Daikin 3MKS50ESG User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
4.0/5.0/5.2/5.8/6.8 kW Class
Outdoor Unit
Inverter
Multi Type
Si121291EC

Service Manual
Removal Procedure
Outdoor Unit
zCooling Only zHeat Pump
3MKS50ESG 3AMX52E4V1B
3MKS50FSG 3MXS40K3V1B
3MKS58KVM 3MXS52E4V1B
3MKS58LVMA 3MXS52KVM
3MKS58LVMA9
3MXS52LVMA
3MKS68LVMA 3MXS52LVMA9
3MKS68LVMA9
3MXS68G3V1B
3MXS68LVMA
3MXS68LVMA9
4MXS68F3V1B

Si121291EC
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Electrical Box ..........................................................................................4
3. PCBs .......................................................................................................9
4. Fan Motor..............................................................................................12
5. Sound Blankets .....................................................................................13
6. Coils / Thermistors ................................................................................16
7. Distributor..............................................................................................18
8. Four Way Valve.....................................................................................19
9. Compressor...........................................................................................20
Note: The illustrations may be slightly different depending on the model.
The illustrations are for heat pump models as representative.

Outer Panels Si121291EC
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
1Remove the 4 screws
and remove the top
panel.
The illustrations are for 3-
room models as
representative.
2Remove the 6 screws
of the front panel.
3Remove the screw of
the shield plate.
4Unfasten the 2 hooks
and remove the shield
plate.
5Unfasten the 4 hooks
and remove the front
panel.
Front panel
(R17891)
Top panel
Shield plate
(R11204)
(R17754)
Hook
Hook
(R17755)
Hook

Si121291EC Outer Panels
Removal Procedure 3
6Remove the 4 screws
and remove the
discharge grille.
7
8
Remove the 2 screws
of the stop valve cover.
Slide the stop valve
cover downward and
remove it.
When reassembling, make
sure to fit the 5 hooks.
Step Procedure Points
Discharge grille
(R12902)
(R11206)
Stop valve cover
(R5506)
(R5508)

Electrical Box Si121291EC
4Removal Procedure
2. 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. Disconnect the
harnesses.
1Peel off the fixing tape.
2Unfasten the 4 hooks
and remove the
electrical box cover.
3Detach the clamp and
disconnect the
connector [S70].
[S70]: fan motor
When reassembling, insert
the clamp into either hole as
below.
Some models have no ferrite
core for the harness of [S70].
4Release the fan motor
lead wire from the
hooks.
(R18379)
Electrical box cover
Fixing tape
Hook
Hook
(R17166)
[S70]
For the ferrite
core of fan
motor harness
(R17167)
Fan motor
lead wire
(R17168)

Si121291EC Electrical Box
Removal Procedure 5
5Disconnect the
connectors for the
electronic expansion
valve coil.
[S20] (white) : room A
[S21] (red) : room B
[S22] (blue) : room C
The 4-room model has
[S23] (yellow) for room D.
When reassembling, insert
the clamp of the electronic
expansion valve coil ASSY
into either hole as below.
6Pull out the clamp.
7Disconnect the
connector [S40].
[S40] : overload protector
8 Pull out the clamp with
pliers.
9Disconnect the relay
connector of the
compressor.
Step Procedure Points
(R18380)
Clamp
[S20] [S21] [S22]
For the electronic expansion
valve coil
(R20759)
(R5521)
[S40]
Clamp
(R12904)
Partition
plate
(R5522)

Electrical Box Si121291EC
6Removal Procedure
10 Disconnect each
connector.
[S90] : thermistors
[S92] : gas pipe thermistors
[S93] : liquid pipe thermistors
When reassembling, insert
each clamp of the thermistor
harnesses into the holes as
below.
50/58 class
3MXS52KVM, 3MXS52LVMA(9)
40/68 class
3AMX52E4V1B, 3MX52E4V1B
11 Disconnect the
connector [S80].
[S80] : four way valve coil
The cooling only models
have no harness for [S80].
12 Pull out the clamp of the
thermistor lead wire.
Step Procedure Points
(R5523)
[S90] [S92] [S93]
(R20760)
For [S90]
For [S92]
For [S93]
(R20761)
For [S90]
For [S92]
For [S93]
(R5526)
[S80]
Thermistor lead wire
(R18635)
Fixing position for the
thermistor harness
When reassembling, insert
the clamp into the small
hole.

Si121291EC Electrical Box
Removal Procedure 7
2. Remove the electrical
box.
1Remove the 2 screws
of the earth / ground
wires.
2Remove the screws on
the terminal board and
disconnect all the
connecting wires and
the power supply wire.
3Remove the 2 screws
and remove the wire
fixture.
4Detach the outdoor
temperature thermistor.
5Remove the screw on
the right side of the
electrical box.
Step Procedure Points
(R20762)
Earth /
ground
wire
(R17759)
Wire fixture
(R5533)
(R17893)

Electrical Box Si121291EC
8Removal Procedure
6Remove the screw of
the electrical box.
7Lift up and remove the
electrical box.
Step Procedure Points
(R17760)