Daikin RXZ25NV1B User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Pair Type
2.5/3.5/5.0 kW Class
Si001362E

Service Manual
Removal Procedure
Outdoor Unit
zHeat Pump
RXZ25NV1B
RXZ35NV1B
RXZ50NV1B

Si001362E
Removal Procedure 1
Table of Contents
1. Humidifier Unit.........................................................................................2
2. Heater Assembly.....................................................................................4
3. Humidifying Rotor Motor .........................................................................6
4. Hygroscopic Fan Motor...........................................................................7
5. Humidifier Fan Assembly / Damper Assembly........................................8
6. Discharge Grille / Suction Grilles ..........................................................10
7. Outer Panels / Outdoor Fan / Fan Motor...............................................11
8. Duct Assembly / Right Side Panel ........................................................14
9. Electrical Box ........................................................................................16
10. PCB......................................................................................................19
11. Reactor / Thermistor Assembly / Partition Plate ..................................21
12. Sound Blankets ....................................................................................24
13. Four Way Valve / Electronic Expansion Valve .....................................25
14. Compressor..........................................................................................28
Note: The illustrations may be slightly different depending on the model.

Humidifier Unit Si001362E
2Removal Procedure
1. Humidifier Unit
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
2. Remove the top panel and
the stop valve cover.
1
2
3
Remove the 4 screws
and remove the top
panel.
Remove the screw of
the stop valve cover.
Slide the stop valve
cover down and remove
it.
(R19564)
Humidifier unit discharge
air outlet (front)
Humidifier unit
air inlet (front)
Humidifier
unit
(R19565)
Gas piping
Suction grille
(adsorption side)
Outdoor
temperature
thermistor
Suction grille
(humidifier side)
Humidifying
hose
Liquid
piping
Top panel
Hook
Hook
Stop valve cover
(R19566)

Si001362E Humidifier Unit
Removal Procedure 3
3. Remove the humidifier
unit.
1 Disconnect the relay
connectors of each
harness.
2 Remove the 4 screws
and remove the
humidifier unit.
When reassembling the
humidifier unit, do not forget
to connect the relay
connectors.
When reassembling the
humidifier unit, make sure to
connect the duct assembly
and the lower damper case
inside the humidifier unit.
Step Procedure Points
Relay connector
(R19568)
(R19569)
Humidifier unit
Duct assembly
(R19570)
Relay connector
Lower damper case

Heater Assembly Si001362E
4Removal Procedure
2. Heater Assembly
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1. Inner structure of the
humidifier unit
2. Remove the heater
assembly.
1
2
Release the harnesses
from the hook.
Remove the 3 screws
and remove the duct
(adsorption side).
3 Release the harnesses
from the 3 hooks.
When reassembling, these
harnesses must be fit in the
following hooks.
• Humidifying rotor motor
•Damper motor
•Limit switch
•Humidifying thermistor
→Hook (a) and hook (b)
•Hygroscopic fan motor
→Hook (b) and hook (c)
•Heater
→ Hook (c) only
Hook
Duct
(adsorption side)
Hygroscopic fan
motor harness
Heater
assembly
Humidifier
fan motor
Humidifying
rotor motor
Damper
motor
Humidifying
thermistor
(R19571)
Hook
Duct
(adsorption side)
(R19572)
Hook (a)
Hook (c) Hook (b)
(R19573)

Si001362E Heater Assembly
Removal Procedure 5
4 Remove the 2 screws
and remove the heater
assembly.
5 Unfasten the projection
of the heater assembly
from the slit on the
support plate.
When reassembling, insert
the projection of the heater
assembly to the slit on the
support plate.
Step Procedure Points
Heater assembly
(R19574)
Support plate
(R19575)

Humidifying Rotor Motor Si001362E
6Removal Procedure
3. Humidifying Rotor 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 humidifying
rotor.
1Release the
hygroscopic fan motor
lead wire from the hook.
2Remove the bell mouth.
3Remove the
humidifying rotor.
2. Remove the humidifying
rotor motor.
1
2
Disconnect the
humidifying rotor motor
lead wire.
Remove the 2 screws
and remove the
humidifying rotor motor.
Hook Hygroscopic fan motor
lead wire (R19576)
Bell mouth
(R19577)
(R19578)
Humidifying
rotor
(R19579)
Humidifying
rotor motor
Humidifying rotor
motor lead wire

Si001362E Hygroscopic Fan Motor
Removal Procedure 7
4. Hygroscopic 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 hygroscopic
fan.
Nut size: M6
When reassembling, align
the mark of the fan with
the D-cut section of the
motor shaft.
1 Remove the nut and
remove the hygroscopic
fan.
2. Remove the hygroscopic
fan motor.
1 Remove the 3 screws
and remove the
hygroscopic fan motor
cover.
2 Remove the
hygroscopic fan motor.
Nut
(R19580)
Hygroscopic fan 10 mm
(0.39 inch)
(R18954)
(R19581)
Hygroscopic fan motor cover
(R19582)
Hygroscopis fan motor

Humidifier Fan Assembly / Damper Assembly Si001362E
8Removal Procedure
5. Humidifier Fan Assembly / Damper Assembly
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 6 screws.
2Unfasten the 2 hooks
while bending the right
side panel.
3Remove the humidifier
fan assembly (front)
with the damper
assembly (back)
attached.
(R19583)
Hook
Hook
(R19584)
(R19585)
Humidifier fan assembly (front)
with damper assembly (back)

