Daikin RXN25KEV1B User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
2.5/3.5 kW Class
Outdoor Unit
Inverter
Pair Type
Si001161

Service Manual
Removal Procedure
Outdoor Unit
Applicable Models
zHeat Pump
RXN25KEV1B
RXN35KEV1B
RXN425KC
RXN435KC

Si001161
Removal Procedure 1
Table of Contents
1. Removal of Outer Panels ........................................................................2
2. Removal of Outdoor Fan / Fan Motor .....................................................4
3. Removal of Electrical Box / PCB.............................................................6
4. Removal of Sound Blankets..................................................................14
5. Removal of Four Way Valve .................................................................16
6. Removal of Compressor .......................................................................19
Note: The illustrations may be slightly different depending on the model.

Removal of Outer Panels Si001161
2Removal Procedure
1. Removal of Outer Panels
Procedure Warning Be sure to wait for 10 minutes or more after turning off all power
supplies before disassembling work.
Step Procedure Points
1. Appearance features
Take care not to cut your
finger by the fins of the
outdoor heat exchanger.
2. Remove the panels.
The stop valve cover is
united with the shield plate.
When reassembling, make
sure to fit the 3 hooks.
1Remove the screw of
the stop valve cover.
Pull down the stop
valve cover and remove
it.
(R10707)
(R15858)
(R10709)
Stop valve
cover
(R14606)
Shield plate
Hook

Si001161 Removal of Outer Panels
Removal Procedure 3
2Remove the 3 screws
(right: 1 screw, left: 2
screws) and remove the
top panel.
3Remove the 5 screws
of the front panel.
4Lift up the left side and
unfasten the hooks.
5Unfasten the right side
hooks and remove the
front panel.
6
7
Remove the 4 screws
of the discharge grille.
Unfasten the 6 hooks
and remove the
discharge grille.
Step Procedure Points
(R10711)
Top panel
Front panel
(R10712)
(R10713)
(R10714)
Discharge grille

Removal of Outdoor Fan / Fan Motor Si001161
4Removal Procedure
2. Removal of Outdoor Fan / Fan Motor
Procedure 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 outdoor fan. Preparation
Remove the panels
according to the “Removal
of Outer Panels”.
Nut size: M6
1
2
Remove the nut of the
outdoor fan.
Remove the outdoor
fan.
When reassembling, align
the mark of the outdoor
fan with the D-cut section of
the motor shaft.
2. Remove the fan motor. [S70]: fan motor
When reassembling, set the
fan motor lead wire into the
hook.
1
2
Disconnect the
connector for the fan
motor [S70].
Release the fan motor
lead wire from the hook.
3Release the fan motor
lead wire from the 3
hooks.
When reassembling set the
fan motor lead wire into the
3 hooks.
(R17480)
Shaft
D-cut
Nut
Mark
Outdoor fan
10 mm
(R12236)
[S70] Hook Fan motor
lead wire
(R14491)
(R14492)

Si001161 Removal of Outdoor Fan / Fan Motor
Removal Procedure 5
4Remove the screw and
remove the fan motor
fixing frame.
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.
5Release the fan motor
lead wire from the
hooks.
When reassembling, set the
clamped position under the
lower hook of the fan motor
fixing flame.
6Remove the 3 screws
and remove the fan
motor.
Step Procedure Points
Fan motor fixing frame
(R15874)
(R3249)
Lead wire Outdoor fan
(R14494)
Clamp
(R14495)
Fan motor

Removal of Electrical Box / PCB Si001161
6Removal Procedure
3. Removal of Electrical Box / PCB
Procedure 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 PCB. Preparation
Remove the panels
according to the “Removal
of Outer Panels”.
Some models have another
wiring for outdoor power-
receiving system.
1Remove the screws
and release the
connecting wire.
2Remove the 3 screws
and remove the wire
clamp.
3
4
Disconnect the
connector for the fan
motor [S70].
Release the fan motor
lead wire from the hook.
[S70]: fan motor
5Release the fan motor
lead wire from the 3
hooks.
(R17481)
Connecting wire
(R15875)
Wire
clamp
[S70] Hook Fan motor
lead wire
(R14491)
(R14492)

Si001161 Removal of Electrical Box / PCB
Removal Procedure 7
6Remove the screw on
the rear side of the right
side panel.
7Remove the 4 screws
on the right side panel.
8Unfasten the hook on
the rear side.
When reassembling, make
sure to fit the hook.
9Release the outdoor
temperature thermistor
from the outdoor heat
exchanger.
Step Procedure Points
(R15876)
Right
side
panel
(R14499)
(R14500)
Outdoor
temperature
thermistor (R16052)

Removal of Electrical Box / PCB Si001161
8Removal Procedure
10 Unfasten the hook, and
remove the right side
panel.
11 Pull out the terminals
from the terminal board
except the earth wire.
1 : black, upper
2 : white, lower
3 : red, upper
: green, lower
12 Remove the screw and
release the earth wire.
13 Disconnect the
connector [S80].
[S80]: four way valve coil
The harness of the four way
valve coil and the harness of
the reactor cross each other.
Step Procedure Points
(R14502)
Right
side
panel
Hook
Red
Earth wire
White
(R17482)
Black
(R17483)
Earth wire
(R14505)
[S80]
Reactor

