Daikin 3MKS71ESG User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
6.8/7.1/7.5 kW Class
Outdoor Unit
Inverter
Multi Type
Si121294EA

Service Manual
Removal Procedure
Outdoor Unit
zCooling Only zHeat Pump
3MKS71ESG 3MXS68KVM
3MKS71FSG
3MKS75KVM

Si121294EA
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Electrical Box ..........................................................................................3
3. PCBs .......................................................................................................7
4. Fan Motor..............................................................................................10
5. Sound Blankets .....................................................................................11
6. Coils / Thermistors ................................................................................13
7. Four Way Valve.....................................................................................15
8. Distributor..............................................................................................16
9. Compressor...........................................................................................17
Note: The illustrations may be slightly different depending on the model.
The illustrations are for heat pump models as representative.

Outer Panels Si121294EA
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 of
the top panel and the 6
screws of the front panel.
2Remove the 4 screws of
the discharge grille.
3Remove the screw of the
shield plate.
4Unfasten the 2 hooks
and remove the shield
plate.
5Remove the 2 screws of
the stop valve cover.
Top panel
Discharge grille Front panel
(R10351)
Shield plate
(R11204)
(R17754)
Hook
(R17931)
Stop valve
cover

Si121294EA Electrical Box
Removal Procedure 3
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
1Disconnect the
connectors for the
electronic expansion
valve coils [S20] [S21]
[S22].
[S20]: white
[S21]: red
[S22]: blue
2Remove the connector
for the four way valve
coil [S80].
The cooling only models
have no harness for [S80].
When reassembling, insert
the clamp into the hole as
below.
3Disconnect the
connectors for the
thermistors [S90] [S92]
[S93] and the connector
for the overload
protector [S40].
[S90]: thermistors
(outdoor temperature,
outdoor heat exchanger,
discharge pipe)
[S92]: gas pipe thermistors
[S93]: liquid pipe thermistors
When reassembling, insert
the clamp of the thermistor
ASSY harness into the hole
as below.
When reassembling, insert
the clamp of the electronic
expansion valve coil harness
into the hole as below.
4Disconnect the relay
connector of the
compressor.
[S20] [S21] [S22]
(R16025)
(R11729)
[S80]
Clamp
(R17397)
[S40]
(R2168)
[S90] [S92] [S93]
Thermistor ASSY harness
(R17797)
for [S92]
for [S93]
Electronic expansion
valve coil harness
(R17798)
(R2169)

Electrical Box Si121294EA
4Removal Procedure
5Release the clamp with
pliers.
6Disconnect the reactor
lead wires.
When reassembling, insert
each clamp into the holes as
below.
When reassembling, the
thermistor harness should
be placed between the
electrical box and the reactor
harness as below.
7Remove the screws
and disconnect the
connecting wires,
power supply wires,
and earth wires.
8Remove the 2 screws
of the wire fixture.
Step Procedure Points
(R17066)
Reactor
(R2170)
Reactor
harness
Thermistor
ASSY
(R17884)
Reactor harness
Thermistor
ASSY
harness
(R17800)
Power supply wire
Earth wire
Connecting
wire
Connecting
wire
(R17791)
Wire fixture

Si121294EA Electrical Box
Removal Procedure 5
9Remove the screw of
the electrical box.
10 Remove the screw of
the electrical box.
11 Remove the drip proof
cover.
Step Procedure Points
(R17792)
(R2173)
Drip
proof
cover
(R2174)

Electrical Box Si121294EA
6Removal Procedure
12 Disconnect the
connector for the fan
motor [S70] from the
inverter PCB.
13 Lift up the electrical box
and remove it.
Step Procedure Points
Inverter PCB
[S70]
(R2175)
(R2176)
Electrical box

Si121294EA PCBs
Removal Procedure 7
3. PCBs
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.
1Remove the screw of
the main PCB and
release the 2 hooks.
2Remove the screw and
release the hook of the
terminal board, and
open the terminal
board.
3Disconnect each
connector on the back
of the terminal board.
(1) white (10) black
(2) blue (11) white
(3) black (12) yellow
(4) brown (13) black
(5) green / yellow (14) black
(6) brown (15) white
(7) red (16) blue
(8) white (17) white
(9) black
Main PCB
Base bar
(R2177)
(R11731)
Terminal board
Hook
(R6575)
(3) (4) (5) (6) (7) (8) (9)
(10)(11)(12)
(13)
(2)
(1)
(17)
(16)
(15) (14)
(R17885)

PCBs Si121294EA
8Removal Procedure
4Detach the fixing tape
for the drip proof plate.
5Remove the drip proof
plate.
6Disconnect the
connectors [S52]
[S102] from the service
monitor PCB.
7Release the 2 hooks to
remove the service
monitor PCB.
8Remove the service
monitor PCB.
9Lift up the main PCB.
Step Procedure Points
(R17794)
Drip proof plate
Fixing tape
(R6578)
[S102]
[S52]
Service
monitor PCB
(R6579)
Hook
Hook
Main PCB
(R17795)