Daikin Super Multi NX 3MKS50E3V1B User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
4.0/5.0/5.2/5.8/6.8/7.5 kW Class
Outdoor Unit
Inverter
Multi Type
Si121174

Service Manual
Removal Procedure
Outdoor Unit
Applicable Models
zCooling Only zHeat Pump
3MKS50E3V1B 3MXS40K2V1B
3MKS58EVMA 3MXS52E3V1B
3MKS58KVM 3MXS52EVMA
4MKS58E3V1B 3MXS52KVM
4MKS75F2V1B
3MXS68G2V1B
4MXS68F2V1B

Si121174
Removal Procedure 1
Table of Contents
1. Removal of Outer Panels ........................................................................2
2. Removal of Electrical Box .......................................................................6
3. Removal of PCBs..................................................................................14
4. Removal of Outdoor Fan / Fan Motor ...................................................19
5. Removal of Sound Blankets..................................................................21
6. Removal of Coils / Thermistors .............................................................25
7. Removal of Distributor...........................................................................28
8. Removal of Four Way Valve .................................................................29
9. Removal of Compressor .......................................................................30
Note: The illustrations may be slightly different depending on the model.
The illustrations are for heat pump models as representative.

Removal of Outer Panels Si121174
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
1Appearance features Take care not to cut your
finger by the fins of the heat
exchanger.
2Remove the 4 screws
(2 on both sides) of the
top panel.
(R5494)
(R12898)
Top panel
(R12899)

Si121174 Removal of Outer Panels
Removal Procedure 3
3Remove the 6 screws
of the front panel.
4Remove the screw of
the shield plate.
5Slide the shield plate to
the left to unfasten the
hooks and remove the
shield plate.
6Unfasten the upper 2
hooks.
Align the position of hole of
the upper hook to pull the
front panel out.
Step Procedure Points
Front panel
(R17165)
Shield plate
(R11204)
(R5499)
(R5500)

Removal of Outer Panels Si121174
4Removal Procedure
7Lift the front panel up to
unfasten the left side
hooks.
The front panel has 3 hooks
on the left.
8Unfasten the right side
hook and remove the
front panel.
Step Procedure Points
(R5501)
Hook
(R12901)
(R5503)
Hook

Si121174 Removal of Outer Panels
Removal Procedure 5
9Remove the 4 screws
of the discharge grille.
10
11
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)

Removal of Electrical Box Si121174
6Removal Procedure
2. Removal of Electrical Box
Procedure 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.
The illustrations are for 3-
room models as
representative, 4-room
models also have D port.
1Layout of the
connecting wires
The wires are fixed to the
terminal board with screws.
Connecting wires
(1) Black : Power supply
(2) White : Power supply
(3) Red : Transmission
Power Supply wires
(L) - Black
(N) - White
Electrical
box
Electronic expansion
valve coil
Service port
A port
B port
C port
(R11175)
Liquid
pipe
Liquid stop valve
Gas stop valve
Gas pipe
(R11176)
(R17256)
Wiring fixture
C port
A port B port
Service
monitor
PCB
Terminal
board
Earth
wire

Si121174 Removal of Electrical Box
Removal Procedure 7
2Detach the fixing tape
of the electrical box
cover.
3Unfasten the 4 hooks at
the mark of the
electrical box cover.
4Lift the electrical box
cover up and remove it.
5Detach the clamp and
disconnect the
connector for the fan
motor [S70].
When reassembling, insert
the clamp into the either hole
as below.
Some models have no ferrite
core for the harness of [S70].
Step Procedure Points
(R5512)
Fixing
tape
(R5513)
(R5514)
(R17166)
[S70]
For the ferrite
core of fan
motor harness
(R17167)

Removal of Electrical Box Si121174
8Removal Procedure
6Release the fan motor
lead wire from the
hooks.
7Disconnect the
connectors for the
electronic expansion
valve coils.
[S20] (white) : room A
[S21] (red) : room B
[S22] (blue) : room C
4-room models also have
[S23] (yellow) for room D.
8Pull out the clamp. When reassembling, insert
the clamp of the electronic
expansion valve coil ASSY
into either hole as below.
Step Procedure Points
Fan motor
lead wire
(R17168)
(R5518)
(R5519)
[S20] [S21] [S22]
(R5520)
Electronic expansion valve coil
(R17170)

