Daikin 3MKS75KVM, 3MKS75EVMA, 2MXS18GVJU, 3MXS68EVMA, 3MXS68KVM Service Manual
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REMOVAL
PROCEDURE
SERVICE MANUAL
6.8/7.5 kW Class
18000 Btu/h Class
Outdoor Unit
Inverter
Multi Type
Si121175
Service Manual
Removal Procedure
Outdoor Unit
Applicable Models
zCooling Only zHeat Pump
3MKS75EVMA 2MXS18GVJU
3MKS75KVM 3MXS68EVMA
3MXS68KVM
Si121175
Removal Procedure 1
Table of Contents
1. Removal of Outer Panels........................................................................2
2. Removal of Electrical Box (Pattern 1) .....................................................3
3. Removal of Electrical Box (Pattern 2) .....................................................7
4. Removal of PCBs (Pattern 1)................................................................12
5. Removal of PCBs (Pattern 2)................................................................16
6. Removal of Fan Motor...........................................................................19
7. Removal of Sound Blankets..................................................................20
8. Removal of Coils / Thermistors.............................................................22
9. Removal of Four Way Valve / Defrost Solenoid Valve..........................24
10.Removal of Distributor...........................................................................26
11.Removal of Compressor .......................................................................27
Note:
The illustrations may be slightly different depending on the model.
The illustrations are for heat pump models as representative.
Removal of Outer Panels Si121175
2 Removal 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
1
External appearance
2
Remove the 4 screws of
the top panel and the 6
screws of the front panel.
3
Remove the 4 screws of
the discharge grille.
4
Remove the 2 screws of
the piping cover.
(R2159)
Top panel
Discharge grille
Front panel
(R10351)
(R10352)
Piping cover
Si121175 Removal of Electrical Box (Pattern 1)
Removal Procedure 3
2. Removal of Electrical Box (Pattern 1)
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.
1
The figure shows the
connecting wires.
2
Remove 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 (Pattern 1) Si121175
4 Removal Procedure
2. Remove the harnesses.
1
Disconnect the
connectors for the
electronic expansion
valve coils. [S20] [S21]
[S22].
2
Remove the connector
for the four way valve
coil [S80].
3
Disconnect 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
4
Disconnect the relay
connector of the
compressor.
Step
Procedure Points
[S20] [S21] [S22]
(R16025)
(R11729)
[S80]
[S40]
(R2168)
[S90] [S92] [S93]
(R2169)
Si121175 Removal of Electrical Box (Pattern 1)
Removal Procedure 5
5
Remove the reactor
lead wires.
3. Remove the wire fixing
plate.
1
Remove the 2 screws
of the wire fixing plate.
4. Remove the electrical
box.
1
Remove the screw of
the electrical box.
2
Remove the screw of
the electrical box.
Step
Procedure Points
Reactor
(R2170)
(R11309)
Wire fixing
plate
(R2172)
(R2173)
Removal of Electrical Box (Pattern 1) Si121175
6 Removal Procedure
3
Remove the drip proof
cover.
4
Disconnect the
connector for the fan
motor [S70] from the
inverter PCB.
5
Lift up the electrical box
and dismount it.
Step
Procedure Points
Drip
proof
cover
(R2174)
Inverter PCB
[S70]
(R2175)
(R2176)
Si121175 Removal of Electrical Box (Pattern 2)
Removal Procedure 7
3. Removal of Electrical Box (Pattern 2)
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
connecting wires.
The US model has a
protection plate on the right
side panel.
Remove the 2 screws to
remove the protection plate.
1
Remove the terminal
board fixing screw.
The wires are fixed to the
terminal board with screws.
2
Remove all the screws
of the connecting wires
and the power supply
wires.
3
Remove the screw of
the ground wire.
2. Remove the harnesses.
[S20]: White
[S21]: Red
Bundle the harnesses of the
electronic expansion valve
coil with clamp.
Pull out the clamp.
When reassembling, insert
the clamp into one of the
holes.
1
Disconnect the 2
connectors for the
electronic expansion
valve coil [S20] [S21].
Liquid (room A)
Liquid (room B)
Gas (room A)
Gas (room B)
(R17343)
Electronic expansion
valve coil
Conduit
Lock nut
Conduit
mounting plate
Screw
(R17395)
Protection plate
R
oom
A
R
oom
B
Terminal board fixing screw
Power supply
Ground wire
(R17344)
[S20] [S21]
(R17400)
For the electronic
expansion valve coil
(R17396)
Removal of Electrical Box (Pattern 2) Si121175
8 Removal Procedure
2
Disconnect the
connector for the four
way valve coil [S80].
When reassembling, insert
the clamp into the hole as
below.
3
Disconnect the
connectors for the
thermistors [S90] [S92]
[S93] and the overload
protector [S40].
[S40]: overload protector
[S90]: thermistors
(outdoor temperature,
outdoor heat exchanger,
discharge pipe)
[S92]: gas pipe thermistors
[S93]: liquid pipe thermistors
Pull out the clamp.
When reassembling, insert
each clamp of the
thermistors into one of the
holes as below.
When reassembling, insert
each clamp into the holes.
When reassembling, the
thermistor harness should
be placed between the
electrical box and the reactor
harness as below.
Step
Procedure Points
(R17398)
[S80]
Clamp
(R17397)
[S40]
[S90] [S92] [S93]
(R17399)
[S92]
[S93]
(R17401)
Reactor
harness
Thermistor
ASSY
(R17093)
Reactor harness
Thermistor
ASSY
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