Daikin 4MXL36TVJU User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Multi Type
36000/48000 Btu/h Class
Si121858E

Service Manual
Removal Procedure
Outdoor Unit
Heat Pump
4MXL36TVJU
5MXS48TVJU

Si121858E
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Outdoor Fan / Fan Motor.........................................................................5
3. PCB.........................................................................................................8
4. Thermistor ASSY / Electronic Expansion Valve Coil for
Bypass Circuit / Four Way Valve Coil ...................................................12
5. Electrical Box / Partition Plate / Sound Blankets...................................16
6. Gas / Liquid Pipe Thermistor ASSY ......................................................18
7. Electronic Expansion Valve...................................................................19
8. Four Way Valve / Electronic Expansion Valve for Bypass Circuit.........21
9. Compressor...........................................................................................23
Note: The illustrations may be slightly different depending on the model.

Outer Panels Si121858E
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 10 screws
and remove the top
panel.
2 Remove the 6 screws
and remove the right
side panel.
When reassembling, make
sure that the 2 hooks are
securely fastened.
3 Remove the screw and
remove the front panel
(2).
Top panel
(R25751)
Right side
panel
(R25752)
(R25753)
Front panel (2)
(R25754)

Si121858E Outer Panels
Removal Procedure 3
4 Remove the 8 screws
of the front panel (1).
5 Slide the fan motor
fixing frame to the left
and unfasten the 2
hooks.
6 Unfasten the hook and
remove the front panel
(1).
Step Procedure Points
Front
panel (1)
(R25755)
Hook
Fan motor fixing frame
(R25756)
Hook
(R25757)

Outer Panels Si121858E
4Removal Procedure
7 Remove the 4 screws
of the discharge grille.
8 Unfasten the 4 hooks
and remove the
discharge grille.
When reassembling, make
sure that the 4 hooks are
securely fastened.
Step Procedure Points
Discharge grille
(R25758)
Hook
Hook
(R25759)

Si121858E Outdoor Fan / Fan Motor
Removal Procedure 5
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 outdoor fan /
fan motor.
When reassembling, make
sure that the 2 hooks are
securely fastened.
Also, make sure not to
squash the harness.
1
2
Remove the 2 screws.
Slide upward and
remove the shield plate.
3
4
Disconnect the
connector [S70].
Cut the clamp.
[S70]: fan motor
5
6
Release the fan motor
lead wire from the 6
hooks and the groove.
Detach the wire clamp
material from the fan
motor lead wire.
When reassembling, wrap
around with the wire clamp
material 2 times or more
around the fan motor lead
wire at the position of the
clamp.
Shield plate
(R25760)
(R25761)
Clamp
[S70]
(R25762)
Wire clamp material Groove Hook
Hook
Fan motor
lead wire
(R25763)
(to fan motor)
(to main PCB)
Clamp Wire
clamp
material
(R25764)

Outdoor Fan / Fan Motor Si121858E
6Removal Procedure
7 Remove the nut and
remove the outdoor fan.
Nut size: M8
When reassembling, align
the mark of the outdoor fan
with the D-cut section of the
motor shaft.
8 Remove the 4 screws
and remove the fan
motor.
When reassembling, put the
fan motor lead wire through
the hole of the fan motor
mounting plate so as not to
be entangled with the
outdoor fan.
Step Procedure Points
D-cut
Outdoor fan
Washer
Nut
Mark
(R25765)
13 mm
(1/2 inch)
(R18965)
Fan motor
(R25766)
Lead wire Outdoor fan
(R3249)

Si121858E Outdoor Fan / Fan Motor
Removal Procedure 7
2. Tips for removing the fan. Fan and fan motor can be
removed without removing
the front panel (1).
1
2
3
4
Remove the top panel
and front panel (2) and
the right side panel.
Remove the shield
plate.
Disconnect the
connector [S70] and
release the fan motor
lead wire.
Remove the screw, and
unfasten the 2 hooks of
the fan motor fixing
frame.
5
6
Remove the 2 screws
at the bottom from the
top.
Pull out the fan motor
fixing frame and
outdoor fan from the
top.
Use a long screwdriver or a
jig.
For easy access to the
bottom part, top part of the
fan motor fixing frame can
be removed by removing 4
screws.
Step Procedure Points
Hook
Fan motor fixing frame
(R25767)
(R25768)
(R25853)

PCB Si121858E
8Removal Procedure
3. PCB
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.
1 Remove the 3 screws
and open the refrigerant
pipe fixing cover.
2
3
Disconnect the
connectors for
electronic expansion
valves.
Disconnect the 3
connectors.
[S20](white): room A
[S21](red): room B
[S22](blue): room C
[S23](yellow): room D
[S24](white): room E (5-room
model only)
[S40]: overload protector
[S201], [S202]: service monitor
PCB
4 Disconnect the 4
connectors.
[S25](red): electronic expansion
valve for bypass
circuit
[S90]: thermistor ASSY
[S92]: gas pipe thermistors
[S93]: liquid pipe thermistors
Refrigerant
pipe fixing
cover
(R25769)
[S202]
[S201]
[S40]
[S20]
[S21]
[S22] [S23] [S24] (R25770)
[S93]
[S25]
[S90] [S92] (R25771)