Si001161 Removal of Electrical Box / PCB
Removal Procedure 9
14 Disconnect the
connector [S20], [S40],
[S90].
[S20]: electronic expansion
valve coil
[S40]: overload protector
[S90]: thermistors
15 Release the harnesses
of [S20], [S40], [S90]
from the groove.
16 Disconnect the
terminals of the reactor.
The colors of the harnesses
(orange or brown) do not
matter to the position of the
connector.
17 Disconnect the relay
connector of the
compressor.
Step Procedure Points
[S20][S40][S90]
(R16001)
(R16002)
Reactor Brown
(R14508)
Orange
(R16003)

Removal of Electrical Box / PCB Si001161
10 Removal Procedure
18 Release the harnesses
of the relay connector
and the reactor from the
groove.
19 Release the lead wires
of the power supply and
the earth wire from the
groove.
20 Remove the electrical
box cover and
insulation sheet.
Step Procedure Points
(R14510)
(R14581)
Electrical box cover
(R14511)
Insulation
sheet

Si001161 Removal of Electrical Box / PCB
Removal Procedure 11
21 Remove the 5 screws.
22 Unfasten the hook.
23 Remove the PCB.
[S20]: electronic expansion
valve coil
[S40]: overload protector
[S70]: fan motor
[S80]: four way valve coil
[S90]: thermistors
Step Procedure Points
(R14512)
(R14513)
(R14514)
PCB
[S90] [S40] [S20] [S80] [S70]
(R14515)

Removal of Electrical Box / PCB Si001161
12 Removal Procedure
2. Remove the electrical box. Some models have no
screw.
1Remove the screw and
remove the electrical
box.
3. Remove the reactor. Some models have more
screws.
1Remove the screw and
remove the reactor.
4. Remove the thermistors. Pay attention so as not to
lose the fixture.
When reassembling, do not
insert the thermistor up to
the dent of fixture.
1Release the discharge
pipe thermistor.
Step Procedure Points
Electrical box
(R15879)
Reactor
(R15885)
Discharge pipe
thermistor (R14518)
Dent
Fixture
(R11740)

Si001161 Removal of Electrical Box / PCB
Removal Procedure 13
2Cut the clamp. When reassembling, clamp
the outdoor heat exchanger
thermistor.
3Release the outdoor
heat exchanger
thermistor.
Take care not to lose the clip
of thermistor.
Step Procedure Points
(R15890)
Outdoor
heat exchanger thermistor (R14520)
Clip
Clip
(R11268)
Thermistor

Removal of Sound Blankets Si001161
14 Removal Procedure
4. Removal of Sound Blankets
Procedure 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.
Some models have more
screws.
1Remove the 2 screws.
2Remove the partition
plate.
When reassembling, fit the
lower hook into the bottom
frame.
(R15880)
(R14522)
Partition
plate
Hook
Bottom frame
Partition plate
(R14523)

Si001161 Removal of Sound Blankets
Removal Procedure 15
2. Remove the sound
blankets.
The design of sound
blankets is different
depending on the model.
Since the piping ports on the
sound blanket are torn
easily, remove the blanket
carefully.
Some models have only one
sound blanket (top).
1Lift and remove the
sound blankets (top
upper, top lower).
2Pull the sound blankets
(outer and inner 2) out.
3Pull the sound blanket
(inner) out.
Since the piping ports on the
sound blanket are torn
easily, remove the blanket
carefully.
Step Procedure Points
(R15851)
Sound blanket
(top upper)
Sound blanket
(top lower)
(R15886)
Sound blanket
(outer)
Sound blanket
(inner 2)
Sound blanket (inner)
(R15873)

Removal of Four Way Valve Si001161
16 Removal Procedure
5. Removal of Four Way Valve
Procedure 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 peripheries.
1Remove the screw and
remove the four way
valve coil.
2Remove the terminal
cover.
3Disconnect the
terminals of the
compressor.
4Remove the overload
protector.
(R14527)
Four way valve coil
(R14528)
Terminal cover
(R14529)
U(red)
V(yellow) W(blue)
Overload
protector

Si001161 Removal of Four Way Valve
Removal Procedure 17
5Remove the protection
bushing.
6Remove the electronic
expansion valve coil.
7Remove the putty.
Step Procedure Points
Protection bushing
(R14530)
Electronic expansion
valve coil
(R14531)
(R14532)

Removal of Four Way Valve Si001161
18 Removal Procedure
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.
Warning
Be careful not to get yourself
burnt with the pipes and
other parts that are heated by
the gas brazing machine.
Warning
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.) For the
sake of this, wrap the four
way valve with wet cloth and
provide water so that the
cloth does not dry.
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.
2. Remove the four way
valve.
1Heat up the brazed
point (a) and withdraw
the piping with pliers.
2Heat up the 3 brazed
points of the four way
valve. Disconnect the
point (b) first.
3Disconnect the points
(c) and (d).
Note:
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.
Step Procedure Points
(R14533)
(a)
(R14534)
(d)
(c)(b)