Daikin 4MKD90BVM User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
8.0/9.0 kW Class
Outdoor Unit
Inverter
Multi Type
Si12-796

Service Manual
Removal Procedure
Outdoor Unit
zCooling Only zHeat Pump
4MKD90BVM 4MXD80BVMA
4MKD90BVMA
4MKD90BVMD

Si12-796
Removal Procedure 1
Table of Contents
1. Removal of Outer Panels ........................................................................2
2. Removal of Propeller Fans......................................................................5
3. Removal of Electrical Box .......................................................................6
4. Removal of PCB....................................................................................13
5. Removal of Fan Motor...........................................................................16
6. Removal of Electronic Expansion Valve and Thermistor ......................18
7. Removal of Sound Blanket and Reactor ...............................................19
8. Removal of Shunt..................................................................................21
9. Removal of Solenoid Valve and Four Way Valve .................................22
10.Removal of Compressor .......................................................................24
Note: The illustrations may be slightly different depending on the model.
The illustrations are for heat pump models as representative.

Removal of Outer Panels Si12-796
2Removal Procedure
1. Removal of Outer Panels
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
1External appearance.
Remove the piping in the
backward direction.
2Remove 11 screws of
the top panel.
Handle
(R2208)
Outdoor air
thermistor
Piping connection slot
(R2209)
(R2210)

Si12-796 Removal of Outer Panels
Removal Procedure 3
3Unscrew 3 screws of
the right panel, slide it
downwards and release
the tabs to remove.
4The figure shows the
view of piping
connections.
5Unscrew 1 screw of the
front right panel, slide it
downwards and release
the tabs to remove.
Step Procedure Points
Right panel
(Main unit side)
Tabs
(Right panel side)
(R2211)
PC board
for servicing
Servicing port
for gas pipe
Servicing port
for fluid pipe
C port
D port
A port
B port
Insects
stopper
shield
(R2212)
Front right panel
Tabs
(R2213)

Removal of Outer Panels Si12-796
4Removal Procedure
6Unscrew 3 screws of
the front panel to
remove.
7Remove 4 screws of
the discharge outlet
grille.
8Slide the discharge
outlet grille upwards
and release 6 tabs to
remove.
Step Procedure Points
(R2214)
(R2215)
Tabs
Tabs
(R2216)

Si12-796 Removal of Propeller Fans
Removal Procedure 5
2. Removal of Propeller Fans
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
Remove the discharge
outlet grille.
1To take off propeller
fan, remove the
washer-fitted nut M8.
2Remove the propeller
fan.
For reassembling, align the
mark of the propeller fan
with the D-cut section of
motor shaft.
Mount the propeller fan while
positioning the mark to
the top.
D cut
Washer-fitted nut M8
(R2217)
mark (R2218)

Removal of Electrical Box Si12-796
6Removal Procedure
3. Removal of Electrical Box
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
Remove the outer panels
such as top and front
panels.
Match the colors of the tie
wires to A, B, C and D ports
as follows.
(1) - Black Power
(2) - White Power
(3) - Red Transmission
Wires are fixed to the
terminal board with screws.
1The figure shows the
right side view.
1. Remove the tie wire.
1Loosen the terminal
board screws, and
remove the wires at A
and B ports.
2Open the terminal
board cover, and
remove the wires at C
and D ports.
When reassembling,
reconnect the wires to C and
D ports.
PC board for servicing
Power terminal board
(L) - White
(N) - Black
Earth terminal
screw
A port B port
D port
C port
Wiring fixture
(R2219)
(R2220)
Terminal
board
cover
(R2221)

Si12-796 Removal of Electrical Box
Removal Procedure 7
3Remove the earth wire.
4Remove 1 screw of the
terminal board.
5Release the tab on the
top right of the terminal
board.
6Pull out the terminal
board and open it.
Glass tube fuse and varistor
cannot be replaced
individually because lead-
free soldering is provided.
Step Procedure Points
(R2222)
(R2223)
(R2224)
Ta b
Glass tube fuse (Soldered)
Varister
(R2225)

Removal of Electrical Box Si12-796
8Removal Procedure
2. Remove each wire harness.
1Disconnect 4
connectors of the
electronic expansion
valve lead wires.
When reconnecting, make
sure to match the wire to the
correct connector.
2Remove the four way
valve connector [S80].
The cooling only models do
not have harness for [S80].
3Remove the connector
[S93] for liquid pipe
thermistor.
Step Procedure Points
[S20]
white
[S21]
red
[S22]
blue
[S23]
yellow
(R2226)
(R2227)
Connector Electronic
expansion
valve No.
Harness
length
[S20] (White) EVA 630
[S21] (Red) EVB 730
[S22] (Blue) EVC 825
[S23] (Yellow)
EVD 940
[S80]
(R2228)
[S93]
(R2229)

Si12-796 Removal of Electrical Box
Removal Procedure 9
4Remove the connector
[S92] for gas pipe
thermistor.
5Remove the connector
[S90] for thermistor.
Outdoor air
thermistor (Blue)
Discharge pipe
thermistor (Black)
Heat exchanger
thermistor (Gray)
6Remove the overload
relay connector [S40].
7Remove the reactor
lead wire.
Step Procedure Points
[S92]
(R2230)
[S90]
(R2231)
(R2232)
[S40]
Reactor
(R2233)

