Daikin 3MKD75BVMA8 User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
5.8/6.8/7.1/7.5 kW Class
Outdoor Unit
Inverter
Multi Type
Si12-793

Service Manual
Removal Procedure
Outdoor Unit
zCooling Only zHeat Pump
3MKD75BVMA8 3MXD68BVMA8
2MKD58DVM 3MXS68EVMA
3MKD58DVM
3MKD75DVM
4MKD75DVM
4MKS71DVM
3MKS71ESG
3MKS75EVMA

Si12-793
Removal Procedure 1
Table of Contents
1. Removal of Outer Panels ........................................................................2
2. Removal of Electrical Box .......................................................................3
3. Removal of PCBs....................................................................................7
4. Removal of Fan Motor...........................................................................10
5. Removal of Sound Blankets..................................................................11
6. Removal of Coils / Thermistors .............................................................13
7. Removal of Four Way Valve / Defrost Solenoid Valve..........................15
8. Removal of Distributor...........................................................................17
9. Removal of Compressor .......................................................................18
Note: The illustrations may be slightly different depending on the model.
The illustrations are for heat pump models as representative.

Removal of Outer Panels Si12-793
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
1External appearance
2Remove the 4 screws of
the top panel and the 6
screws of the front panel.
3Remove the 4 screws of
the discharge grille.
4Remove the 2 screws of
the piping cover.
(R2159)
Top panel
Discharge grille
Front panel (R10351)
(R10352)
Piping cover

Si12-793 Removal of Electrical Box
Removal Procedure 3
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. Remove the connecting
wires.
1The figure shows the
connecting wires.
2Remove the terminal
board fixing screw.
Match the colors of the
connection wires to A, B and
C ports as follows.
(1) Black: Power supply
(2) White: Power supply
(3) Red: Transmission
The wires are fixed to the
terminal board with screws.
Electrical box
Electronic expansion
valve coils
Service monitor PCB
A port
B port
C port
Service port
(R3063)
Outdoor temperature thermistor
Liquid
pipe
Gas pipe
(R2163)
Terminal board fixing screw
Power supply
(L)–White
(N)–Black
A port
Earth / ground
wire
Wire fixing plate
B port C port
(R17637)

Removal of Electrical Box Si12-793
4Removal Procedure
3Pull out the terminal
board to open.
Glass tube fuse and varistor
cannot be replaced
individually because lead-
free soldering is provided.
2. Remove the harnesses.
1Disconnect the
connectors for the
electronic expansion
valve coils. [S20] [S21]
[S22].
2Remove the connector
for the four way valve
coil [S80].
The cooling only models do
not have the harness for
[S80].
3Disconnect the
connectors for the
thermistors [S90] [S92]
[S93] and the connector
for the overload
protector [S40].
[S40]: Overload protector
[S90]: Thermistor
(outdoor temperature,
outdoor heat exchanger,
discharge pipe)
[S92]: Gas pipe thermistor
[S93]: Liquid pipe thermistor
Step Procedure Points
(R2165)
Varister
Glass tube fuse
Screw
Terminal
board
[S20] [S21] [S22]
(R16025)
(R11729)
[S80]
[S40]
(R2168)
[S90] [S92] [S93]

Si12-793 Removal of Electrical Box
Removal Procedure 5
4Disconnect the relay
connector of the
compressor.
5Remove the reactor
lead wires.
3. Remove the wire fixing
plate.
1Remove the 2 screws
of the wire fixing plate.
4. Remove the electrical
box.
1Remove the screw of
the electrical box.
Step Procedure Points
(R2169)
Reactor
(R2170)
(R11309)
Wire fixing
plate
(R2172)

Removal of Electrical Box Si12-793
6Removal Procedure
2Remove the screw of
the electrical box.
3Remove the drip proof
cover.
4Disconnect the
connector for the fan
motor [S70] from the
inverter PCB.
5Lift up the electrical box
and dismount it.
Step Procedure Points
(R2173)
Drip
proof
cover
(R2174)
Inverter PCB
[S70]
(R2175)
(R2176)

Si12-793 Removal of PCBs
Removal Procedure 7
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 and the
main PCB.
When reassembling, insert
the base bar into the hole of
the main PCB.
1Remove the screw of
the main PCB, and
unfasten the 2 hooks.
2Unfasten the hook of
the terminal board, and
open the terminal
board.
3Disconnect each
connector [S11] [HE]
[HL] [HN] on the back of
the terminal board.
4Disconnect the
connectors [S52]
[S102] from the service
monitor PCB.
Main PCB
(R2177)
Base bar
(R2178)
Hook
[S11] [HL] [HN]
(R17403)
[HE]
(R17347)
[S102]
[S52]
Service monitor PCB

Removal of PCBs Si12-793
8Removal Procedure
5Lift up the main PCB.
6Disconnect the
connectors [S31] [S32]
[S33] [S71] [H1] [H2].
7The figure shows the
main PCB.
Step Procedure Points
(R2181)
[S31] [S71] [S33] (R10362)
[H1] (yellow)
[S32]
[H2] (blue)
(R10363)
[S80]
[S21] [S20] [S40]
[S31]
[S71]
[S33]
[S32]
[H2]
[H1]
FU2 (3.15A)
[S90]
[S92]
[S93]
(R10356)