Si121174 Removal of Electrical Box
Removal Procedure 9
9Disconnect the
connector for the
overload protector
[S40].
10 The wire harness for
the compressor is
attached to the partition
plate by the clamp.
11 Pull out the clamp with
pliers.
12 Disconnect the relay
connector of the
compressor.
Step Procedure Points
(R5521)
[S40]
Clamp
(R12904)
Partition
plate
Clamp
(R6423)
(R5522)

Removal of Electrical Box Si121174
10 Removal Procedure
13 Disconnect the 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.
14 Disconnect the
connector for the four
way valve coil [S80].
Step Procedure Points
(R5523)
[S90] [S92] [S93]
(R5524)
(R17169)
[S90]
[S92]
[S93]
(R5525)
(R5526)
[S80]

Si121174 Removal of Electrical Box
Removal Procedure 11
15 The figure shows the
arrangement of the wire
harnesses under the
electrical box.
16 Pull out the clamp of the
thermistor lead wire.
2. Remove the electrical
box.
1Remove the 2 screws
of the earth wires.
2Remove the screws on
the terminal board and
disconnect all the
connecting wires and
power supply wire.
Step Procedure Points
(R5527)
Thermistor lead wire
(R17257)
Fixing position for the
thermistor harness
When reassembling, insert
the clamp into the small hole.
(R11178)
(R11179)

Removal of Electrical Box Si121174
12 Removal Procedure
3Remove the 2 screws
and remove the wiring
fixture.
4Detach the outdoor
temperature thermistor.
5Remove the screw on
the right side of the
electrical box.
Step Procedure Points
(R11180)
(R11181)
Wiring
fixture
(R5533)
(R17258)

Si121174 Removal of Electrical Box
Removal Procedure 13
6Remove the screw of
the electrical box.
7Lift up and remove the
electrical box.
Step Procedure Points
(R17259)
(R5536)

Removal of PCBs Si121174
14 Removal Procedure
3. Removal of PCBs
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 service
monitor PCB.
1External appearance
2Remove the screw of
the terminal board and
open it.
3Disconnect the
connectors [S52]
[S102] from the service
monitor PCB.
Service monitor PCB Terminal board
(R5537)
(R5538)
(R5539)
(R5540)
Service monitor PCB
[S102]
[S52]

Si121174 Removal of PCBs
Removal Procedure 15
4Unfasten the upper
hook and pull the
service monitor PCB
upward to remove.
2. Remove the main PCB.
[AC1] [AC2] : for power supply
[S10] : for transmission
1Disconnect the
connectors for the
terminal board on the
right side.
2Disconnect the 2
connectors for the
reactor on the left side.
3Remove the 3 screws
of the main PCB.
Step Procedure Points
(R5541)
(R5542)
[AC1]
brown
[AC2]
blue
[S10]
(R5543)
(R5544)
[HR2]
[HR1]
Reactor
Main PCB
(R5545)

Removal of PCBs Si121174
16 Removal Procedure
4Unfasten the 3 hooks
on the reactor side and
slide the main PCB to
the left.
5Release the relay
harness for the
compressor from the
hook.
6Lift up the main PCB
and remove it.
In working, be careful not to
break the main PCB with the
excessive force because the
main PCB and the radiation
fin are adhered to one
another.
Step Procedure Points
(R5547)
(R5548)
(R5549)
(R5550)
Relay harness for compressor
Earth wire

Si121174 Removal of PCBs
Removal Procedure 17
7Remove the 2 screws
of the radiation fin.
When reassembling, make
sure to use the silicon
grease.
Silicon grease
Part No.: 1172698
8Remove the 3 screws
of the reactor.
Step Procedure Points
[S70] [S40] [S20]
[S51] [S90] [S92] [S93]
[S21] [S22][S23]
[S80]
[S101]
[S10]
[S15]
(R6963)
Clamp for reactor harness
(R11207)
(R5553)
Radiation fin
Reactor
(R11208)

Removal of PCBs Si121174
18 Removal Procedure
3. Remove the terminal
board.
1Disconnect all the wire
harnesses from the
back of the terminal
board.
2Unfasten the hook of
the electrical box and
remove the terminal
board.
Step Procedure Points
(R12907)
Terminal board (back)
(R5556)
(R5557)
(R5558)