Removal of Electrical Box Si12-796
10 Removal Procedure
8Remove the relay
connector for
compressor.
9Remove the electrical
box cover.
10 Disconnect the fan
motor connector.
11 Remove the discharge
pipe thermistor.
Step Procedure Points
Relay connector
for compressor
(R2234)
Electrical box cover
(R3060)
[S70]
(R2236)
(R2237)

Si12-796 Removal of Electrical Box
Removal Procedure 11
12 Take off the thermistor
presser spring, and
remove the thermistor.
Place the thermistor so that
its end comes up to the end
of the presser spring.
Be careful not to lose the
presser spring for the
discharge pipe thermistor.
3. Remove the electrical
box.
1Remove 2 screws of
the electrical box.
2Turn the electrical box
up side down halfway,
and disconnect the
thermistor lead wire
from the hook.
Step Procedure Points
Thermistor presser spring
Discharge pipe
thermistor
(R2238)
Thermistor
Pipe Thermistor
presser
spring
(R2239)
Hook
(R2240)

Removal of Electrical Box Si12-796
12 Removal Procedure
3Remove the outdoor air
thermistor lead wire
from the groove.
4Remove each wire
harness, and dismount
the electrical box by
lifting it.
Step Procedure Points
(R2241)
Electrical box
(R3061)

Si12-796 Removal of PCB
Removal Procedure 13
4. Removal of PCB
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
1. Remove the controller
PCB.
1Release the tab of the
electrical box, and open
the terminal board.
2Disconnect each
connector of the
terminal board.
3Unscrew 1 screw and
release two tabs to
remove the PCB.
Ta b
(R2243)
(R2244)
Tabs
Base bar
(R2246)

Removal of PCB Si12-796
14 Removal Procedure
4Lift the PCB at the
terminal board side.
5Disconnect each wire
harness connector
linked to the inverter
PCB.
Step Procedure Points
(R2247)
(R2248)

Si12-796 Removal of PCB
Removal Procedure 15
6The figure shows the
controller PCB.
[S20]:Electronic expansion
valve coil A port
[S21]:Electronic expansion
valve coil B port
[S22]:Electronic expansion
valve coil C port
[S23]:Electronic expansion
valve coil D port
[S31]:To CN14 (Pin 9)
[S32]:To CN11 (Pin 5)
[S33]:To S34 (Pin 10)
[S40]:Overload relay
[S71]:To S72 (Pin 8)
[S80]:Four way valve coil
[S90]:Thermistor (Outdoor air,
heat exchanger, and
discharge pipe)
[S92]:Gas pipe thermistor
[S93]:Liquid pipe thermistor
2. Remove the service
monitor PCB.
1Remove the service
monitor PCB by
releasing its tab.
3. Remove the inverter PCB.
1Remove the 9 screws
of the inverter PCB.
Step Procedure Points
[S93]
[S80]
[S23]
[S22]
[S21]
[S20]
[S40]
[S31] [S71] [S33] [S32]
[S92] [S90]
Rectifier
stack
(R2249)
Service monitor
LED A
LED 1
LED 2
LED 3
LED 4
Ta b
Priority-room setting (SW4)
Wiring error check (SW3)
Forced operation (SW1)
Night quiet mode (SW5)
Cooling / heating mode lock
(SW2)
(R3062)
Fuse cover Glass tube fuse (3A)
(R2250)

Removal of Fan Motor Si12-796
16 Removal Procedure
5. Removal of Fan Motor
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
Remove the outer panels.
1Remove the fan motor
lead wire connector
[S70].
2Remove the propeller
fans.
For reassembling, align the
mark of the propeller fan
with the D-cut section of
motor shaft.
3Remove 2 screws of
the fan motor mount.
[S70]
(R2251)
Washer-fitted nut M8
(R2252)
(R2253)

Si12-796 Removal of Fan Motor
Removal Procedure 17
4Remove 4 screws of
the fan motor.
5Cut the wrapper fixing
the lead wire.
When reassembling, fix the
lead wire to avoid contact
with the propeller fan.
6Remove the fan motor. Mount the fan motor so as to
position the Qmark on the
top.
Step Procedure Points
(R2254)
(R2255)
(R2256)

Removal of Electronic Expansion Valve and Thermistor Si12-796
18 Removal Procedure
6. Removal of Electronic Expansion Valve and
Thermistor
Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work.
Step Procedure Points
1Remove each wire
harness.
Place the thermistor so that
its end comes up to the end
of the presser spring.
Be careful not to lose the
presser spring for the
discharge pipe thermistor.
2Take off the putty, and
remove each
thermistor.
S90:
Outdoor air thermistor (Blue)
Heat exchanger thermistor
(Gray)
Discharge pipe thermistor
(Black)
S92: Gas pipe thermistor
Room A (Black)
Room B (Gray)
Room C (Brown)
Room D (Red)
S93: Liquid pipe thermistor
Room A (Black)
Room B (Gray)
Room C (Yellow)
Room D (Blue)
3Remove the electronic
expansion valve coil.
(R2257)
Thermistor
Pipe Thermistor
presser
spring
(R2258)
(R2259)