Daikin 4MXL36TVJU User manual

REMOVAL
PROCEDURE
SERVICE MANUAL
Outdoor Unit
Inverter
Multi Type
36000/48000 Btu/h Class
Si121858E

Service Manual
Removal Procedure
Outdoor Unit
Heat Pump
4MXL36TVJU
5MXS48TVJU

Si121858E
Removal Procedure 1
Table of Contents
1. Outer Panels ...........................................................................................2
2. Outdoor Fan / Fan Motor.........................................................................5
3. PCB.........................................................................................................8
4. Thermistor ASSY / Electronic Expansion Valve Coil for
Bypass Circuit / Four Way Valve Coil ...................................................12
5. Electrical Box / Partition Plate / Sound Blankets...................................16
6. Gas / Liquid Pipe Thermistor ASSY ......................................................18
7. Electronic Expansion Valve...................................................................19
8. Four Way Valve / Electronic Expansion Valve for Bypass Circuit.........21
9. Compressor...........................................................................................23
Note: The illustrations may be slightly different depending on the model.

Outer Panels Si121858E
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 10 screws
and remove the top
panel.
2 Remove the 6 screws
and remove the right
side panel.
When reassembling, make
sure that the 2 hooks are
securely fastened.
3 Remove the screw and
remove the front panel
(2).
Top panel
(R25751)
Right side
panel
(R25752)
(R25753)
Front panel (2)
(R25754)

Si121858E Outer Panels
Removal Procedure 3
4 Remove the 8 screws
of the front panel (1).
5 Slide the fan motor
fixing frame to the left
and unfasten the 2
hooks.
6 Unfasten the hook and
remove the front panel
(1).
Step Procedure Points
Front
panel (1)
(R25755)
Hook
Fan motor fixing frame
(R25756)
Hook
(R25757)

Outer Panels Si121858E
4Removal Procedure
7 Remove the 4 screws
of the discharge grille.
8 Unfasten the 4 hooks
and remove the
discharge grille.
When reassembling, make
sure that the 4 hooks are
securely fastened.
Step Procedure Points
Discharge grille
(R25758)
Hook
Hook
(R25759)

Si121858E Outdoor Fan / Fan Motor
Removal Procedure 5
2. Outdoor Fan / 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. Remove the outdoor fan /
fan motor.
When reassembling, make
sure that the 2 hooks are
securely fastened.
Also, make sure not to
squash the harness.
1
2
Remove the 2 screws.
Slide upward and
remove the shield plate.
3
4
Disconnect the
connector [S70].
Cut the clamp.
[S70]: fan motor
5
6
Release the fan motor
lead wire from the 6
hooks and the groove.
Detach the wire clamp
material from the fan
motor lead wire.
When reassembling, wrap
around with the wire clamp
material 2 times or more
around the fan motor lead
wire at the position of the
clamp.
Shield plate
(R25760)
(R25761)
Clamp
[S70]
(R25762)
Wire clamp material Groove Hook
Hook
Fan motor
lead wire
(R25763)
(to fan motor)
(to main PCB)
Clamp Wire
clamp
material
(R25764)

Outdoor Fan / Fan Motor Si121858E
6Removal Procedure
7 Remove 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.
8 Remove the 4 screws
and remove the fan
motor.
When reassembling, put the
fan motor lead wire through
the hole of the fan motor
mounting plate so as not to
be entangled with the
outdoor fan.
Step Procedure Points
D-cut
Outdoor fan
Washer
Nut
Mark
(R25765)
13 mm
(1/2 inch)
(R18965)
Fan motor
(R25766)
Lead wire Outdoor fan
(R3249)

Si121858E Outdoor Fan / Fan Motor
Removal Procedure 7
2. Tips for removing the fan. Fan and fan motor can be
removed without removing
the front panel (1).
1
2
3
4
Remove the top panel
and front panel (2) and
the right side panel.
Remove the shield
plate.
Disconnect the
connector [S70] and
release the fan motor
lead wire.
Remove the screw, and
unfasten the 2 hooks of
the fan motor fixing
frame.
5
6
Remove the 2 screws
at the bottom from the
top.
Pull out the fan motor
fixing frame and
outdoor fan from the
top.
Use a long screwdriver or a
jig.
For easy access to the
bottom part, top part of the
fan motor fixing frame can
be removed by removing 4
screws.
Step Procedure Points
Hook
Fan motor fixing frame
(R25767)
(R25768)
(R25853)

