si001423E
14 Removal Procedure
5. Coils / Thermistor ASSY
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 electronic
expansion valve coil.
1Pull out the clamp from
the hook and release
the harness for
electronic expansion
valve coil.
2Pull out the electronic
expansion valve coil.
2. Remove the thermistor
ASSY.
The 85 class model does not
have a clamp at the top.
1Cut the 2 clamps.
2Pull out the outdoor
heat exchanger
thermistor.
Clamp
Electronic
expansion
valve coil
(R21786)
(R21787)
(R21788)
Outdoor heat
exchanger thermistor
Outdoor heat
exchanger
thermistor
(R21824)
Clip

Si001423E Coils / Thermistor ASSY
Removal Procedure 15
3Open the outdoor
temperature thermistor
holder.
When reassembling, pass
the outdoor temperature
thermistor through the heat
exchanger tube U-bend and
the hole as below.
4Release the outdoor
temperature thermistor.
5Pull out the clamp and
release the harness of
the discharge pipe
thermistor.
Step Procedure Points
Outdoor
temperature
thermistor
holder
(R21789)
U-bend
Hole
(R21820)
Outdoor temperature thermistor
(R9637)
Clamp
(R21790)
Discharge pipe
thermistor harness

Coils / Thermistor ASSY Si001423E
16 Removal Procedure
6Slightly open the sound
blanket (outer) and
sound blanket (top).
7Detach the discharge
pipe thermistor.
8Pull out the thermistor
ASSY.
3. Remove the four way
valve coil.
1Remove the screw and
remove the four way
valve coil.
Step Procedure Points
Sound blanket
(top)
Sound blanket
(outer) (R21791)
(R9635)
Discharge pipe thermistor
(R21792)
(R18076)
Four way valve coil

Si001423E 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).
2Pull out and remove the
sound blanket (outer).
3Pull out and remove the
sound blanket (inner).
Sound
blanket
(top)
(R21793)
Sound blanket
(outer)
(R21794)
Sound blanket
(inner) (R21795)

Compressor Si001423E
18 Removal Procedure
7. 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.
Restore the piping by non-oxidation brazing.
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.
Terminal
cover
(R21796)