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)

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