PCB Si121858E
8Removal Procedure
3. PCB
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.
1 Remove the 3 screws
and open the refrigerant
pipe fixing cover.
2
3
Disconnect the
connectors for
electronic expansion
valves.
Disconnect the 3
connectors.
[S20](white): room A
[S21](red): room B
[S22](blue): room C
[S23](yellow): room D
[S24](white): room E (5-room
model only)
[S40]: overload protector
[S201], [S202]: service monitor
PCB
4 Disconnect the 4
connectors.
[S25](red): electronic expansion
valve for bypass
circuit
[S90]: thermistor ASSY
[S92]: gas pipe thermistors
[S93]: liquid pipe thermistors
Refrigerant
pipe fixing
cover
(R25769)
[S202]
[S201]
[S40]
[S20]
[S21]
[S22] [S23] [S24] (R25770)
[S93]
[S25]
[S90] [S92] (R25771)

Si121858E PCB
Removal Procedure 9
5
6
Disconnect the 5
connectors.
Remove the 2 screws
of terminal [HL1] and
[HN1].
[E1], [E2], [E3]: ground
[S], [S10]: to terminal block
[HL1], [HN1]: power supply
7
8
Disconnect the
connectors [S70] and
[S80].
Disconnect the relay
connector for
compressor.
[S70]: fan motor
[S80]: four way valve coil
9 Release the wires from
the 6 hooks.
10 Remove the 13 screws
and lift up the main
PCB.
When unscrewing, make
sure to support the PCB not
to drop.
Make sure not to deform the
refrigerant pipe.
Be careful the silicone
grease not to adhere the
peripheral.
Step Procedure Points
[E1]
[S10]
[S]
[HL1] [HN1] [E2] [E3]
(R25772)
Relay connector for compressor
[S70]
[S80]
(R25773)
Hook
Hook
(R25774)
(R25775)

PCB Si121858E
10 Removal Procedure
[E1], [E2], [E3]: ground
[HL1], [HN1]: power supply
[S], [S10]: to terminal block
[S20](white): room A
[S21](red): room B
[S22](blue): room C
[S23](yellow): room D
[S24](white): room E (5-room
model only)
[S25](red): electronic expansion
valve for bypass
circuit
[S40]: overload protector
[S70]: fan motor
[S80]: four way valve coil
[S90]: thermistor ASSY
[S92]: gas pipe thermistors
[S93]: liquid pipe thermistors
[S201], [S202]: service monitor
PCB
2. Remove the service
monitor PCB.
When reassembling, make
sure that the 2 hooks are
securely fastened.
1 Remove the 2 screws
and remove the shield
plate (right).
2 Remove the screw and
remove the switch
cover.
When reassembling, make
sure that the 2 hooks are
securely fastened.
Step Procedure Points
[E3][E2][HN1][HL1]
[E1]
[S10]
[S202]
[S201]
[S40]
[S21]
[S20]
[S93]
[S25] [S90] [S92]
[S22]
[S23][S24]
Main PCB
[S70]
[S80]
[S]
(R25776)
Shield plate (right)
(R25777)
(R25778)
Switch cover
(R25779)
Hook
(R22310)

Si121858E PCB
Removal Procedure 11
3 Unfasten the 4 hooks
and remove the service
monitor PCB cover.
When reassembling, make
sure that the 4 hooks are
securely fastened.
4
5
Disconnect the 2
connectors [S501] and
[S502] from the service
monitor PCB.
Detach the 4
projections and remove
the service monitor
PCB.
[S501], [S502]: to main PCB
Step Procedure Points
Service monitor PCB cover
(R25780)
(R22312)
Back view
Projection [S502]
[S501]
Service
monitor
PCB
Projection (R25781)

Thermistor ASSY / Electronic Expansion Valve Coil for Bypass Circuit / Four Way Valve Coil Si121858E
12 Removal Procedure
4. Thermistor ASSY / Electronic Expansion Valve
Coil for Bypass Circuit / Four Way Valve Coil
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 and power supply
wire.
To remove the thermistor
ASSY, rear plate has to be
removed. If the conduit
mounting plate can be
unhooked, the rear plate can
be removed without
removing connecting wires.
4-room model does not have
the terminal block for Room
E.
1 Remove the screws on
the terminal blocks,
earth/ground screws
and disconnect the 5
connecting wires
(Room A, B, C, D, E)
and power supply wire.
2 Loosen the lock nuts
and remove conduits
together with the 5
connecting wires
(Room A, B, C, D, E)
and the power supply
wire.
2. Remove the rear plate.
1 Remove the 9 screws.
Power
supply
Room E
Room D
Room C
Room B
Room A
Terminal block (R25782)
Lock nut
Lock nut
Conduit
Conduit
(R25783)
(R25784)

