Daikin RX25FV2C User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
2.5/3.2 kW Class
Si00-778

Service Manual
Removal Procedure
Outdoor Unit
zHeat Pump
RX25FV2C
RX32FV2C

Si00-778
Removal Procedure 1
Table of Contents
1. Removal of Panels ..................................................................................2
2. Removal of Fan Motor / Propeller Fan ....................................................4
3. Removal of PCB......................................................................................5
4. Removal of Sound Blanket....................................................................12
5. Removal of Four Way Valve .................................................................14
6. Removal of Compressor .......................................................................17
Note: The illustrations may be slightly different depending on the model.

Removal of Panels Si00-778
2Removal Procedure
1. Removal of Panels
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
1. Features
Take care not to cut your
finger by the fins of the heat
exchanger.
The stop valve cover is
united with the shelter.
When reassembling, make
sure to fit the 3 hooks.
1Loosen the screw of the
stop valve cover.
Pull down the stop
valve cover and remove
it.
INVERTER
(R7370)
(R7371)
INVERTER
(R7372)
INVERTER
(R7373)
Shelter
Hooks

Si00-778 Removal of Panels
Removal Procedure 3
2. Remove the panels.
1Loosen the 3 screws
(right: 2 screws, left: 1
screw) and lift the top
panel from the rear side
at first.
2Loosen the 5 screws of
the front panel.
3Lift up the left side and
undo the hook.
4Undo the right side
hook and remove the
front panel.
5Undo the 6 hooks and
remove the discharge
grille.
6The discharge grille has
2 projections to prevent
its rotation. Press the
projection from the rear
side and remove it
clockwise.
Step Procedure Points
INVERTER
Top panel
(R7374)
INVERTER
(R7375)
Handle
INVERTER
Front panel (R7376)
INVERTER
(R7425)
Discharge grille
Projection (rear side)

Removal of Fan Motor / Propeller Fan Si00-778
4Removal Procedure
2. Removal of Fan Motor / Propeller Fan
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
Remove the panels.
1. Remove the propeller fan.
1Disconnect the fan
motor connector (S70).
2Loosen the fixing hooks
and release the lead
wire.
Align the mark of the
propeller fan with the D-cut
section of the motor shaft
when reassembling.
3Unscrew the washer-
fitted nut (M10) of the
propeller fan with a
spanner.
4Remove the propeller
fan.
2. Remove the fan motor. Put the lead wire through the
back of the motor when
reassembling. (so as not to
be entangled with the
propeller fan)
1Loosen the screw to
remove the fan motor
fixing frame.
2Loosen the fixing hooks
and release the lead
wire.
3Loosen the 3 screws to
remove the fan motor.
(R7377)
[S70]
Shaft
D-cut
Mark
Washer-fitted nut 10mm
(R7378)
(R7379)
(R7380)
z
Mark indicates the location
of the lead wire.
Fan motor
fixing frame
(R3249)
Lead wire Propeller fan
(R7381)

Si00-778 Removal of PCB
Removal Procedure 5
3. Removal of PCB
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
Remove the panels. The outdoor air thermistor is
hooked on the guard net.
1. Remove the right side
panel.
1Loosen the screw on
the rear side.
2Unhook the outdoor air
thermistor.
3Lift up the guard net to
remove.
4Loosen the 4 screws on
the right side.
(R7382)
Outdoor air
thermistor
Right
side
panel
(R7383)
(R7384)
(R7385)

Removal of PCB Si00-778
6Removal Procedure
5Undo the rear side
hook.
When reassembling, make
sure to fit the hook.
6Lift up the right side
panel to remove.
2. Remove the electrical
box.
1Disconnect the
connector for four way
valve coil (S80).
2Disconnect the
connector for overload
protector.
Step Procedure Points
(R7386)
Outdoor air thermistor
Hook (R7387)
(R7388)
[S80]
[S40]
(R7389)

Si00-778 Removal of PCB
Removal Procedure 7
3Disconnect the
connector for electronic
expansion valve coil.
4Detach the clamp.
5Disconnect the
connector for
compressor motor.
Pay attention so as not to
lose the clip for thermistor.
When reassembling, do not
cover the dent of clip by
inserting the thermistor.
6Release the discharge
pipe thermistor.
Step Procedure Points
[S20] (R7390)
Clamp
(R7391)
(R7392)
Dent
Discharge pipe thermistor (R7393)

Removal of PCB Si00-778
8Removal Procedure
7Release the heat
exchanger thermistor.
Pay attention so as not to
lose the clip.
8Cut the clamp.
9Undo the hook from the
partition plate.
The electrical box can be
removed by lifting itself
without a screw driver.
10 Lift and remove the
electrical box.
Step Procedure Points
Heat exchanger thermistor
(R7394)
Clip
(R7395)
Clamp
(R7318)
(R7396)

Si00-778 Removal of PCB
Removal Procedure 9
3. Remove the PCB. The lead-free solder (PbF) is
used on PCB. When exchange,
use exclusive solder and
soldering gun.
1Loosen the screw on
the terminal board.
2Cut the clamp.
3Loosen the 2 screws of
the earth terminal.
4Disconnect the 2
connectors of the
reactor.
Step Procedure Points
(R7397)
Terminal board
(R7398)
(R7399)
Reactor
Brown White (R7400)

Removal of PCB Si00-778
10 Removal Procedure
5Loosen the 2 screws to
remove the reactor.
6Disconnect the
connector for thermistor
(S90).
7Loosen the 6 screws.
8Disconnect the 3
connectors for filter
PCB (S10, HN3, HL3).
Step Procedure Points
Reactor
(R7401)
[S90]
(R7402)
PCB (R7403)
[S10]
[HN3]
[HL3] (R7404)

