Daikin 4MKS80ESG User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Multi Type
8.0/9.0/10.0 kW Class
Si121292EC

Service Manual
Removal Procedure
Outdoor Unit
zCooling Only zHeat Pump
4MKS80ESG 4MXS80KVM
4MXS100KVM
4MKS80FSG
4MXS80LVMA
4MKS80KVM 4MXS80LVMA9
4MKS100KVM
4MXS80E3V3B
4MKS80LVMA 5MXS90E3V3B
4MKS80LVMA9

Si121292EC
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Electrical Box ..........................................................................................6
3. PCBs .....................................................................................................11
4. Fan Motor..............................................................................................14
5. Coils / Thermistors ................................................................................15
6. Sound Blankets .....................................................................................18
7. Compressor...........................................................................................19
Note: The illustrations may be slightly different depending on the model.
The illustrations are for heat pump models as representative.

Outer Panels Si121292EC
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
1. Remove the suction grille.
1
2
Unfasten the 5 hooks.
Remove the suction
grille.
2. Remove the top panel.
1
2
Remove the 8 screws.
Lift the top panel and
remove it.
3. Remove the right side
panel.
1Remove the 5 screws.
(R17585)
Hook
Hook
Suction grille
(R18781)
Top panel
(R17071)
Right side panel

Si121292EC Outer Panels
Removal Procedure 3
2Remove the right side
panel.
Slide the right side panel
downward to unfasten the 2
hooks on the rear side.
4. Remove the front panel
(2).
+: This screw is M5(3) × 16
Slide the front panel (2)
downward to unfasten the
hook.
1Remove the 2 screws
and remove the front
panel (2).
5. Remove the front panel
(1).
Remove the discharge grille
and the outdoor fan before
removing the front panel (1).
1
2
Remove the 4 screws
on the discharge grille.
Unfasten the 2 hooks at
the top and remove the
discharge grille.
Step Procedure Points
(R18911)
Hook
Front Panel (2)
+
Hook
(R18782)
(R18784)
Discharge grille
Front
Panel (1)
Hook

Outer Panels Si121292EC
4Removal Procedure
3Remove the nut and
remove the outdoor fan.
Nut size : M8
When reassembling, align
the mark of the outdoor
fan with the D-cut section of
the motor shaft.
4Remove the 5 screws.
5Release the hook and
remove the front panel
(1).
6. Remove the rear panel. Disconnect the connecting
wires and power supply
wires.
1Remove the screw on
the partition plate (2).
2Slide the partition plate
(2) to the left and
remove it.
Step Procedure Points
Outdoor fan
(R16736)
13 mm
(0.51 inch)
(R18965)
(R18785)
(R17716)
(R17801)
Rear panel
Partition plate (2)
LN
Room A Room B Power supply
Room C Room D
44
44
4P
(R17903)

Si121292EC Outer Panels
Removal Procedure 5
3Remove the 5 screws
on the wire fixture
(upper).
4Remove the wire fixture
(upper).
5Remove the 3 screws
on the wire fixture
(lower).
6Remove the wire fixture
(lower).
7Release the holder and
harness of the outdoor
temperature thermistor.
8Remove the 5 screws.
9Unfasten the 2 hooks
and remove the rear
panel.
Step Procedure Points
(R17902)
Wire fixture
(upper)
(R17936)
Wire fixture
(lower)
Holder
(R17717)
Outdoor
temperature
thermistor
Hook
(R17718)

Electrical Box Si121292EC
6Removal Procedure
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
1Remove the 2 screws
to detach the earth /
ground wires.
2Disconnect the
connector [S70].
[S70]: fan motor
3Release the fan motor
lead wire from the 5
hooks.
+: When reassembling, do not
use these 2 hooks.
(R20764)
Earth /
ground
wire
[S70]
(R10397)
(R17268)
Fan motor lead wire
+

Si121292EC Electrical Box
Removal Procedure 7
4Disconnect the
connector [S80] and
pull out the clamp.
[S80]: four way valve coil
The cooling only models
have no harness for [S80].
5Disconnect the 4
connectors for the
electronic expansion
valve coil and pull out
the clamp.
[S20] (white): room A
[S21] (red): room B
[S22] (blue): room C
[S23] (yellow): room D
5-room models also have
[S24] (green) for room E.
When reassembling, insert
each clamp into the hole.
6Disconnect the
connector [S93] and
pull out the clamp.
[S93]: liquid pipe thermistor
Step Procedure Points
[S80]
Clamp
(R11187)
[S20] [S21] [S22] [S23]
Clamp
(R20765)
For the electronic
expansion valve coil
For [S93]
(R17904)
Clamp
[S93]
(R10400)

Electrical Box Si121292EC
8Removal Procedure
7Disconnect the
connector [S92] and
pull out the clamp.
[S92]: gas pipe thermistor
When reassembling, insert
the clamp into the hole.
8Disconnect the
connector [S90] and
pull out the clamp.
[S90]: thermistor ASSY
When reassembling, insert
the clamp into the hole.
9
10
Release the thermistor
harness from the hook
at the bottom of
electrical box.
Pull out the clamp of the
thermistor harness from
the hole of the electrical
box.
Step Procedure Points
[S92]
(R10537)
Clamp
For [S92]
(R17905)
[S90]
Clamp
(R10538)
For thermistor ASSY
(R17906)
Clamp
Hook
(R6420)
Fixing position for the
thermistor harness
When reassembling, insert
the clamp into the hole.