Si121858E Thermistor ASSY / Electronic Expansion Valve Coil for Bypass Circuit / Four Way Valve Coil
Removal Procedure 13
2
3
Slightly lift up the
conduit mounting plate
and unhook the 2
hooks.
Release the 2 hooks
and remove the rear
plate.
3. Remove the thermistor
ASSY.
1 Release the 2 hooks to
release the outdoor
temperature thermistor
holder.
2 Unfasten the 2 hooks to
open the holder and
pull out the outdoor
temperature thermistor.
3
4
Pull out the outdoor
temperature thermistor
through the hole.
Cut the 2 clamps and
pull out the outdoor
heat exchanger
thermistor.
Be careful not to lose the clip
for the thermistor.
Step Procedure Points
Hook
Rear plate
Conduit
mounting
plate
Hook
(R25785)
Hook
Holder
(R25786)
Hook
Hook
Outdoor temperature thermistor
(R17967)
Clamp
Outdoor
temperature
thermistor
Outdoor heat
exchanger
thermistor
(R25787)
(R3264)
Clip

Thermistor ASSY / Electronic Expansion Valve Coil for Bypass Circuit / Four Way Valve Coil Si121858E
14 Removal Procedure
5 Slightly open the sound
blanket (outer).
6 Detach the velcro tape
and release the
discharge pipe
thermistor lead wire.
7 Pull out the discharge
pipe thermistor.
Be careful not to lose the clip
for the thermistor.
Step Procedure Points
Sound blanket
(outer)
(R25788)
Discharge pipe
thermistor lead
wire
Velcro tape
(R25791)
Discharge pipe thermistor
(R25790)
Clip
(R25789)

Si121858E Thermistor ASSY / Electronic Expansion Valve Coil for Bypass Circuit / Four Way Valve Coil
Removal Procedure 15
8
9
10
Cut the 3 clamps.
(clamp A)
Pull out the 2 clamps.
(clamp B)
Detach the wires from
the hook and remove
the thermistor ASSY.
4. Remove the electronic
expansion valve coil for
bypass circuit.
1 Pull out the clamp and
remove the electronic
expansion valve coil for
bypass circuit.
5. Remove the four way
valve coil.
Insert a long screwdriver
from the hole near the
terminal blocks.
1 Remove the screw and
remove the four way
valve coil.
Step Procedure Points
Clamp B
Hook
Clamp A
(R25792)
Thermistor
ASSY
(R25793)
Clamp
Electronic expansion valve coil for bypass circuit
(R25794)
Four way valve coil
(R25795)
Hole
(R25796)

Electrical Box / Partition Plate / Sound Blankets Si121858E
16 Removal Procedure
5. Electrical Box / Partition Plate / Sound Blankets
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 electrical
box.
When reassembling, make
sure that the 3 hooks are
securely fastened.
1
2
3
Pull out the 3 clamps.
Remove the 4 screws.
Lift up and remove the
electrical box.
2. Remove the partition
plate.
When reassembling, fit the
hook on the partition plate to
the notch of the outdoor heat
exchanger plate.
1 Remove the 2 screws
and remove the
partition plate.
Clamp
Electrical box
(R25797)
Hook
Terminal block side
(R25798)
Hook
Outdoor fan side
(R25799)
Partition plate
(R25800)
Notch
Hook (R25801)

Si121858E Electrical Box / Partition Plate / Sound Blankets
Removal Procedure 17
3. Remove the sound
blankets.
1 Remove the sound
blanket (top).
2 Remove the sound
blanket (outer).
To remove the overload
protector, push the top of the
retainer and release the 2
hooks with a flat screwdriver.
The radiation sheet is
attached on the back of the
retainer of overload
protector. When replacing
the compressor, be sure to
replace the radiation sheet.
3 Put in the harness of
overload protector
through the window of
the sound blanket
(inner).
If the overload protector
needs to be replaced,
release the 2 hooks and
remove the overload
protector.
4 Remove the sound
blanket (inner).
Step Procedure Points
Sound blanket (top)
(R25802)
Sound blanket (outer)
(R25803)
Retainer
Overload
protector
(R25805)
Radiation
sheet
(R25806)
Hook
Overload
protector
(R25804)
Sound
blanket
(inner)
(R25807)

Gas / Liquid Pipe Thermistor ASSY Si121858E
18 Removal Procedure
6. Gas / Liquid Pipe Thermistor ASSY
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 gas pipe
thermistors ASSY.
4-room model has 4 gas
pipe thermistors.
The number of the gas pipe
thermistors varies depending
on the model.
Be careful not to lose the clip
of the thermistor.
1
2
Cut the 5 clamps.
Pull out the 5 gas pipe
thermistors and remove
the gas pipe thermistor
ASSY.
2. Remove the liquid pipe
thermistor ASSY.
4-room model has 4 liquid
pipe thermistors.
1 Remove the putties.
2 Pull out the 5 liquid pipe
thermistors and remove
the liquid pipe
thermistor ASSY.
The number of the liquid
pipe thermistors varies
depending on the model.
Be careful not to lose the
fixture for the thermistor.
Clamp
(behind)
(R25808)
Clamp Gas pipe
thermistor
(R25809)
Clip
(R22332)
Putty
(R25810)
Liquid pipe
thermistor
(R25811)
Fixture
(R25854)