Si00-778 Removal of PCB
Removal Procedure 11
9Undo the 2 hooks.
10 Lift and Remove the
PCB.
11 Feature of the PCB.
[S70]: fan motor
[S80]: four way valve
[S90]: thermistor
Step Procedure Points
(R7405)
(R7406)
[S70] [S90]
[S80]

Removal of Sound Blanket Si00-778
12 Removal Procedure
4. Removal of Sound Blanket
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
1. Remove the partition
plate.
1Loosen the 2 screws.
2The partition plate has
a hook on the lower
side. Lift and pull the
partition plate to
remove.
When reassembling, fit the
lower hook into the bottom
frame.
2. Remove the sound
blanket.
Since the piping ports on the
sound blanket are torn
easily, remove the blanket
carefully.
1Lift and remove the
sound blanket (top).
(R7407)
(R7408)
Hook
Partition
plate
Sound blanket (top)
(R7409)

Si00-778 Removal of Sound Blanket
Removal Procedure 13
2Lift and remove the
sound blanket (body) as
it is opened.
3Pull the sound blanket
(inner) out.
Since the piping ports on the
sound blanket are torn
easily, remove the blanket
carefully.
Step Procedure Points
(R7410)
Sound blanket (inner)
(R7411)

Removal of Four Way Valve Si00-778
14 Removal Procedure
5. Removal of Four Way Valve
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
1. Remove the peripheries.
Remove the four
way valve and the
sheets of putty so as
not to burn them.
1Loosen the screw of the
four way valve coil.
2Remove the terminal
cover.
3Disconnect the
terminal.
Be careful so as not to burn
the compressor terminals or
the name plate.
Make a note.
U: Red
V: Yellow
W: Blue
4Remove the electronic
expansion valve coil.
Four way valve coil (R7412)
Terminal cover
(R7413)
U
V
W
(R7414)
U(red)
V(yellow)
W(blue)
(R7415)

Si00-778 Removal of Four Way Valve
Removal Procedure 15
5Remove the putty.
6Cut the pipe with a tube
cutter. Caution
Be careful not to get yourself
burnt with the pipes and other
parts that are heated by the
gas welding rod.
Caution
From the viewpoint of global
environment protection, do
not discharge the refrigerant
gas in the atmosphere. Make
sure to recover the refrigerant
gas with the recovery system.
Before working,
make sure that the
refrigerant is empty
in the circuit.
Be sure to apply
nitrogen
replacement when
heating up the
brazed part.
2. Remove the four way
valve.
Reassembling precautions
1. Use non-oxidizing brazing
method. If nitrogen gas is not
available, braze the parts
speedily.
2. Avoid deterioration of the
gaskets due to carbonization
of oil inside the four way
valve or thermal influence.
For this purpose, wrap the
four way valve with wet
cloth. Splash water over the
cloth against becoming too
hot (keep it below 120°C).
1Heat up the brazed part
(a) and withdraw the
piping with pliers.
Step Procedure Points
Putty
(R7416)
Tube cutter Four way valve coil
(R7417)
(R7418)
(a)

Removal of Four Way Valve Si00-778
16 Removal Procedure
2Heat the 3 brazed
points of the four way
valve. Disconnect the
point (b) first.
In pulling the pipes, be
careful not to over-tighten
them with pliers. The pipes
may get deformed.
If the gas welding machine fails
to remove the four way valve,
take the steps below.
1. Disconnect the brazed pipe
sections that are readily
easy to separate and join
together later.
2. With a small copper tube
cutter, cut off the internal
pipes to easily take out the
four way valve.
Note:
Never use a hack saw. The
sawdust may come into the
circuit.
3Disconnect the points
(c) and (d).
Warning
If refrigerant gas leaks
during the job,
ventilate the room.
(Bear in mind that if
the refrigerant gas is
exposed to open
flames, noxious gas
may be generated.)
Step Procedure Points
(R7419)
(R7420)
(d)
(c)
(b)

Si00-778 Removal of Compressor
Removal Procedure 17
6. Removal of Compressor
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
1. Remove the peripheries.
Warning
Ventilate when refrigerant
leaks during the work.
(If refrigerant contacts fire, it
will cause to arise toxic gas.)
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 or
the name plate.
Be careful so as not to burn
the heat exchanger fin.
Warning
Since it may happen that
refrigeration oil in the
compressor will catch fire,
prepare wet cloth so as to
extinguish fire immediately.
In case of the difficulty with
gas brazing machine
1. Disconnect the brazed part
where is easy to disconnect
and restore.
2. Cut pipes on the main unit by
a miniature copper tube
cutter in order to make it
easy to disconnect.
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. For the
sake of this, wrap the four
way valve with wet cloth and
provide water so that the
cloth will not be dried and
avoid excessive heating.
(Keep below 120°C)
Note: Do not use a metal
saw for cutting pipes by all
means because the sawdust
come into the circuit.
Remove the four
way valve, the
terminal cover and
the lead wire for
compressor so as
not to burr them.
1Unscrew the nut of the
compressor.
2. Remove the compressor.
Before working,
make sure that the
refrigerant is empty
in the circuit.
Be sure to apply
nitrogen
replacement when
heating up the
brazed part.
1Heat up the brazed part
of the discharge side
and disconnect.
2Heat up the brazed part
of the suction side and
disconnect.
3Lift the compressor up
and remove it.
Caution
From the viewpoint of
global environment
protection, do not
discharge the
refrigerant gas in the
atmosphere. Make
sure to recover the
refrigerant gas with
the recovery system.
Caution
From the viewpoint of
global environment
protection, make sure
to use the vacuum
pump for air purge.
(R7421)
(R7422)
Discharge side
Suction side
(R7423)
(R7424)

Revision History
Month / Year Version Revised contents
07 / 2013 Si00-778 First edition