Si121292EC Electrical Box
Removal Procedure 9
11 Disconnect the
connector [S40].
[S40]: overload protector
12
13
Release the clamp.
Disconnect the relay
connector for the
compressor.
14 Remove the screw on
the stop valve mounting
plate.
Step Procedure Points
[S40]
(R10539)
(R20766)
Clamp
(R10395)
Electrical box
Stop valve
mounting plate

Electrical Box Si121292EC
10 Removal Procedure
15 Remove the screw on
the partition plate (1).
16
17
Unfasten the hook.
Remove the electrical
box.
Step Procedure Points
(R6411)
Partition plate (1)
Hook (R17579)

Si121292EC PCBs
Removal Procedure 11
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 main PCB.
1Remove the cover of
the electrical box.
Release the 4 hooks. The
hooks are marked with W.
2Remove the 3 screws.
3Unfasten the 4 hooks.
4Lift up the main PCB.
5Disconnect the
connectors from the
main PCB.
6Remove the main PCB.
Hook
Hook
(R18783)
Main PCB
Cover
(R6427)
(R10405)
(R17907)

PCBs Si121292EC
12 Removal Procedure
2. Remove the reactor.
1Remove the screw.
2Remove the 3 screws
and remove the reactor.
3. Remove the service
monitor PCB.
1Disconnect the
connectors [S52]
[S102] from the service
monitor PCB.
2Unfasten the top and
bottom hooks and
remove the service
monitor PCB.
Step Procedure Points
(R10409)
Reactor
(R6434)
(R10410)
[S102]
[S52]
Service
monitor PCB
(R17803)
Hook

Si121292EC PCBs
Removal Procedure 13
4. Remove the terminal
board.
1Remove the screw.
2Unfasten the hook.
3Remove the terminal
board.
Step Procedure Points
(R17804)
Terminal board
Hook
(R10413)

Fan Motor Si121292EC
14 Removal Procedure
4. Fan Motor
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1
2
Remove the 2 lower
screws first.
Then, remove the 2
upper screws.
Be sure to remove the lower
screws (1) first. If the top
screws (2) are removed first,
the fan motor may tilt down
or fall and cause injury
because its center of gravity
is shifted to the front.
3 Remove the fan motor. When reassembling, make
sure that the wire harness is
facing downward.
(2)
(1)
(R6442)
Fan motor
(R6443)
Harness
(R6444)

Si121292EC Coils / Thermistors
Removal Procedure 15
5. Coils / Thermistors
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 electronic
expansion valve coils.
1Pull out the electronic
expansion valve coils.
2. Remove the thermistors.
When reassembling, place
the thermistor so that its
edge comes up to the edge
of the fixture.
Be careful not to lose the
fixtures for the thermistors.
1Pull out the gas pipe
thermistors.
Electronic
expansion
valve coil
(R10415)
Gas pipe
thermistor
(R17412)
(R18786)
Fixture
Gas pipe
thermistor

Coils / Thermistors Si121292EC
16 Removal Procedure
2Peel off the putty and
pull out the liquid pipe
thermistors.
Be careful not to lose the
clips for the thermistors.
3Pull out the outdoor
heat exchanger
thermistor.
Be careful not to lose the
clip.
4Slightly open the sound
blanket (outer).
Step Procedure Points
Liquid
pipe
thermistor
(R17413)
(R6450)
Liquid pipe
thermistor
Clip
(R17805)
Outdoor heat exchanger thermistor
Clip
Clip
(R5619)
(R10418)
Sound blanket (outer)

Si121292EC Coils / Thermistors
Removal Procedure 17
5Remove the sound
blanket (top upper).
6Remove the discharge
pipe thermistor.
Place the thermistor so that
its end comes up to the end
of the fixture.
Be careful not to lose the
fixture for the discharge pipe
thermistor.
3. Remove the four way
valve coil.
The cooling only models
have no four way valve coil.
1Remove the screw.
2Remove the four way
valve coil.
Step Procedure Points
(R10419)
Sound blanket (top upper)
(R10420)
Discharge pipe thermistor
Fixture
(R10536)
Pipe
Thermistor
Four way
valve coil
(R18787)

Sound Blankets Si121292EC
18 Removal Procedure
6. Sound Blankets
Warning Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step Procedure Points
1Open the sound blanket
(outer).
2Remove the sound
blanket (top upper).
3Remove the screw from
the partition plate (1)
and push the plate to
the left slightly for easy
work.
4Remove the sound
blanket (outer).
5Remove the sound
blanket (top lower).
6Remove the sound
blanket (inner).
The sound blanket is fragile.
Be careful of the notches of
the compressor mount (3
locations).
(R18788)
Sound blanket (top upper)
Sound
blanket
(outer)
(R17807)
Sound blanket (outer)
Partition plate (1)
(R18912)
Sound blanket (top lower)
(R17908)
Sound blanket
(inner)