Daikin 2MXS18NMVJU User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
18000/24000/36000 Btu/h Class
Outdoor Unit
Inverter
Multi Type
Si121558EA

Service Manual
Removal Procedure
Outdoor Unit
zHeat Pump
2MXS18NMVJU
3MXS24NMVJU
4MXS36NMVJU
2MXL18QMVJU
3MXL24QMVJU

Si121558EA
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Outdoor Fan / Fan Motor.........................................................................4
3. Right Side Panel / Electrical Box.............................................................6
4. PCBs .....................................................................................................11
5. Thermistor ASSYs.................................................................................16
6. Electronic Expansion Valve Coil ASSY.................................................18
7. Partition Plate / Sound Blankets............................................................19
8. Four Way Valve.....................................................................................21
9. Compressor...........................................................................................23
Note: The illustrations may be slightly different depending on the model.

Outer Panels Si121558EA
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 6 screws
and remove the top
panel.
2 Remove the 8 screws
of the front panel.
3 Slide the fan motor
fixing frame to the left
and unfasten the 2
hooks.
Top panel
(R22351)
Front panel
(R22278)
Hook
Fan motor fixing frame
(R22279)

Si121558EA Outer Panels
Removal Procedure 3
4
5
Unfasten the 2 hooks
on the right side.
Remove the front panel.
When reassembling, make
sure that the 2 hooks are
securely fastened.
6 Remove the 4 screws
of the discharge grille.
7 Unfasten the 2 hooks
and remove the
discharge grille.
When reassembling, make
sure that the 2 hooks are
securely fastened.
Step Procedure Points
Front panel
Hook
(R22280)
Discharge grille
(R22281)
Hook
(R22282)

Outdoor Fan / Fan Motor Si121558EA
4Removal Procedure
2. 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 drip proof
cover.
2 Disconnect the
connector [S70].
[S70]: fan motor
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.
3 Release the fan motor
lead wire from the
groove and the hook.
Drip proof cover
(R22283)
[S70]
(R22284)
Lead wire Outdoor fan
(R3249)
Hook Groove
Fan motor lead wire
(R22285)

Si121558EA Outdoor Fan / Fan Motor
Removal Procedure 5
4 Remove the nut and
remove the outdoor fan.
Nut size: M8
When reassembling, align
the mark of the fan rotor
with the D-cut section of the
motor shaft.
5 Remove the 2 screws
and remove the fan
motor fixing frame.
When reassembling, fit the 2
lower hooks into the bottom
frame.
6 Unfasten the 3 hooks
on the fan motor fixing
frame and release the
fan motor lead wire.
7 Remove the 4 screws
and remove the fan
motor.
Step Procedure Points
Nut
D-cut
Outdoor fan
(R22286)
13 mm
(0.51 inch)
(R18965)
Fan motor fixing frame
(R22287)
Hook
(R20916)
Hook
Fan motor
lead wire
(R22288)
Fan motor (R22289)

Right Side Panel / Electrical Box Si121558EA
6Removal Procedure
3. Right Side Panel / 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 terminal
cover.
1 Remove the 2 screws
of the terminal cover.
2
3
Open the terminal cover
and pull down to
unfasten the 2 hooks.
Remove the terminal
cover.
When reassembling, make
sure that the 2 hooks are
securely fastened.
2. Remove the right side
panel.
When reassembling, make
sure that the 2 hooks are
securely fastened.
1 Slide the drip proof
plate up to unfasten the
2 hooks and remove it.
Terminal cover
(R22290)
Hook
(R22291)
Hook
Drip proof plate
(R22292)

Si121558EA Right Side Panel / Electrical Box
Removal Procedure 7
2 Remove the 19 screws
on the 5 terminal
boards and disconnect
the 4 connecting wires
(Room A, B, C, D) and
power supply wire.
3 Loosen the 5 lock nuts
and remove 5 conduits
together with the 4
connecting wires
(Room A, B, C, D) and
the power supply wire.
2-room model has no
connector for room C and D.
3-room model has no
connector for room D.
2-room model has no
conduit for room C and D.
3-room model has no
conduit for room D.
4
5
Remove the 3 screws.
Slide the stop valve
cover downward and
remove it.
When reassembling, make
sure to fit the 3 hooks.
6 Remove the 2 screws.
Step Procedure Points
Room A
Room C
Room D
Room B
Connecting wire
(Room A)
Connecting wire
(Room B)
Power supply
wire
Terminal board
power supply
Connecting wire
(Room C)
Connecting wire
(Room D)
(R22293)
Lock nut
Conduit
Conduit
Lock nut (R22294)
Stop valve cover
(R22295)
Hook
Hook (R22296)
(R22297)

Right Side Panel / Electrical Box Si121558EA
8Removal Procedure
7 Remove the 4 screws.
8
9
10
Release the outdoor
temperature thermistor
from the slit.
Remove the 3 screws.
Unfasten the 2 hooks
and remove the right
side panel.
Some models do not have a
slit for outdoor temperature
thermistor harness.
When reassembling, make
sure that the 2 hooks are
securely fastened.
3. Remove the electrical
box.
[S92]: gas pipe thermistor
[S93]: liquid pipe thermistor
1 Remove the 2
connectors for
thermistor.
Step Procedure Points
(R22298)
Right side panel
Slit Outdoor
temperature
thermistor
(R22299)
Hook
(R22300)
[S92][S93]
(R22301)