Si001362E Humidifier Fan Assembly / Damper Assembly
Removal Procedure 9
4Remove the 2 screws.
5Separate the humidifier
fan assembly from the
damper assembly.
The humidifying fan
assembly should be
replaced as an assembly
set. (Disassembling of the
assembly can cause a
noise.)
6Disconnect the damper
motor lead wire.
7 Turn the damper
assembly back and
disconnect the
terminals of the limit
switch.
Step Procedure Points
(R19586)
(R19587)
Damper
assembly
Humidifier
fan assembly
(R19588)
Damper motor lead wire
(R19589)
Limit
switch

Discharge Grille / Suction Grilles Si001362E
10 Removal Procedure
6. Discharge Grille / Suction Grilles
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 discharge
grille (upper).
1 Remove the 2 screws
and remove the
discharge grille (upper).
2. Remove the suction grille
(adsorption side).
1 Remove the screw and
remove the suction
grille (adsorption side).
3. Remove the suction grille
(humidifier side).
1 Remove the 2 screws
and remove the suction
grille (humidifier side).
Discharge grille (upper) (R19590)
(R19591)
Suction grille (adsorption side)
(R19592)
Suction grille
(humidifier side)

Si001362E Outer Panels / Outdoor Fan / Fan Motor
Removal Procedure 11
7. 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 shield plate
and the front panel.
1
2
3
Release the humidifier
unit relay harness from
the fixing point on the
shield plate.
Lift and remove the
shield plate.
Remove the 6 screws
of the front panel.
4 Unfasten the 5 hooks
and remove the front
panel.
When reassembling, make
sure to fit the 5 hooks.
2. Remove the discharge
grille (lower).
1
2
Remove the 4 screws
and slide the discharge
grille (lower) upward.
Unfasten the 6 hooks
and remove the
discharge grille.
Shield plate
Front panel
(R19593)
Hook
Hook
(R19594)
Hook
Hook
Hook (R19595)
Discharge grille
(lower)

Outer Panels / Outdoor Fan / Fan Motor Si001362E
12 Removal Procedure
3. Remove the outdoor fan.
1
2
Disconnect the
connector [S70].
Release the fan motor
lead wire from the 5
hooks.
[S70]: fan motor
3 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).
Step Procedure Points
Hook
[S70]
(R19596)
Hook
Nut
(R19597)
Outdoor fan
10 mm
(0.39 inch)
(R18954)
(R3249)
Lead wire Outdoor fan

Si001362E Outer Panels / Outdoor Fan / Fan Motor
Removal Procedure 13
4. Remove the fan motor.
1 Unfasten the 2 hooks
and release the fan
motor lead wire.
2 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
(R19598)
Hook
(R19599)

Duct Assembly / Right Side Panel Si001362E
14 Removal Procedure
8. Duct Assembly / Right Side Panel
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1. Disconnect the wires.
1
2
Remove the screws
and disconnect the
connecting wire and
power supply wire.
Remove the 3 screws
and remove the wire
fixture.
2. Remove the duct
assembly.
1 Remove the screw and
remove the duct
assembly.
3. Remove the suction grille.
1 Remove the 3 screws
of the suction grille.
Wire fixture Connecting wire Power supply wire
(R19600)
Hook
Humidifying
hose
(R19601)
Duct assembly
(R19602)
Suction
grille

Si001362E Duct Assembly / Right Side Panel
Removal Procedure 15
2 Slide the suction grille
to the right.
3 Unfasten the 5 hooks
and remove the suction
grille.
When reassembling, make
sure to fit the 5 hooks.
4. Remove the right side
panel.
1
2
3
Detach the outdoor
temperature thermistor.
Remove the 3 screws
on the right side panel.
Remove the earth /
ground screw.
4
5
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
(R19603)
(R19604)
Outdoor temperature thermistor
(R19605)
Earth /
ground screw
(R20299)
Hook
Connecting wire
Liquid piping
Gas piping
(R19606)
Hook
Right side
panel Hook
(R20300)

Electrical Box Si001362E
16 Removal Procedure
9. 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. Remove the electrical box
cover.
1Release the harnesses
for the humidifier unit
from the hook.
2
3
Remove the screw on
the electrical box cover.
Unfasten the 2 hooks of
the electrical box cover.
4 Lift up the electrical box
cover and remove it.
Hook
(R19607)
(R19608)
Slit
(R19609)
Electrical box cover You can check the LED A
(green) through slit.

Si001362E Electrical Box
Removal Procedure 17
2. Disconnect the harnesses.
1
2
Disconnect the
connector [S70].
Release the fan motor
harness from the 5
hooks.
[S70]: fan motor
3 Disconnect the
connectors
[S20][S80][S91].
[S20]:electronic expansion
valve coil
[S80]:four way valve coil
[S91]:liquid pipe thermistor
4 Disconnect the relay
harness for the
compressor.
5
6
Disconnect the
connector [S90].
Detach the clamp.
[S90]: thermistor assembly
Step Procedure Points
Hook
[S70]
Hook
(R19610)
[S20]
[S80]
[S91]
(R19611)
(R19612)
[S90]
Clamp
(R19613)

Electrical Box Si001362E
18 Removal Procedure
7 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.
3. Remove the electrical box.
1 Remove the screw in
front of the electrical
box.
2 Lift up the electrical box
and remove it.
Step Procedure Points
Reactor
(R19614)
Label
(R20301)
(R19615)
Electrical box
(R19616)